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Focal mechanism solutions in the central and western areas of the Korean Peninsula (36-37.8 o N, 126-128 o E) were obtained from the analysis of the recent seventeen earthquakes (M≥2.2) which occurred from January, 2005 to May, 2010. The spatial differences between the epicenters recalculated by this study and those announced by the Korea Meteorological Administration are less than 0.03 o , indicating a small deviation. Focal mechanism solutions were obtained from the analysis of P wave polarities, SH wave polarities and SH/P amplitude ratios. The focal mechanism solutions show dominant strike-slip faulting or oblique slip faulting with strike-slip components. The P-axes trends are mainly ENE- WSW or E-W directions. The direction of fault plane and auxillary fault plane with NNE-SSW and WNW-ESE are almost parallel to the general trends of lineaments in the study area. The results also show that focal mechanism solutions and the main axis of stress field in the Kyonggi massif and Okchon belt are almost same.

Analysis on the Source Characteristics of the Recent Five-year Earthquakes Occurred in the Central and Western Areas of the Korean Peninsula