Title Transcription | シマネケン ニ オケル 2001ネン イコウ ノ ジシン カツドウ ト チケイ オヨビ チシツ トノ ヒカク
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Title Alternative (English) | Seismicity of recent years after 2001 in Shimane Prefecture and its implication to the local geomorphology and geology
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File | |
language |
jpn
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Author | |
Description | This study demonstrates the detailed correlation of recent seismicity (2001-2010) with geomorphological analyses, surface geology and gravity anomaly in Shimane Prefecture, southwestern Honshu, Japan. The epicenter distribution of small earthquakes is characterized by the NE-SW zonal concentration extending from the northern part of Yamaguchi Prefecture to around Mt. Sambe in Oda City (Yamaguchi-Izumo Intra-Plate Seismic Zone: YISZ). With the conjugate sense of the seismic zone, relatively small zone of NNW-SSE trending are observed from Mt. Sambe to Miyoshi City, Hiroshima Prefecture (Sambe-Miyoshi Seismic Zone: SMSZ).
The YISZ can be correlated with the geomorphological boundary between the Tsunozu and Kibi Low-relief Surfaces in the Iwami Highland. With respect to the steep gradient of gravity anomaly, a concealed tectonic line related to the deposition of the Pliocene Tsunozu Formation is implied just beneath the seismic zone. It suggests that the recent activity of the seismic zone occurs at the concealed tectonic line under the present ENE-WSW compression field. Around the SMSZ, many lineaments with N30°W and N60°W trending are recognized. These trending directions are generally concordant with the focal mechanisms of earthquakes in this region. According to the detailed epicenter distribution in the seismic zone, NNW-trending small segments of seismicity are recognized with a right-stepping arrangement. It indicates that the right-stepping pattern in the seismic zone might be originated by the left-lateral slip of a concealed NW-SE tectonic line. |
Subject | seismicity
geomorphology
geology
Bouguer gravity anomaly
Shimane Prefecture
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Journal Title |
Geoscience reports of Shimane University
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Volume | 35
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Start Page | 17
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End Page | 24
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ISSN | 13439774
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Published Date | 2016-12
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NCID | AA11455176
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DOI(SelfDOI) | |
Publisher | 島根大学大学院総合理工学研究科地球資源環境学教室
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Publisher Aalternative | Graduate School of Science and Engineering, Shimane University
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NII Type |
Departmental Bulletin Paper
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Format |
PDF
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Rights | 島根大学総合理工学部地球資源環境学教室
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Text Version |
出版社版
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Gyoseki ID | e31372
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OAI-PMH Set |
Interdisciplinary Graduate School of Science and Engineering
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他の一覧 |