HR: 1340h
AN: S23B-1389    [Abstracts]
TI: 3-D Local Tomography for the Shallow Crustal Structure of the Gyeongsang Basin in the Southeastern Korean Peninsula
AU: * Park, J
EM: jhpark@kigam.re.kr
AF: Earthquake Research Center, Korea Institute of Geoscience and Mineral Resources, Deajeon, 305-350, Korea, Republic of
AU: Moon, W M
EM: wmoon@eos1.snu.ac.kr
AF: Geophysics, The University of Manitoba, Winnipeg, MB Canada and also with, Research Institute of Oceanography (RIO), School of Earth and Environmental Sciences (SEES), Seoul National University, Seoul, 151-742, Korea, Republic of
AU: Baag, C
EM: baagce@snu.ac.kr
AF: School of Earth and Environmental Sciences, Seoul National University, Seoul, 151-742, Korea, Republic of
AB: The seismic activities around the Korean Peninsula is much lower than other active areas such as Japanese Islands and the digital seismic stations in South Korea have been operated only for a relatively short period of less than 12 years. Due to limited availability of seismic data, it has been difficult to construct a 3-D tomography around the Korean Peninsula several years ago. We applied 3-D tomographic inversion in this paper to determine the velocity structure at the Gyeongsang Basin in the southeastern part of Korean Peninsula with 3,034 P-wave arrivals from 534 events selected from KIGAM(Korea Institute of Geoscience and Mineral Resources) earthquake catalogs. The initial velocity model is generated by combining KIGAM 1-D model and IASPEI91 model. Using SIMULPS, 3-D velocity inversion and epicenter relocation are carried out simultaneously. The results of the P-wave velocity distribution show that low velocity zones correspond to the location of cretaceous sedimentary layer at the shallow part of Gyeongsang Basin. The distribution of high velocity zones agrees well with locations where cretaceous granitoid basement rocks intrude and outcrop.
DE: 6982 Tomography and imaging (7270, 8180)
DE: 7270 Tomography (6982, 8180)
DE: 8180 Tomography (6982, 7270)
SC: Seismology [S]
MN: 2007 Fall Meeting