Stress Triggering and Earthquake & Volcano Deformation Group (Menlo Park, California)

We study how one earthquake or volcanic event sets up the next by the transfer of stress, and we measure how earthquakes and volcanoes deform the earth's surface.

Abstract: The long recorded history of earthquakes in Japan affords an opportunity to forecast seismic shaking exclusively from past shaking. We calculate the timeaveraged (Poisson) probability of severe shaking by using more than 10,000 intensity observations recorded since AD 1600 in a 350-km-wide box centered on Tokyo. Unlike other hazard assessment methods, source and site effects are included without modeling, and we do not need to know the size or location of any earthquake or the location and slip rate of any fault. The two key assumptions are that the slope of the observed frequency-intensity relation at every site is the same; and that the 400-year record is long enough to encompass the full range of seismic behavior. Tests we conduct here suggest that both assumptions are sound. The resulting 30-year probability of IJMA≥6 shaking (~PGA≥0.9 g or MMI≥IX) is 30-40% in Tokyo, Kawasaki, and Yokohama, and 10-15% in Chiba and Tsukuba. This result means that there is a 30% chance that 4 million people will be subjected to IJMA≥6 shaking during an average 30-year period. We also produce exceedance maps of peak ground acceleration for building code regulations, and calculate short-term hazard associated with a hypothetical catastrophe bond. Our results resemble an independent assessment developed from conventional seismic hazard analysis for greater Tokyo.

Chan, Chung-Han, and Ross S. Stein,

Stress evolution following the 1999 Chi-Chi, Taiwan, earthquake: Consequences for afterslip, relaxation, aftershocks, and departures from Omori decay, Geophys. J. Int., (2009) doi: 10.1111/j.1365-246X.2008.04069.x
[Contact us for printable article: han@gfz-potsdam.de rstein@usgs.gov]

Thompson, G. A., and T. Parsons,

Can footwall unloading explain late Cenozoic uplift of the Sierra Nevada crest?, International Geology Review, v. 51, p. 986-993, DOI:10.1080/00206810903059156
[Printable article (0.3 Mb)]