Magnitude determination of deep-focus earthquakes in and around Japan with regional velocity-amplitude data
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- Katsumata Akio
- Meteorological College
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説明
This paper proposes a new method to determine earthquake magnitude for small deep-focus earthquakes by using velocity-amplitude data. For deep-focus earthquakes, body-wave magnitude has been widely used, but it is difficult to directly apply the conventional methods to the data from short-period seismometers of regional networks. In the proposed method, moment magnitude is used to obtain the attenuation function for epicentral distance and focal depth, where the influence of inhomogeneous Q structure is incorporated. This effect is further reduced by introducing a correction term that is a function of distance from the trench axis to an observation station and focal depth. The attenuation function and correction term were estimated for the velocity amplitude data obtained by the network of the Japan Meteorological Agency. The velocity-amplitude magnitude we propose is in satisfactory agreement with the moment magnitude, and provides stable magnitude values for small earthquakes of deep to shallow focal depths seamlessly.
収録刊行物
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- Earth, Planets and Space
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Earth, Planets and Space 53 (5), 333-346, 2001
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
- 1390001206510885760
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- NII論文ID
- 10007639076
- 130003956216
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- NII書誌ID
- AA11211921
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- ISSN
- 18805981
- 13438832
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- NDL書誌ID
- 5800304
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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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- 使用不可