1998•Journal of the Korean earth science societyRequires access

Seismic Source Study of Local and Regional Earthquakes in and near Korea Using Moment Tensor Inversion

So-Gu Kim, Nadeja Kraeva

Abstract

The purpose of this investigation is to determine source parameters such as focal mechanism, seismic moment, and source depth from recent shallow-focus earthquakes ('94∼'96) with sparse coverage in and near the Korean Peninsula. The moment tensor inversion method (TDMT_INV) is used to find the source mechanism. The focal solution for the Youngwol earthquake of December 13, 1996, is found to be a right-lateral strike slip with strike NE, and the Kyongju earthquake of June 25, 1997, is found to be a thrust fault with slight left-lateral in SE directions. The solution of the Neftegorsk earthquake in Sakhalin on May 27, 199s is also determined as a right-lateral strike-slip with 83° dip and NE strike.

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Key concepts: Focal mechanism, Seismology, Moment tensor, Geology, Seismic moment, Inversion (geology), Slip (aerodynamics), Thrust fault