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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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