HR: 1340h
AN: S43A-1042    [Abstracts]
TI: Hypocenter Relocations of Earthquakes in Central Southern Korea using the Double- Difference Method
AU: * Choi, M
EM: lune411@snu.ac.kr
AF: School of Earth and Environmental Sciences, Seoul National University, Sillim-dong, Gwanak-gu, Seoul, 151-747, Korea, Republic of
AU: Baag, C
EM: baagce@snu.ac.kr
AF: School of Earth and Environmental Sciences, Seoul National University, Sillim-dong, Gwanak-gu, Seoul, 151-747, Korea, Republic of
AU: Rhie, J
EM: rhie@snu.ac.kr
AF: School of Earth and Environmental Sciences, Seoul National University, Sillim-dong, Gwanak-gu, Seoul, 151-747, Korea, Republic of
AB: The double-difference method is widely used for precise relocations of earthquakes to estimate the extent and attitude of seismogenic faults. In South Korea, it is very difficult to find the location and estimate the extent of seismogenic faults because large earthquakes are rare. Therefore, we applied the double-difference method to small earthquakes occurred in Central Southern Korea and try to find any evidence of well-defined fault planes. Latitude and longitude of earthquakes range from 35ĒŠN to 37ĒŠN and from 127ĒŠE to 129ĒŠE, respectively. The seismicity of this region is relatively higher and density of seismic stations is also higher than other regions in South Korea. We used 65 events in the magnitude (ML) 1.9-3.9 range occurred for the period from February 2001 to October 2007 in this region. We obtained the travel time data from 14 broad band and 42 short period seismic stations deployed by two Korean agencies, such as Korea Meteorological Administration (KMA) and Korea Institute of Geoscience and Mineral Resources (KIGAM). We determined P-wave travel times using manual phase picking and also travel time differences among P phases recorded at common station using waveform cross-correlation. The distribution of the earthquake relocations will be compared to the possible fault planes, which are constrained by regional moment tensor solutions.
DE: 7200 SEISMOLOGY
DE: 7215 Earthquake source observations (1240)
DE: 7230 Seismicity and tectonics (1207, 1217, 1240, 1242)
DE: 7294 Seismic instruments and networks (0935, 3025)
SC: Seismology [S]
MN: 2007 Fall Meeting