Computer Science
Scientific paper
Jan 2002
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002e%26psl.195...17o&link_type=abstract
Earth and Planetary Science Letters, Volume 195, Issue 1-2, p. 17-27.
Computer Science
1
Scientific paper
We study the cumulative change of the coseismic, crustal gravitational energy caused by earthquakes occurring in two regions with active tectonics: the western USA during 1992 to 1999, and Japan during January 1997 to August 2000. We use regional earthquake source mechanism catalogues available for these regions in order to increase spatial coverage and resolution. The catalogues, however, contain very shallow earthquakes for which the conventional normal mode approach has difficulties in calculating the gravitational energy change under slow convergence in the mode summations. To overcome this problem, we employ a `direct' solution approach which allows to generate very accurate kernels for the integration of the coseismic gravitational energy change. In the western USA, the Coast Ranges and the Transverse Ranges show systematically positive gravitational energy changes while the margin of the Basin and Range shows negative changes. In Japan, the northeastern part shows predominantly positive changes while the southwestern part shows negative to weak positive changes. These systematic patterns well correspond to the regional tectonic regime: gravitational energy gain for compressional tectonics and energy loss for extensional tectonics. The total (global), cumulative crustal gravitational energy change caused by the earthquakes occurring in the western USA is +6.1×1017 J, and it is +2.7×1017 J by the earthquakes in Japan. These energy changes are positive in both regions which indicates the predominance of the compressional stress state with respect to the earthquake occurrence.
Okamoto Taro
Tanimoto Toshiro
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