HR: 0800h
AN: S51B-0505    [Abstracts]
TI: Source-Parameter Estimation for the Earthquakes using Full Newton Method in Frequency Domain
AU: * Yoo, S
EM: monday7@snu.ac.kr
AF: School of Earth and Environmental Science, Seoul National University, San 56-1, Sillim- dong, Gwanak-gu, Seoul, 151-742, Korea, Republic of
AU: Shin, C
EM: css@model.snu.ac.kr
AF: Department of Energy System Engineering, Seoul National University, San 56-1, Sillim- dong, Gwanak-gu, Seoul, 151-742, Korea, Republic of
AU: Rhie, J
EM: rhie@snu.ac.kr
AF: School of Earth and Environmental Science, Seoul National University, San 56-1, Sillim- dong, Gwanak-gu, Seoul, 151-742, Korea, Republic of
AB: We have developed a new algorithm for estimation of the earthquake source-parameters using the full Newton method in the frequency domain. In exploration seismology, it is well known that estimation of the source time function in the frequency domain is efficient. In this study, we modified the method to estimate the source time function and also focal mechanism of earthquakes. To verify whether the method is working, we tested the method using synthetic waveforms for hypothetical earthquakes. Here synthetics are computed by 3D FEM code. Our synthetic tests show that the new method can successfully invert waveforms for the exact source time functions and focal mechanisms. We are planning to apply this method to real earthquakes in LA region, of which source parameters are well defined from other studies. For Green's function computation SCEC high-resolution 3D velocity model is used. To reduce the possible error coming from un-modeled 3D structure, constant phase shift terms will be corrected in the frequency domain By doing this we will test the possibility to estimate the source time functions for relatively small earthquakes.
DE: 0560 Numerical solutions (4255)
DE: 3260 Inverse theory
DE: 3285 Wave propagation (0689, 2487, 4275, 4455, 6934)
DE: 7215 Earthquake source observations (1240)
DE: 7290 Computational seismology
SC: Seismology [S]
MN: 2007 Fall Meeting