Canterbury), New Zealand Earthquake of September 4, 2010
EERI Special Earthquake Report — November 2010 Learning from Earthquakes The Mw 7.1 Darfield (Canterbury), New Zealand Earthquake of September 4, 2010 From September 8th to 20th, 2010, at 4:36 am, as well as to the moder- magnitude at 7.1 with a predomi- a team organized by the Earth- ate level of shaking in the most popu- nantly strike-slip focal mechanism quake Engineering Research Insti- lated areas of the Canterbury region. having a right-lateral focal plane tute (EERI) and the Pacific Earth- New Zealand also benefits from a striking east-west. However, more quake Engineering Research modern structural code and rigorous detailed and ongoing analysis has (PEER) Center investigated the code enforcement. Regional planning revealed a strong reverse faulting effects of the Darfield earthquake. had been undertaken to reduce criti- component to the mainshock. The team was led by Mary Comerio, cal infrastructure and lifelines vulner- The surface rupture spans nearly UC Berkeley, and included Lucy ability to natural hazards about 15 30 km and consists of fault scarps Arendt, University of Wisconsin, years ago (Centre for Advanced Engi- that locally exceed 4 m of right- Green Bay; Michel Bruneau, Uni- neering, 1997), with improvements in lateral and about 1 m of vertical versity of Buffalo, New York; local government and utilities pre- dislocation of the ground surface. Peter Dusicka, Portland State Uni- paredness, as well as the retrofitting In most places along and near the versity; Henri Gavin, Duke Univer- of bridges and other lifeline facilities. fault, the ground surface on the sity; Charles Roeder, University of Christchurch is the largest city on the south side has been raised relative Washington; and Fred Turner, Cali- South Island of New Zealand, and to the north side.
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