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北海道大学地球物理学研究報告 = Geophysical bulletin of Hokkaido University >
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Title: ボアホール地震観測網により観測された札幌周辺の微小地震
Other Titles: Microearthquakes beneath Sapporo urban area observed by using borehole seismometers
Authors: 吉田, 邦一1 Browse this author
笠原, 稔2 Browse this author
笹谷, 努3 Browse this author
Authors(alt): Yoshida, Kunikazu1
Kasahara, Minoru2
Sasatani, Tsutomu3
Issue Date: 15-Mar-2009
Publisher: 北海道大学大学院理学研究院自然史科学部門(地球物理学)
Journal Title: 北海道大学地球物理学研究報告
Journal Title(alt): Geophysical bulletin of Hokkaido University
Volume: 72
Start Page: 315
End Page: 330
Abstract: On May, 1997, Sapporo municipality installed three borehole seismometers in Sapporo city to observe microearthquakes in and in its vicinity of Sapporo. Ueyama company has also installed strong-motion and high-gain seismometers at three borehole stations in and around Sapporo since 1999. We have collected seismic record from these borehole stations as well as other highgain seismic stations operated by various organizations and have determined hypocenters of 128 microearthquakes (M=0.2-2.8) occurring beneath Sapporo urban area from May, 1997 to January, 2004. Hypocentral distribution shows clusters of earthquakes near the central part and the eastern--southeastern part of Sapporo. A focal mechanism for one earthquake estimated from P-wave first motion polarities has nearly east--west pressure axis.
Type: bulletin (article)
Appears in Collections:北海道大学地球物理学研究報告 = Geophysical bulletin of Hokkaido University > 第72号

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