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A Study of the Regional Variation of Low-Frequency around the Korean Peninsula

Sejong University, Seoul 143-747, Korea chungtw{at}sejong.ac.kr

Myung-Hyun Noh

Korea Institute of Nuclear Safety, Daejon 305-338, Korea

Junk-Kyong Kim

Semyung University, Chungbuk, 390-711, Korea

Yun-Kyong Park

Korea Institute of Geoscience and Mineral Resources, Daejon 305-350, Korea

Hyun-Jae Yoo

Korea Polar Research Institute, KORDI, Incheon 406-840, Korea

Jonathan M. Lees

University of North Carolina, Chapel Hill, North Carolina 27599-3315

^* Present address: Lab of Seismology, Department of Geological Sciences, 209 Mitchell Hall, CB#3315, University of North Carolina, Chapel Hill, North Carolina 27599-3315.

Online Material: Table of earthquake-station pairs analyzed.

We studied regional at 1 Hz () around the Korean Peninsula based on broadband vertical component seismic records of six Incorporated Research Institutions for Seismology (IRIS) Global Seismographic Network stations and 19 Korean stations of the Korea Institute of Geoscience and Mineral Resources (KIGAM). Using 177 seismic events with magnitudes between 5.3 and 5.7 and depths less than 50 km, the reversed two station method was applied, and 94 high quality interstation paths were selected from 869 possible pairs. These results show high paths around the Sea of Japan (East Sea) reflecting the typical oceanic structure and low paths around northeastern China related to inactive seismicity. Assigning these path values into 193 cells around South Korea with a size of 1° by 1°, we observed that the regional decreased gradually from east to west between 2 and 1x10^-3.

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