Relocation of the <I>M</I>∼7 Miyagi-oki Earthquakes in the 1930s: Seismic Slips of Asperities that Were Re-ruptured during the 1978 <I>M</I>7.4 Miyagi-oki Earthquake ?
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- UMINO Norihito
- Research Center for Prediction of Earthquakes and Volcanic Eruptions, Graduate School of Science, Tohoku University
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- KONO Toshio
- 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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- NAKAJIMA Junichi
- Research Center for Prediction of Earthquakes and Volcanic Eruptions, Graduate School of Science, Tohoku University
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- MATSUZAWA Toru
- Research Center for Prediction of Earthquakes and Volcanic Eruptions, Graduate School of Science, Tohoku University
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- UCHIDA Naoki
- 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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- TAMURA Yoshiaki
- National Astronomical Observatory of Japan
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- AOKI Gen
- Sendai District Meteorological Observatory
Bibliographic Information
- Other Title
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- 1930年代に発生した<I>M</I>7クラスの宮城県沖地震の震源再決定
- 1930年代に発生したM7クラスの宮城県沖地震の震源再決定--1978年宮城県沖地震のアスペリティでのすべりだったのか?
- 1930ネンダイ ニ ハッセイシタ M7 クラス ノ ミヤギケンオキ ジシン ノ シンゲン サイケッテイ 1978ネン ミヤギケンオキ ジシン ノ アスペリティ デノ スベリ ダッタノカ
- Relocation of the M^|^sim;7 Miyagi-oki Earthquakes in the 1930s: Seismic Slips of Asperities that Were Re-ruptured during the 1978 M7.4 Miyagi-oki Earthquake ?
- —1978年宮城県沖地震のアスペリティでのすべりだったのか?—
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Abstract
Hypocenters of the main shocks and aftershocks of the 1933 Mjma 7.1, 1936 Mjma 7.4, 1937 Mjma 7.1, 1939 Mjma 6.9, 1978 Mjma 7.4, and 1981 Mjma 7.0 Miyagi-oki, NE Japan, earthquakes are relocated by using S-P times reported in the Seismological Bulletin of the Japan Meteorological Agency (JMA) and those re-read from original smoked-paper seismograms observed at Mizusawa station of National Astronomical Observatory of Japan (NAOJ) and at Mukaiyama station of Tohoku University. In order to avoid large errors caused by inaccuracies in the arrival times of P- and S-waves and the limited number of observation stations, we determined hypocenters by using a grid search method based on the assumption that these events occurred at the boundary between the subducting Pacific plate and the overriding plate. The main shock epicenters of the 1933, 1936, 1937, and 1978 earthquakes are determined close to each other, and distributions of their aftershocks show that aftershock areas of 1933, 1936, and 1937 events partly overlap with that of the 1978 event and occupy its easternmost, central, and westernmost portions, respectively. It is likely that the 1933, 1936, and 1937 events possibly ruptured a part of the source area of the 1978 event, that is the eastern, central, and western portions, respectively. Locations of the main shock and aftershock area of the 1939 event are adjacent to the eastern edge of the source area of 1978 event. After the 1978 event, the 1981 earthquake had occurred there following the slip on the asperities in the presumed Miyagi-oki earthquake source area.
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 (4), 325-337, 2007
SEISMOLOGICAL SOCIETY OF JAPAN
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Details 詳細情報について
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- CRID
- 1390282679279736064
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- NII Article ID
- 10020152386
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- NII Book ID
- AN00305741
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- ISSN
- 18839029
- 2186599X
- 00371114
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- NDL BIB ID
- 8870149
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- Text Lang
- ja
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- Data Source
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- JaLC
- NDL
- Crossref
- CiNii Articles
- KAKEN
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- Abstract License Flag
- Disallowed