Relocation of Intermediate-depth Earthquakes beneath the NE Japan Arc by Double-Difference Location Method
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- SUGANOMATA Junichi
- Research Center for Prediction of Earthquakes and Volcanic Eruptions, Graduate School of Science, Tohoku University
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- OKADA Tomomi
- Research Center for Prediction of Earthquakes and Volcanic Eruptions, Graduate School of Science, Tohoku University
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- HASEGAWA Akira
- Research Center for Prediction of Earthquakes and Volcanic Eruptions, Graduate School of Science, Tohoku University
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- SAKODA Koji
- Japan Meteorological Agency
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- H. KIRBY Stephen
- U.S. Geological Survey
Bibliographic Information
- Other Title
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- Double-Difference Location 法による東北日本弧下の稍深発地震の震源再決定
- Double-Difference Locationホウ ニ ヨル トウホク ニホン コ カ ノ ショウシンパツ ジシン ノ シンゲン サイケッテイ
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Abstract
We relocated interplate and intraslab earthquakes beneath the Tohoku district of NE Japan using the Double-Difference location method [Waldhauser and Ellsworth (2000)]. Relative earthquake arrival times were determined by waveform cross-spectrum analysis and catalog-picking data. Our relocations show that between 50 and 150 km in depth, most of the upper-plane seismicity occurs in the slab crust, and most of repeating earthquakes seem to occur along the upper boundary of the Pacific plate, where the intraslab seismicity is active. Obtained result shows that both the lower-plane and upper-plane seismicity are distributed unevenly in space. Moreover, there is a spatial correlation between clusters of upper-and lower-plane seismicity. If intermediate-depth earthquakes are caused by dehydration and/or CO2-bearing devolatilization of hydrated minerals [Kirby et al. (1996), Kirby et al. (2004), Peacock (2001), Seno and Yamanaka (1996), Yamasaki and Seno (2003)], the present result suggests that hydrated and/or carbonate minerals are distributed unevenly but in common in both the crust and deeper mantle of the slab. In the southern part of Tohoku district, where some seamounts subduct, seismicity between upper and lower seismic planes is active. If the hydrated and carbonate minerals are abundantly distributed in the slab crust and the slab mantle due to the volcanic activities of the seamount formation, dehydration and devolatization of these minerals may cause intraslab earthquakes.
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.) 59 (1), 1-18, 2006
SEISMOLOGICAL SOCIETY OF JAPAN
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Details 詳細情報について
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- CRID
- 1390282679281458432
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- NII Article ID
- 10020293839
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- NII Book ID
- AN00305741
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- ISSN
- 18839029
- 2186599X
- 00371114
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- NDL BIB ID
- 8530123
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- Text Lang
- ja
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- Data Source
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- JaLC
- NDL
- Crossref
- CiNii Articles
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- Abstract License Flag
- Disallowed