IISEE's CMTs, Aftershock Distributions, Fault planes, and Rupture processes for large earthquakes in the world (1994-2004)

Details IISEE's CMTs, Aftershock Distributions, Fault planes, and Rupture processes for large earthquakes in the world (1994-2004) IISEE's CMTs, Aftershock Distributions, Fault planes, and Rupture processes for large earthquakes in the world (1994-2004)

Dec 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008agufm.s43d1910h&link_type=abstract

American Geophysical Union, Fall Meeting 2008, abstract #S43D-1910

Mathematics

Logic

7200 Seismology, 7215 Earthquake Source Observations (1240)

Scientific paper

The IISEE started a project to determine the following earthquake information for large (Mw>=7.2) earthquakes in the world between 1994 and October, 2004 by the analytical techniques developed by the IISEE staff members and visiting researchers: centroid moment tensors, aftershock distributions, corresponding fault planes, and rupture processes. Centroid moment tensors are determined analyzing long period body wave data recorded at GSN (Global Seismological Network) stations by the grid search approach by Hara (Hara, 2004, Earth Planets Space, 56, 307-310; Hara, 2005, Earth Planets Space, 57, 179-183). Aftershocks including mainshock and foreshocks are relocated using P-wave arrivals from International Seismological Centre (ISC) CD-ROMs by the modified joint hypocenter determination method (MJHD. Hurukawa and Imoto, 1992, Geophys. J. Int., 109, 639-652; Hurukawa, 1995, Geophys. Res. Lett., 22, 3159- 3162; Hurukawa, Popa, and Radulian, 2008, Earth Planets Space, 60, 565-572). Then, the corresponding fault plane is determined based on the obtained aftershock distribution (nodal planes are taken from the Global CMT catalog). Earthquake rupture processes are determined analyzing broadband waveform data recorded at GSN (Global Seismological Network) stations following Yagi and Fukahata (2008, Geophys. J. Int. in press), who developed a waveform inversion technique considering covariance components in analyses of densely sampled observed data. In addition, we developed software to perform strong ground motion simulation for seismic bedrock using stochastic Green"fs function method, and performed simulations for some damaging earthquakes. We have made a database consisting of the above earthquake information and other information such as the Global CMT catalog, and have developed a web interface by which the above database can be searched, displayed and compared. We are going to make this interface open to public in September, 2008. We plan to continuously update this database. Also, we plan to perform further analyses. The one is multiple CMT analyses based on the technique of Hara (1997, Geophys. J. Int., 130, 251-256). The other is waveform inversion for rupture process using highly accurate synthetic seismograms computed by a newly developed finite difference method (Mizutani et al., 2008, General assembly of Asian Seismological Commission, abstract) with consideration of complex 3-D structure in source regions.

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