Spatial and temporal characteristics of low-magnitude seismicity from a dense array in western Nagano Prefecture, Japan
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- Rydelek Paul A.
- Center for Earthquake Research and Information, The University of Memphis
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- Horiuchi Shigeki
- National Research Institute for Earth Science and Disaster Prevention, Science and Technology Agency
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- Iio Yoshihisa
- Earthquake Research Institute, University of Tokyo
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We analyze an earthquake catalog and waveform data from a dense seismic array in western Nagano Prefecture in order to investigate seismic properties and source parameters. The catalog used here consists of about 30, 000 smaller magnitude earthquakes that were located within a source volume of order (10 km ) 3. Moving window analysis shows that the seismic rate is steady over time and the temporal change in the size distribution of earthquakes shows only statistical fluctuations. Spatial analyses, however, reveals that certain features of seismicity are depth-dependent. At shallow depths (<3 km), we find an increase in average stress drop with depth that may be related to the characteristic depth of seismicity (the depth where the frequency of earthquakes is maximum). The b-value is also found to be elevated throughout depths where the seismicity is most intense but then the b-value slowly decreases as depth increases. Another result from our analysis of waveform data is a clear relation between earthquake magnitude and stress-drop in the magnitude range -0.5 to 2.5.
収録刊行物
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- Earth, Planets and Space
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Earth, Planets and Space 54 (2), 81-89, 2002
地球電磁気・地球惑星圏学会 、公益社団法人 日本地震学会、特定非営利活動法人 日本火山学会、日本測地学会、日本惑星科学会
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詳細情報 詳細情報について
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- CRID
- 1390282681488351616
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- NII論文ID
- 10008634264
- 130003780877
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- NII書誌ID
- AA11211921
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- ISSN
- 18805981
- 13438832
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- NDL書誌ID
- 6084021
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- 本文言語コード
- en
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- データソース種別
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- JaLC
- NDL
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