수신함수분석법을 이용한 황해의 지각구조

Abstract

Korean peninsula consists of Precambrian tectonic blocks (Nangrim, Gyeonggi, and Yeongnam massifs) that are bounded by fold belts (Imjingang Belt and Ogcheon Fold Belt). A recent review of the tectonic evolution in the Korean Peninsula suggests that the Imjingang Belt represent the collision zone between the North China Block and the South China Block in the early Triassic. Later, a collision along the Ogcheon Fold Belt took place in the Jurassic to constitute the major tectonic framework of the Korean Peninsula. A controversial hypothesis, however, suggests that the Ogcheon Fold Belt form in the early Paleozoic as a boundary between the North China Block and the South China Block. Hypotheses on the tectonic history of the Korean Peninsula have focused on the location of the suture zone between the North China Block and the South China Block. Most hypotheses are proposed based on the observations of surface geology. Yellow sea is located in the center of controversial hypotheses, although no clear evidences have been found from the Yellow Sea. Scientists from Korea and China teamed up to resolve the long standing question of tectonic history of the region. 11 temporary broadband seismic stations are installed around the Yellow Sea to monitor seismicity in the region and to collect teleseismic waveform data. Receiver function technique is applied to the collected data to define 1-D representative crust and upper-mantle velocity models beneath the broadband seismic stations. 1-D velocity models are compared to identify any correlations between China and Korea. We present the preliminary results of the China-Korea international collaboration in the Yellow Sea area.