Aftershock risks such as those demonstrated by the recent events in New Zealand and Japan

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Recent earthquakes in New Zealand and Japan show that it is important to consider the spatial and temporal distribution of aftershocks following large magnitude events since the probability of high intensity ground motions from aftershocks, which are capable of causing significant societal impact, can be considerable. This is due to the fact that a mainshock will have many aftershocks, some of which may occur closer to populated areas and may be large enough to cause damage. When a large magnitude event strikes a region, the chance that aftershocks will cause damage can be significant as was observed after the 2011 Tohoku and 2010 Canterbury earthquakes (e.g., damage caused by Mw6.6 April 11, 2011 Fukushima-Hamadori earthquake following Tohoku earthquake or by Mw6.3 February 22, 2011 Christchurch earthquake following Canterbury earthquake). Aftershock events may further damage already damaged buildings, thereby further complicating assessments of risk to the built environment. In this paper, the issue of aftershock risk is addressed by summarizing current research regarding: (1) aftershock hazard, (2) structural fragility/vulnerability before and after the mainshock, and (3) change in risk due to aftershocks.

Additional publication details

Publication type Conference Paper
Publication Subtype Conference Paper
Title Aftershock risks such as those demonstrated by the recent events in New Zealand and Japan
Year Published 2014
Language English
Publisher Earthquake Engineering Research Institute
Contributing office(s) Geologic Hazards Science Center
Description 11 p.
Conference Title Tenth U.S. National Conference on Earthquake Engineering
Conference Location Anchorage, Alaska
Conference Date July 21-25, 2014
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