Canterbury Earthquake

11.4.11

April 11,2011 update

Public Information Update: 1700 hours Monday 11 April 2011

Chemical toilet distribution during the weekend
1200 chemical toilets were handed out from pick-up locations in six of the eastern suburbs on Saturday to residents in those suburbs who missed the initial delivery.
Residents in the chemical toilet distribution areas who have not received a chemical toilet or are having trouble operating their chemical toilet should call 03 941-8999.
Chemical toilet additives
There are no issues with using the additives supplied with chemical toilets.
Due to the tiny amounts involved, there is no effect at the Christchurch Wastewater Treatment Plant. The concentration of the active ingredients (sulfamic acid and bronopol) in the products is well within international limits.
These additives pose no greater risk to public health than other astringent cleaning products in homes, which, if used with care, are not hazardous. As with all household cleaning products, it is recommended that these additives be kept out of the reach of children.
The additives should be disposed of in the tanks provided – not in portaloos, gardens, existing toilets or any other receptacle, because this is good health practice and doesn’t stress the sewerage system.
Do not remove placards
Only Civil Defence can remove placards from buildings. While a State of Emergency is in place, placards must remain on display.
If a building has a yellow or red placard, a detailed engineering evaluation is required before placard status can be reviewed. (Building owners should contact EQC for advice in engaging a Chartered Professional Structural Engineer.)
If after engaging a Chartered Professional Structural Engineer the owner has carried out work, the yellow or red placard must stay in place until a Civil Defence reassessment has been made.
A reassessment can be arranged by sending the engineer’s report to cdrescue@ccc.govt.nz. A Civil Defence engineer will visit the building to make the reassessment and may recommend to have placard status changed.
Reduction of cordons Zone 4 North and Zone 7A
Accessing Montreal Street in Zone 4 – Drivers entering Montreal Street north of the Arts Centre are reminded that there is no left turn from Bealey Avenue into Montreal – this is a one-way system north. However, it is possible to turn left from Bealey Avenue down Victoria Street, and then left into Montreal Street.
Zone 7A – Chester Street East, Madras Street, Barbadoes Street and Oxford Terrace was opened to residents and business owners today, and will be open to the public from 8am tomorrow [Tuesday 12 April]. Military checkpoints will remain in place after 7A Zone has opened to the public to ensure there is no unauthorised entry into Zones 6, 7 and the Red Zone.

Car washes are starting again

Civil Defence is allowing car washes to operate again in some areas – this is because 80 per cent of water used in this process is recycled, and relatively little water is used, making car washing operations extremely efficient. Residents are asked to conserve water as this reduces pressure on the wastewater network and reduces demand on the water supply network.

Voting in the upcoming election

Christchurch residents who have moved will still be able to vote in the General Election later this year, regardless of where they are now living.
The Electoral Enrolment Centre has put together a flyer to help advise those who have been affected by the earthquake. The flyer is available on http://www.elections.org.nz/enrolment/cantabrians-you-can-still-have-your-say.html
REMINDERS
Boil water notice lifted across the city:
  • The Canterbury District Health Board is satisfied that Christchurch tap water is now safe to drink without boiling.
  • The boil water notice has been lifted across all suburbs in Christchurch, Lyttelton and Banks Peninsula.
Roading – 30kph speed limits introduced in eastern suburbs:
  • Reduced speed limits are being introduced on earthquake damaged roads in Christchurch’s eastern suburbs to prevent further deterioration and allow for repairs
  • Police will be enforcing the new 30kph speed limits in: Avondale, Avonside, Burwood, Clifton/Richmond Hill, Dallington, Ferrymead, Horseshoe Lake, New Brighton, North New Brighton, Parklands, Richmond, St Andrews/Mt Pleasant/Balmoral Hill, Sumner, Waimari Beach/Northshore.
Road Closure – Evans Pass Road:
  • Evans Pass Road is closed this week to allow blasting, and placement and removal of rockfall-arresting containers.
  • The road is closed as follows: Tuesday 12 April to Thursday 14 April: intermittent closures up to 2 hours, between 8am – 5pm; Friday 15 April: 8.30am to 5.00pm.

Water and Wastewater advice for property owners in cordon reduction areas

Water supply has been restored to all zones in the cordoned area, excluding the Red Zone.
Some properties have had their water shut off at the valve in the street, which means it may appear that they have no water. However, water can be restored by:
Step 1: turning on the valve in the street outside the premises,
Step 2: run your outside tap for five minutes to clear any sand in the line, then
Step 3: run water from the highest tap in the property (if possible) to remove any air that could be locked within your pipes,
Step 4: clear old water from all lines in your property and/or premises. Do this before using any water.
You should also:
  • Check hot water cylinders are flushed and full before restoring power to the cylinders. Any air locks on the cylinders could cause heating elements to burn out. Your plumber must check this for you.
  • If you have sprinklers in your building please ensure a registered fire company inspects and tests the sprinkler system before reoccupying. This is to check for leaks in the system that could cause further damage or the system to malfunction.
  • Industrial premises are advised to check all water lines before reinstating pressure to the lines. These lines should be run to a drain to clear any sand or old water sitting in the lines.
  • Check for water leaks. If there are any water leaks within your property it should be repaired by a plumber or drain layer. The Council will fix leaks on public properties and road. Call (03) 941 8999. You can isolate the supply by closing the valve in the street outside your property.
Once water is back on: people can use showers, dishwashers and washing machines (‘grey water functions’). They are asked to check that this wastewater is draining away properly.
Wastewater (Sewer)
It is possible to test whether your property’s wastewater system is operational.
Please test your sewer system by flushing a toilet or running a tap. Water should run freely through your drain – if it does not then a drain layer may be required to unblock the pipes that connect to the sewer.
If you are outside the suburbs where chemical toilets and disposal tanks have been distributed and your toilet is flushing and draining away, you can use it sparingly. However, check that it isn’t draining onto your or your neighbour’s property. If it is, contact a drain layer.

Operation Hold Fast

Royal New Zealand Engineers are making their way around the Red Zone – checking the security of buildings damaged by the 22 February earthquake.
The purpose of Operation Hold Fast is to ensure the security of businesses. Business owners who return to find their building boarded up are asked to collect keys from Civil Defence for safe entry into their premises.
Led by Lieutenant Mike Clulow, members of 3 Field Troop from Burnham including carpenters, plumbers, electricians and field engineers – all highly experienced in working in tough environments such as Afghanistan and East Timor, are now ensuring the security of more than 400 buildings in the city’s Red Zone.
“This is the first time the New Zealand Army has been involved in a project of this kind in New Zealand,” he says.
“We have over 30 personnel including carpenters, plumbers, electricians, plant operators and field engineers working to secure potentially more than 400 buildings in the central city.”
“We have found each building comes with it’s own unique challenges. Some are partially collapsed and we’re working in conditions that include heavy dust and debris, rotting food contamination, and there is always the risk of the buildings themselves.”
“Each building requires a unique approach in securing the premises and we have improvised where necessary. Our team has utilized multiple methods and a variety of materials including more than 100 metres of razor wire, 300 sheets of plywood, two kilometres of timber and more than 200 padlocks and latches.” Lt Clulow said.
“In some instances we have built false walls where total frontages had disappeared or erected high razor wire to protect upper levels.”
“Operation Hold Fast has allowed us to secure many buildings from the elements and ensure the safety of both buildings and contents in support for the New Zealand public.”
Operation Hold Fast will be working throughout the central city and the red zone this week up to Friday 15 April.
Business owners with approved access to their premises and who find their premises boarded up are asked to collect keys from Civil Defence’s E.O.C at the Art Gallery. All keys are to held at the cordon management office and will be available to business owners with appropriate identification.

Boil water notice lifted

Effective immediately, the boil water notice has been lifted across all suburbs in Christchurch, Lyttelton, and Banks Peninsula. You do not have to boil or treat drinking water any more. However, your water supply may still be chlorinated.

Media Advisory 5:00 pm, Friday 8th April: Public Information Update

Boil water notice lifted across the city

The Medical Officer of Health is satisfied that Christchurch tap water is now safe to drink without boiling. The boil water notice has been lifted across all suburbs in Christchurch, Lyttelton and Banks Peninsula.
Despite the lifting of the notice people should still conserve water. The Christchurch water supply and waste water infrastructure is still fragile and we need to avoid putting undue pressure on it.
The Christchurch City Council will continue sampling to ensure that water remains safe to drink.
The Canterbury District Health Board plans to remove the chlorine from the Christchurch water supply as soon as it is safe and practical to do so.
People returning to their houses or business premises for the first time since the boil water notice has been lifted should turn on all the taps and let them run for a minimum of five minutes. If after five minutes the water is still discoloured, they should continue to run the taps until the water is clear.

Roading – 30kph speed limits introduced in eastern suburbs

Reduced speed limits are being introduced on earthquake damaged roads in Christchurch’s eastern suburbs to prevent further deterioration and allow for repairs.
Police will be enforcing the new 30kph speed limits in the following areas: Avondale, Avonside, Burwood, Clifton/Richmond Hill, Dallington, Ferrymead, Horseshoe Lake, New Brighton, North New Brighton, Parklands, Richmond, St Andrews/Mt Pleasant/Balmoral Hill, Sumner, Waimari Beach/Northshore.
The reduced speed limit will remain in place until the roads have been repaired.

Road Closure – Evans Pass Road

It is likely road closures will be in place on Evans Pass Road next week to allow blasting, and placement and removal of rockfall-arresting containers.
  • Monday 11 April and Friday 15 April: 8.30am to 5.00pm.
  • Tuesday 12 April to Thursday 14 April: intermittent closures up to 2 hours, between 8am – 5pm.
Vehicles, cyclists and pedestrians will not be allowed to use Evans Pass Road during the closures.

Chemical toilets

More chemical toilets will be delivered to eleven specified pick-up locations in some eastern suburbs this Saturday 9 April between 8:30 am and 11:30 am. Residents will need to bring proof of address and identity, e.g. a power bill and drivers licence.
Instructions on how to use the chemical toilet will come with it.
The chemical toilets are being delivered to the following locations for pick up:

Dallington

  • Corner Achilles and Bampton Streets
  • Corner McBratneys Road and Fleete Street
  • Corner New Brighton Road and Queensbury Street

Avondale

  • Corner Avondale and Breezes Roads (at Breezes Rd shopping centre)
  • Corner New Brighton Road and Baker Street

Wainoni

  • Corner Wainoni Road and Orrick Crescent

Aranui

  • Corner Pages and Breezes Roads (on Breezes Rd, south side of intersection)
  • Corner Carisbrooke and Soberton Streets

North New Brighton

  • Corner Bower Avenue and Sandy Road

New Brighton

  • Corner Seaview Road Hawke St and Shaw Avenue (opposite fire station)

South New Brighton

  • 128 Rockinghorse Road
Please check this page to make sure of locations, which could change due to recovery work.

Reduction of cordons Zone 4 North and Zone 7A

Zone 4 North, encompassing Bealey Avenue, Salisbury Street, Montreal Street and Park Terrace, will open to residents and business owners from 8am on Sunday 10 April and to the public from 8am on Monday 11 April.
Zone 7A, encompassing Chester Street East, Madras Street, Barbados Street and Oxford Terrace, will open to residents and business owners on Monday 11 April and to the public from 8am on Tuesday 12 April.
This will help with access for residents who live in the Avonside Loop and will enable businesses with approved, safe buildings to operate.
Military checkpoints will remain in place after 7A Zone has opened to the public to ensure there is no unauthorised entry into Zones 6, 7 and the Red Zone.
Further cordon charges around Zone 7 are expected early next week.

Time capsules to be opened by Mayor Bob Parker

Following the earthquake two time capsules (one glass and one sealed copper tube) were discovered beneath the Godley Statue in Cathedral Square.
A third time capsule (sealed tin box) has been unearthed in the old Civic Building on Manchester Street. All time capsules are in the care of Canterbury Museum.
Mayor Bob Parker will open the two sealed time capsules at Canterbury Museum on Tuesday 12 April at 2.00pm. Media are invited to attend.

Community briefings

There are no community briefings this weekend. Community briefings will be held the following weekend. Full details are on this page.

Seismic reflection survey for Brighton Beach

Seismic reflection equipment is currently being used along New Brighton Beach from south end of Rocking Horse Road to the New Brighton Pier.
The purpose of this work is to determine the structure of the ground below.
The seismic unit is working above the high tide level on the beach on Saturday 9 April and possibly into Sunday 10 April depending on progress.
Once the survey along New Brighton Beach is completed the unit will be moving inland to run a similar survey within the CBD.

Red Cross Hardship grants close on Monday

Red Cross hardship grants close on Monday 11 April, 5pm.
Residents can apply at Canterbury’s Red Cross Head Office at 34 Birmingham Drive, open 9am to 5pm Monday (closed over the weekend) or at any of their eight Recovery Assistance Centres, open until midday Saturday.
Forms can be downloaded from www.redcross.org.nz or from any open WINZ office.
The Red Cross is considering the next round of grants and hope to have information next week.
Call 0800 754 726 for more details.

GeoNet – Home CANTERBURY QUAKES/TSUNAMIS/VOLCANO/LANDSLIDE

GeoNet – Home

6.3.11

Community-run Hubs

There are several community-run hubs around Christchurch. They are initiated by residents to help their communities. These are mostly self-sufficient with some having people staying overnight and others where only food is available. Some function only as a social agency.
1. Aranui Primary School,
257 Breezes Road
2. Ashburton & Methven
Ashburton Community Link Centre, Cnr Moore & Cass Street
3. Diamond Harbour
In church beside fire station
4. Governors Bay School
Jetty Road
5. Mosque
Deans Avenue
6. Mount Pleasant School
82 Major Hornbrook Rd
7. Opawa Baptist Church
285 Wilsons Rd
8. Rapaki Marae
37 Rapaki Drive
9. Roy Stokes Hall
146 Seaview Rd
10. Rehua Marae
79 Springfield Rd
11. Rewi Alley at Wharenui
Wharenui School, 32A Matipo St
12. South Brighton School
166 Estuary Rd
13. Sumner School
Colenso St
14. Tuahiwi Marae
291 Tuahiwi Rd

4.3.11

Multiple Language Support For Canterbury Earthquake

FAQ for More info, click here

FAQ – updated 8:55 am, Tuesday 1 March 2011
Quick list
A quick list of resources and information for people affected by the Canterbury earthquake, translated into a number of languages.

AMAZING MAP>>>Christchurch earthquake: before and after

ABC News - Christchurch earthquake: before and after

27.2.11

Information and resources - Christchurch earthquake - NZ Herald

Information and resources - Christchurch earthquake - NZ Herald

Lost and found pets -trademe.co.nz

Lost and found pets - category on trademe.co.nz

NEW ZEALAND QUAKE LINKS

NEW ZEALAND QUAKE LINKS

New Christchurch to rise after earthquake | Stuff.co.nz

New Christchurch to rise after earthquake | Stuff.co.nz

Christchurch Recovery Map

Christchurch Recovery Map

Latest Information for the Deaf Community of Christchurch

Video Update 25th february 2011 http://www.youtube.com/watch?v=WdiptS4KqxU

23.2.11

How you can help the good folks of New Zealand from your home/no cost, just time

New Zealand has been hit by an event so severe that it has triggered something that used to be thought of as a theoretical possibility. A state of national emergency has been declared for the first time. We have several international USAR/US&R teams providing support. However, the city’s infrastructure is in a terrible state.
If you would like to keep in touch with developments - here are some links:
http://webchat.freenode.net channel #eqnz
http://wiki.crisiscommons.org/CrisisCampNZ
If you would like to monitor local & international news to add to http://eq.org.nz, I would appreciate it. I’m coordinating an Ushahidi instance. We have sufficient volunteers approving incoming reports. However, we would be greatful if people could read through news/TV articles and add facts to:
http://eq.org.nz/reports/submit
This instance has received pro-bono support from several major players, including Catalyst IT, Ko-ordinates, Google’s Sydney office, Vodafone, Telecom NZ, 2degrees, Victoria University of Wellington and Optimal Usability. We need to make sure that we have sufficient information over the next few weeks to keep the site sustainable. Your monitoring is vital to ensuring that Christchurch citizens have the information they need to stay healthy and recover.
Tim McNamara
CrisisCampNZ
http://www.timmcnamara.co.nz
http://twitter.com/timClicks

Radio New Zealand : News : Canterbury Earthquake : Mobile cellphone sites to boost coverage

Radio New Zealand : News : Canterbury Earthquake : Mobile cellphone sites to boost coverage

Earthquake : 220 major-trauma patients treated at hospital

Radio New Zealand : News : Canterbury Earthquake : 220 major-trauma patients treated at hospital

Radio New Zealand : News : Canterbury Earthquake : 'Disgusting' quake emails target people eager to donate

Radio New Zealand : News : Canterbury Earthquake : 'Disgusting' quake emails target people eager to donate

22.2.11

Emergency Helpline 0800 77 9997 - For missing people call Red Cross 0800 733 276 #eqnz #christchurch

Via Google Christchurch Response Page

Resources

Info4 the deaf and hearing impaired

Christchurch Earthquake

2/22 Video Update #1 http://www.youtube.com/watch?v=tj60URjKR3E


Play video Christchurch Earthquake 8th Update Presented by: Daniel Harborne [43.41 MB]
Play video Christchurch Earthquake 7th Update Presented by: Daniel Harborne [24.15 MB] Play video Christchurch Earthquake 6th Update Presented by: Victoria Skorikova [38.81 MB]
Play video Christchurch Earthquake 5th Update Presented by: Daniel Harborne [19.44 MB] Play video Christchurch Earthquake Fourth Update B Presented by: Catherine Greenwood [37.38 MB]
Play video Christchurch Earthquake Fourth Update A Presented by: Catherine Greenwood [49.39 MB] Play video Christchurch Earthquake Third Update Presented by: Catherine Greenwood [22.19 MB]
Play video Christchurch Earthquake Second Update
  Presented by: Catherine Greenwood [25.07 MB]

For continuing coverage see the website please 

Christchurch Earthquake

Christchurch Earthquake

New Zealand Red Cross Update and links

Welcome to the website of New Zealand Red Cross. In New Zealand and across the globe, Red Cross provides assistance to millions of vulnerable people every year. We help people affected by conflict, disaster and emergency and prepare communities to cope with potential crises.
canterbury earthquake - feb 23 update 0030 hrsA 6.3 magnitude earthquake hit the Canterbury area at 12.51pm today - February 22. The quake, approximately 5km underground and located 10km south east of the city has caused wide spread damage, bursting sewage lines, damaging buildings and homes, cutting power and telephone lines to many areas of the city. The mayor of Christchurch, Bob Parker, has declared a state of emergency.Red Cross Christchurch and Timaru teams are on the ground working now, with Nelson and Blenheim teams on their way. Dunedin, Queenstown, Invercargill and West Coast teams are all due to arrive tomorrow morning to assist. We are working with Civil Defence, New Zealand Police, the local councils and agencies and are assisting with First Aid to the injured and provision of welfare. Standardised Red Cross relief supplies being distributed and deployed from around the country.
NZRC is not currently requiring or accepting donations of goods or volunteers at this time. NZRC are currently focusing on roles supporting the CDEM response. Urgent email enquiries can be referred to our National Emergency Operating Centre at nzrceoc@redcross.org.nz .
For welfare related enquiries and requirements for affected persons please call the Government help line on 0800 7799977
For information on the Earthquake response see http://canterburyearthquake.org.nz/
To lodge an enquiry in relation to missing relatives please call the NZ Red Cross National Enquiry Centre on 0800 REDCROSS (0800 733 276) (note this line may be overloaded) International calls can be made to +64 7 8502199
International restoring family links enquiries from Red Cross or Red Crescent national societies can be sent tofamilylinks@redcross.org.nz  further information will be pending.

21.2.11

EqnzContact - Tuhura

EqnzContact - Tuhura

NZ's top 3 news sites

http://www.nbr.co.nz
http://nzherald.co.nz
http://stuff.co.nz

The Christchurch earthquake told on Social Media Platforms

http://socialmedianz.com/opinion2/2011/02/22/the-christchurch-earthquake-told-on-social-media-platforms/

Where to donate blood in NZ

If you're able to donate blood, here are the locations of NZblood:

New Zealand's nationwide database for lost and found pets + pets for adoption. For dogs, cats and all pets.

New Zealand's nationwide database for lost and found pets + pets for adoption. For dogs, cats and all pets.

Tweak the Tweet Map for Christchurch EQ

Tweak the Tweet Map

Lost/found pets in New Zealand

Lost/found can be listed on national dbase

Live feeds for New Zealand

If you're at work or can't get to a TV, here are the live feeds:
This came from here Thanks for the links!

New Zealand Civil Defense



Civil defence website with updates http://www.civildefence.govt.nz/memwebsite.nsf or follow @nzcivildefence #eqnz

Googles People finder in operation for New Zealand


Deaths in Christchurch quake

Did you feel the quake?

Photo / BezzeraEspresso
EXPAND

Photo / BezzeraEspresso

There have been "multiple fatalities" after a shallow 6.3 magnitude earthquake in Christchurch this afternoon caused buildings to collapse, police have confirmed.
Police said fatalities had been reported at several locations and that two buses had been crushed by falling buildings.

Deaths, destruction in Christchurch quake:

LATEST: A number of people are dead and scores trapped after a large quake struck Christchurch this afternoon.
Police said two buses had been crushed by falling debris, while witnesses said screams could be heard coming from the Pyne Gould Business building where up to 150 people were feared trapped.
The airport was closed to all but emergency flights after its tower had collapsed and Lyttelton tunnel was shut. Christchurch Hospital remained open but was also damaged.
Christchurch Cathedral, the heart of the city, has largely collapsed.
Power was out in 80 percent of the city, as large aftershocks continued.

Where you can go to Monitor Earthquakes

Monitoring

Earthquake Data Available from the NEIC

18.2.11

What is a ShakeMap

Earthquakes

WHAT'S A SHAKEMAP?   A ShakeMap is a representation of ground shaking produced by an earthquake. 
 
(Click on the image for a larger view.)
 
 

State Geologists Put California Earthquake Maps Online

Alquist-Priolo Earthquake Fault Zone MapsThe index map below identifies all Official Maps of Earthquake Fault Zones delineated by the California Geological Survey through December 2010 under the Alquist-Priolo Earthquake Fault Zoning Act. Individual Earthquake Fault Zone Maps can be viewed on screen. Digital image files (pdf) and Geographic Information System files (GIS) of individual maps can be downloaded by selecting a specific quadrangle map.
Click here for a quick tutorial. Contact us for any questions/comments.

You can select the affected city/county from the drop down list, or enter the property's street address to view the appropriate Earthquake Fault Zone Map.  MAP

Mid-Continent Earthquakes May Migrate from Fault to Fault

Most of the world's earthquakes occur along the boundaries between Earth's constantly moving tectonic plates, like the San Andreas Fault in California. Small quakes along these faults are expected to occur relatively frequently, until they build up to the next big one. However, earthquakes that occur in the middle of continents, such as China's 2008 quake that killed around 70,000 people, seem to occur out of nowhere.
Now, new research from the University of Missouri suggests that inner-continental quakes such as China's may abide by a different set of rules than those that occur along plate boundaries.
Along plate boundaries, small and moderate earthquakes that rupture along a particular fault lead to a build-up of stress along that same fault line, but mid-continent faults are connected to each other in a complex network, and a large earthquake along one fault will instead put pressure on a different fault.
Mian Liu, a geologist from the University of Missouri, and his team studied data from large earthquakes — 6.5 or higher on the Richter scale — that occurred in inner-continental China over the last 2,000 years. Surprisingly, they found that the same fault segment had never ruptured more than once. Instead, the earthquakes migrated throughout the region.
"It's like a game of whack the mole. The mole doesn't come through the same hole twice," Liu told OurAmazingPlanet.
When the team analyzed the locations of the quakes and the energy each released, they found that the data indicated that the earthquakes were not migrating randomly. Instead, the faults seem to be mechanically coupled to each other, so that when one fault segment is ruptured, the energy is passed along to another fault segment, stressing it until it ruptures.
Liu said the new theory is not yet able to predict when or where the next big earthquake will occur along inner-continental fault systems, but he said it is a new way of thinking about mid-continent earthquakes. For instance, a large earthquake occurred in the New Madrid fault system in Missouri in 1811, the largest-known earthquake in the mid-continental United States. Because of that, the fault system has been the subject of much research, but Liu's theory suggests that the next big earthquake in the United States will occur along a separate fault.
The work shows that applying hazard models to continental interior fault systems that have been designed for plate boundaries is likely to be inadequate, said Eric Calais, a geophysicist at Purdue University, who is also a scientific adviser helping revamp a disaster preparedness plan for Haiti.
"When it comes to earthquakes in plate interiors, one truly has to think out of the box and be able — and willing — to abandon plate boundary concepts," he said.

13 Crazy Earthquake Facts


Date: 09 March 2010 Time: 05:15 AM ET

-IMAGEALT-
Ground view of collapsed building and burned area at Beach and Divisadero Streets in the Marina District of San Francisco after the 1989 Loma Prieta earthquake.
C.E. Meyer, U.S. Geological Survey



1. Earth has been more seismologically active in the past 15 years or so, says Stephen S. Gao, a geophysicist at Missouri University of Science & Technology. Not all seismologist agree, however. 

2. San Francisco is moving toward Los Angeles at the rate of about 2 inches per year — the same pace as the growth of your fingernails — as the two sides of the San Andreas fault slip past one another. The cities will meet in several million years. However, this north-south movement also means that despite fears, California won't fall into the sea.

3. March is not earthquake month, despite what some people believe. True, on March 28, 1964, Prince William Sound, Alaska, experienced a 9.2 magnitude event — one of the biggest ever. It killed 125 people and caused $311 million in property damages. And on March 9, 1957, the Andreanof Islands, Alaska, felt a 9.1 temblor. But the next three biggest U.S. earthquakes occurred in February, November, and December. The devastating major earthquake in Chile of 2010 struck on Feb. 27. And the huge 9.3 temblor that spawned the devastating Indian Ocean tsunami in 2004 occurred on Dec. 26.

4. There are about 500,000 earthquakes a year around the world, as detected by sensitive instruments. About 100,000 of those can be felt, and 100 or so cause damage each year. Each year the southern California area alone experiences about 10,000 earthquakes, most of them not felt by people.

5. The sun and moon cause tremors. It's long been known that they create tides in the planet's crust, very minor versions of ocean tides. Now researchers say the tug of the sun and moon on the San Andreas Fault stimulates tremors deep underground.

6. A city in Chile moved 10 feet in the massive 8.8 magnitude earthquake Feb. 27, 2010. The rip in Earth's crust shifted the city of Concepción that much to the west. The quake is also thought to have changed the planet's rotation slightly and shortened Earth's day.

7. There's no such thing as "earthquake weather." Statistically, there is an equal distribution of earthquakes in cold weather, hot weather, rainy weather, and so on, according to the U.S. Geological Survey. Scientists say there is no physical way that weather could affect the forces several miles beneath the surface of the earth where quakes originate. The changes in barometric pressure in the atmosphere are very small compared to the forces in the crust, and the effect of the barometric pressure does not reach beneath the soil.

8. Earth's bulge was trimmed a little by the 2004 Indonesian earthquake, the 9.0+ temblor that generated the deadly tsunami on Dec. 26 that year. Earth's midsection bulges in relation to the measurement from pole-to-pole, and the catastrophic land displacement caused a small reduction in the bulge, making the planet more round. 

9. The Pacific Ring of Fire is the most geologically active region of Earth. It circles the Pacific Ocean, touching the coasts North and South America, Japan, China and Russia. It's where the majority of Earth's major quakes occur as major plate boundaries collide. 

10. Oil extraction can cause minor earthquakes. These are not the quakes you read about. Rather, because oil generally is found in soft and squishy sediment, when oil is removed other rock moves in to fill the void, creating "mini-seismic events" that are not noticeable to humans. 

11. The largest earthquake ever recorded was a magnitude 9.5 in Chile on May 22, 1960. 

12. Quakes on one side of Earth can shake the other side. Seismologists studying the massive 2004 earthquake that triggered killer tsunamis throughout the Indian Ocean found that the quake had weakened at least a portion of California's famed San Andreas Fault. The Chilean quake of 1960 shook the entire Earth for many days, a phenomenon called oscillation that was measured by seismic stations around the planet. 

13. The deadliest earthquake ever struck January 23, 1556 in Shansi, China. Some 830,000 are estimated to have died.

Eartthquakes Mean Business