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3-D P-wave Velocity Structure in South Korea using Seismic Tomography  

박재우 (연세대학교 지구시스템과학과)
민경덕 (연세대학교 지구시스템과학과)
전정수 (한국지질자원연구원 지진연구센터)
제일영 (한국지질자원연구원 지진연구센터)
Publication Information
Economic and Environmental Geology / v.35, no.5, 2002 , pp. 445-454 More about this Journal
Abstract
3-D P-wave velocity model in the southern Korean Peninsula is investigated by using the earthquake tomography method. This velocity model would be used to locate the exact hypocenter position, and also useful for our understanding of the crustal structure. The simultaneous inversion is used to get the minimum 1-D model and hypo-center relocation, which are used as an initial 3-D velocity model. The velocities in the minimum 1-D model are 6.04 km/s, 6.45 km/s, and 7.78 km/s between the depth of 0-19 km, 19-32 km, and 32-55 km respectively. In the 3-D P-wave velocity model, Layer 1 (0~3 km) has high velocities in Kyongsang basin, Yonglam massif, and Okchon folded belt, and low velocities in Kyonggi massif. In layer 2 (3~19 km) high velocities are predominent around Kyonsang basin and Yongnam massif except Yonil basin, but low velocities exist around Kyonggi massif and Okchon folded belt. In Laye. 3 (19~32 km) high velocities prevail throughout the southern part of Korean Peninsula, but low velocity does throughout the middle except SNU, YIN station in Konggi massif. In Layer 4 (32 km), the maximum velocity is showed in the middle and southwestern part, while the minimum velocity in the southeastern and coastal area. The depth of the velocity boundary corresponds to the crustal structure of the southern Korean Peninsula which is calculated by gravity data.
Keywords
Velocity structure; Simultaneous inversion; Minimum 1-D model; Seismic tomography;
Citations & Related Records
Times Cited By KSCI : 1  (Citation Analysis)
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