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Crustal in South Korea Using the Source Pair/Receiver Pair Method

¹ Department of Earth and Environmental Sciences
Sejong University
Seoul 143-747, South Korea
 (T.W.C.)

² Division of Geological and Environmental Hazards
Korea Institute of Geoscience and Mineral Resources
Daejeon 305-350, South Korea
 (Y.K.P., I.B.K.)

³ School of Earth and Environmental Sciences
Seoul National University
Seoul 151-742, South Korea
 (K.L.)

has been studied extensively because its regional variations reflect geological structure: values around 1 Hz show close correlation with tectonic seismicity. We analyze in South Korea by applying the source pair/receiver pair (SPRP) method to 39 Korean earthquakes and 32 far-regional earthquakes. We obtain nearly 1500 source-receiver pairs with the combined difference of epicentral distance, D, ranging from 16 to 657 km. Seismograms are filtered by using an eight-pole bandpass Butterworth filter with five-center frequencies. 0.375, 0.75, 1.5, 3, and 6 Hz. The obtained for all frequencies are less than 0.002, which is a reasonable value for a seismically inactive region. In spite of the short range of D, the results of the SPRP method show reliable values, especially at 1.5 and 3 Hz.

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