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Seismic Velocity Structure in the Central Korean Peninsula Using the Artificial Explosions
Kim, So Gu,Lee, Seoung Kyu 한국지진연구소 1996 SAFE Vol.2 No.1
The seismic experiments were carried out from April 24 to April 27, 1996 in order to investigate seismic velocity structures beneath the central parts(Samchok-Mt. Yongmoon) of the Korean peninsula. Three explosions were fired and seismic waves generated by them were observed at over 28 records. As part of this study, a 130㎞-long seismic profile was recorded along the parallel to east-west line with a mobile type seismograph PDAS-100. The purpose of experiment is to investigate the seismic velocity structures of this study area(Samchok-Mt. Yongmoon). We have selected three events, twenty eight records to analyze Pg, Sg, PcrP, PmP phases, which are the direct waves(Pg, Sg) in the upper granitic layer and the reflected waves(PcrP; Conrad reflection, PmP: Moho reflection) from the Conrad and the Moho discontinuity, respectively. We concentrate on attention on the three layer model of the Conrad discontinuity at granitic/basaltic interface, and the Moho discontinuity at basaltic/upper mantle interface. Using the selected phases, we determined apparent velocities, which are 5.78 ㎞/sec for Pg phase, 6.75 ㎞/sec for PcrP, 7.98 ㎞/sec for PmP, and 3.44 ㎞/sec for Sg, respectively. We used Ray method to calculate theoretical travel times for Pg, PcrP, PmP, and Sg phases. From the result of raytracing, we can calculate the seismic velocity structure, the thickness of upper crust(granitic layer) is 18 ±0.5㎞ with velocity that range from 5.76 to 6.02 ㎞/sec using Pg, PcrP, and Sg phases , and the thickness of lower crust(basaltic layer) is 16 ±0.3 ㎞ with velocity that range from 6.30 to 6.76 ㎞/sec using PmP phase.