Seismic Activities and Tectonics in and around Kyushu and the Northern Half of Nansei Shoto
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- KAKUTA Toshiki
- Nansei-toko Observatory for Earthquakes and Volcanoes, Faculty of Science
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- GOTO Kazuhiko
- Nansei-toko Observatory for Earthquakes and Volcanoes, Faculty of Science
Bibliographic Information
- Other Title
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- 九州-南西諸島北部域の地震活動とテクトニクス
- キュウシュウ ナンセイ ショトウ ホクブイキ ノ ジシン カツドウ ト テクトニクス
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Abstract
We reviewd characteristics of seismic activities in and around Kyushu and the northern half of Nansei Shoto (Ryukyu Islands), mainly on the basis of hypocenter distributions and focal mechanisms. Interplate and intraplate earthquakes, inclusive of intermediate-depth events, considerably differ in seismicity from region to region along the arc. Most of the boundaries between the seismic regions correspond to left-lateral tectonic lines geologically inferred and/ or narrow zones of crustal earthquakes of left-lateral strike slip types across the arc. Thus we surmise that the Philippine sea plate spiitted into several segments subducts with low coupling under the Kyushu-Ryukyu arc.<BR>Not only rifting along the Okinawa trough but also southeastward spreading from the Shanshi graben with left-lateral movements is probably important for crustal earthquakes of normal and strike-slip fault types dominant in an extensional stress field in the marginal sea and inland areas.
Journal
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- Zisin (Journal of the Seismological Society of Japan. 2nd ser.)
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Zisin (Journal of the Seismological Society of Japan. 2nd ser.) 55 (3), 317-336, 2002
SEISMOLOGICAL SOCIETY OF JAPAN
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Details 詳細情報について
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- CRID
- 1390282679282524416
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- NII Article ID
- 130006787839
- 10021094247
- 10010086473
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- NII Book ID
- AN00305741
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- ISSN
- 18839029
- 2186599X
- 00371114
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- NDL BIB ID
- 6562830
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- Data Source
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- JaLC
- NDL
- Crossref
- CiNii Articles
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- Abstract License Flag
- Disallowed