Crustal anisotropy structure related to lateral and down‐dip variations in interplate coupling beneath the Kii Peninsula, SW Japan
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- Atsushi Saiga
- Earthquake Research Institute University of Tokyo Tokyo Japan
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- Aitaro Kato
- Earthquake Research Institute University of Tokyo Tokyo Japan
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- Shin'ichi Sakai
- Earthquake Research Institute University of Tokyo Tokyo Japan
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- Takaya Iwasaki
- Earthquake Research Institute University of Tokyo Tokyo Japan
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- Naoshi Hirata
- Earthquake Research Institute University of Tokyo Tokyo Japan
書誌事項
- 公開日
- 2011-05-05
- 資源種別
- journal article
- 権利情報
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- http://onlinelibrary.wiley.com/termsAndConditions#vor
- DOI
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- 10.1029/2011gl047405
- 公開者
- American Geophysical Union (AGU)
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説明
<jats:p>Anisotropy is an important feature of elastic wave propagation in the Earth, and can arise from a variety of ordered architectures such as fractures with preferential alignments or lattice‐preferred orientations. We studied regional variations in shear wave anisotropy beneath southern Kii Peninsula, which is located above the subducting Philippine Sea plate, using waveforms of local earthquakes observed with a dense seismic network. The fast directions of polarization are normal to the strike of the plate margin in the proximity of the locked portion of the underlying mega‐thrust fault, but they are subparallel to the strike of the margin along the fault's down‐dip extension. The distribution of the fast directions roughly coincides with that of the maximum horizontal compressive stress axis directions as inferred from earthquake focal mechanisms and borehole stress measurements. This indicates that the observed anisotropy is likely controlled by crustal stresses. Furthermore, the directions of the stress‐induced anisotropy correlate well with variations of the plate coupling ratio along the plate boundary as inferred from geodetic measurements. These results indicate the possibility that crustal anisotropy within an overlying plate can be used as an effective measure to monitor temporal variations of the plate coupling strength during the interseismic period.</jats:p>
収録刊行物
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- Geophysical Research Letters
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Geophysical Research Letters 38 (9), L09307-, 2011-05-05
American Geophysical Union (AGU)
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詳細情報 詳細情報について
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- CRID
- 1360004233288115840
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- NII論文ID
- 10030183089
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- ISSN
- 19448007
- 00948276
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- 資料種別
- journal article
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- データソース種別
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- Crossref
- CiNii Articles
- KAKEN
- OpenAIRE
