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タイトル: | Spatial heterogeneities in tectonic stress in Kyushu, Japan and their relation to a major shear zone Seismology |
著者: | Matsumoto, Satoshi Nakao, Shigeru Ohkura, Takahiro https://orcid.org/0000-0003-1905-6330 (unconfirmed) Miyazaki, Masahiro Shimizu, Hiroshi Abe, Yuki Inoue, Hiroyuki Nakamoto, Manami Yoshikawa, Shin Yamashita, Yusuke https://orcid.org/0000-0002-5347-5216 (unconfirmed) |
著者名の別形: | 大倉, 敬宏 山下, 裕亮 |
キーワード: | Stress field Kyushu Shear zone Graben |
発行日: | 23-Oct-2015 |
出版者: | SpringerOpen |
誌名: | Earth, Planets and Space |
巻: | 67 |
論文番号: | 172 |
抄録: | We investigated the spatial variation in the stress fields of Kyushu Island, southwestern Japan. Kyushu Island is characterized by active volcanoes (Aso, Unzen, Kirishima, and Sakurajima) and a shear zone (western extension of the median tectonic line). Shallow earthquakes frequently occur not only along active faults but also in the central region of the island, which is characterized by active volcanoes. We evaluated the focal mechanisms of the shallow earthquakes on Kyushu Island to determine the relative deviatoric stress field. Generally, the stress field was estimated by using the method proposed by Hardebeck and Michael (2006) for the strike-slip regime in this area. The minimum principal compression stress (σ3), with its near north-south trend, is dominant throughout the entire region. However, the σ 3 axes around the shear zone are rotated normal to the zone. This result is indicative of shear stress reduction at the zone and is consistent with the right-lateral fault behavior along the zone detected by a strain-rate field analysis with global positioning system data. Conversely, the stress field of the normal fault is dominant in the Beppu-Shimabara area, which is located in the central part of the island. This result and the direction of σ3 are consistent with the formation of a graben structure in the area. |
著作権等: | © 2015 Matsumoto et al. This article is distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. |
URI: | http://hdl.handle.net/2433/212430 |
DOI(出版社版): | 10.1186/s40623-015-0342-8 |
出現コレクション: | 学術雑誌掲載論文等 |
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