HR: 10:50h
AN: U22A-02    [Abstracts]
TI: Constraining Slip Histories of Recent Great Earthquakes Using Broadband Waveforms of Global Seismic Network
AU: * Ji, C
EM: ji@geol.ucsb.edu
AF: Department of Earth Science, University of California, Santa Barbara, CA 93106 United States
AB: We have developed a new inverse method which constrains the slip history of large earthquakes by combined inverting teleseismic body waves and long period surface waves. These two datasets are mutually complementary in the studies of earthquake sources. The long period surface waves could robustly constrain the general parameters of ruptures, such as seismic moment, but are lack of resolution for the detailed rupture process. In contrast, the relative high frequency teleseismic body waves are sensitive to the detailed rupture process but could not well resolve the total seismic moment when the rupture duration is long, presumably due to the interference with the free surface. Combining these two datasets together could improve the data coverage in frequency domain. By carefully choosing time windows, we have also been able to use more seismic body phases in source study, which improves the spatial data coverage. Here, the along-strike and downdip resolutions of this new method are evaluated using a check-box model similar to the fault geometry of the 2004 great Sumatran-Andanman island earthquake. Seven great earthquakes (Mw>8) since 1990 will be revisited too.
DE: 7200 SEISMOLOGY
SC: Union [U]
MN: Fall Meeting 2005