Posts tagged earthquake

New Zealand Christchurch Earthquake Location map

Christchurch Earthquake Case Study 2011

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New Zealand Christchurch Earthquake Location map

New Zealand Christchurch Earthquake Location map

Following the 7.0 on the Richter Scale earthquake of 2010, Christchurch, in New Zealand didn’t expect to receive a second significant earthquake within the space of a year.

WHERE?

At a depth of 5km (focus) of the earthquake occurred  2km west of the town of Lytteltonvery close to Christchurch, the second most populated city  in New Zealand with a population of 390,300. See google map here.

christchurch 2011 earthquake location

Christchurch 2011 earthquake location

WHEN?

Tuesday, February 22, 2011 at 12:51:43 PM at epicentre.

HOW STRONG?

Magnitude 6.3 on the Richter scale. See the USGS info here

The 2010 Christchurch despite being a higher order of magnitude earthquake at 7.1 on the Richter scale happened in the early hours of the morning at 4.35am which explains partly why there were no casualties as the central business district would have been empty with few people in high rise buildings.

CAUSES

The earthquake was part of the aftershock sequence of the M 7.0 September 3, 2010 Darfield, earthquake in New Zealand.

Thrust Fault

Thrust Fault

There is a thrust fault which is linked with the plate boundary between the Pacific and Australian plates which meets in the centre of South Island, New Zealand.

New Zealand plate tectonic map

New Zealand plate tectonic map

EFFECTS

  • 181 dead (as of 3 May 2011)
  • 80% of the city had no electricity
  • Water supplies and sewage disposal badly disrupted
  • Road and bridges damaged
  • Liquefaction of the ground (solid ground is shaken so much that water rises quickly up and turns the ground into a liquid state
  • Many historic buildings damaged or destroyed
  • People trapped in rubble (this story really was interesting as I listened to her on the radio talking from her mobile phone whilst trapped under the rubble)


Sink holes and liquefaction on the roads  in Christchurch, New Zealand. 

RESPONSES

Short Term

  • In the seconds, hours and days after the earthquake rescue and response was offered by ordinary people as well as the emergency services on duty
  • An emergency meeting Government Cabinet Meeting was held at 3pm. Read more here
  • The Canterbury Art Gallery which had been designed to be earthquake proof survived and was turned into a Emergency Response centre.  Read more here
  • Satellite Imagery was provided for emergency teams to help with allocation of aid and rescue from the US and France. See more here
  • 300 Australian police were flown in brining the number of the police to 1200
  • The police provided security cordons, organised evacuations, supported search and rescue teams, missing persons and family liaison, and organised media briefings and tours of the affected areas.

Medium Term

  • The Red Cross provided grants to families with children under 5 years of age who were living in significantly damaged homes caused by the September or February earthquakes, with their electricity bills. Read more here
  • The police coordinated forensic analysis and evidence gathering of fatalities  working closely with pathologists, forensic dentists and scientists.

Long Term

 

REFERENCES

impact-crater.jpg

A tour of impact craters on Google Earth

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The largest verified impact crater on Earth, Vredefort Crater in South Africa. Measuring a staggering 250 – 300 km (155 – 186 miles) across, this crater was formed over 2 billion years ago by an asteroid estimated 10 km (6 miles) in size.

Google Sightseeing is a great blog which in its own words states ‘ why bother seeing the world for real’ when you can use Google Earth!  Well I guess it helps reduce the impact to the environment as a consequence of flying to these locations.

Anyway this blog posting has a great range of impact craters to explore

The Haiti Earthquake

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Some incredible if disturbing images of Haiti from the Boston Globe.  The pictures of residents sleeping in the street and the images of some of the shattered neighbourhoods begin to put a sense of scale on things.  But do we feel increasingly detached looking through the window of the internet at these scenes as we become desensitised to suffering. 

Six days later the situation had improved slightly.  

This article in the Guardian is good at explaining the differences between the neighbouring Dominican Republic and Haiti in particular focusing on the issue of deforestation.  Haiti is 98% deforested!.

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