Application of Moment Tensor Inversion to Small Local Earthquakes in the Korean Peninsula

Abstract

The purpose of application of moment tensor inversion method is to determine source parameters, such as, focal mechnism, seismic moment and source depth. This paper presents result of focal mechnism solutions of 14 recent events with magnitudes ranging from M3.3 to M4.8 by using moment tensor inversion method called TDMT_INV. The strike of faults is in the direction of NE-SW and NW-SE with the movement of strike-slip or strike slip of minor reverse component. The compressional axis of the stress field id predominatly E - W or ENS-WSW except for some faults, which are distributed at Ryongnam Massif and Wonsan, they have a compressional axis of N-S or NNW-SSE.