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One-dimensional velocity structure and station corrections were inverted from P and S times of 51 events provisionally well-located in the OBS network. We then relocated precisely 239 events in the studied region, using the inverted velocity structure and station corrections.\u003cbr\u003eSeismicity was highest in an area of about 10km\u0026times;10km near the trench axis northeast off the OBS network: the largest event of \u003ci\u003eM\u003c/i\u003e\u003csub\u003eJMA\u003c/sub\u003e 5.6 and other 40 events (probably aftershocks) were located at shallow depths. A mechanism solution of normal fault type with a T-axis of NW direction for the largest event was concordant with bending process of the Philippine sea plate. On the other hand, 18 events at depths of about 30km in a small area north of the OBS network were presumably due to interplate thrusting, because a composite mechanism solution for three events was of reverse fault type with a P-axis of ESE direction. 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One-dimensional velocity structure and station corrections were inverted from P and S times of 51 events provisionally well-located in the OBS network. We then relocated precisely 239 events in the studied region, using the inverted velocity structure and station corrections.\u003cbr\u003eSeismicity was highest in an area of about 10km\u0026times;10km near the trench axis northeast off the OBS network: the largest event of \u003ci\u003eM\u003c/i\u003e\u003csub\u003eJMA\u003c/sub\u003e 5.6 and other 40 events (probably aftershocks) were located at shallow depths. A mechanism solution of normal fault type with a T-axis of NW direction for the largest event was concordant with bending process of the Philippine sea plate. On the other hand, 18 events at depths of about 30km in a small area north of the OBS network were presumably due to interplate thrusting, because a composite mechanism solution for three events was of reverse fault type with a P-axis of ESE direction. 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  1. 防災科研関係論文

海底地震観測によるトカラ海峡-奄美大島北部海域の地震活動

https://nied-repo.bosai.go.jp/records/5852
https://nied-repo.bosai.go.jp/records/5852
107d6c03-f9a4-46be-be33-7ba564d176d5
Item type researchmap(1)
公開日 2023-03-30
タイトル
言語 ja
タイトル 海底地震観測によるトカラ海峡-奄美大島北部海域の地震活動
タイトル
言語 en
タイトル Seismic Activity Inferred from Ocean Bottom Seismographic Observation around Tokara Channel-North Region off Amami Oshima, Nansei Syoto Islands, Western Japan
言語
言語 jpn
著者 八木原 寛

× 八木原 寛

ja 八木原 寛

en YAKIWARA Hiroshi

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渡邊 智毅

× 渡邊 智毅

ja 渡邊 智毅

en WATANABE Tomoki

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望月 将志

× 望月 将志

ja 望月 将志

en MOCHIZUKI Masashi

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根本 泰雄

× 根本 泰雄

ja 根本 泰雄

en NEMOTO Hiroo

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島村 英紀

× 島村 英紀

ja 島村 英紀

en SHIMAMURA Hideki

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角田 寿喜

× 角田 寿喜

ja 角田 寿喜

en KAKUTA Toshiki

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宮町 宏樹

× 宮町 宏樹

ja 宮町 宏樹

en MIYAMACHI Hiroki

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後藤 和彦

× 後藤 和彦

ja 後藤 和彦

en GOTO Kazuhiko

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平野 舟一郎

× 平野 舟一郎

ja 平野 舟一郎

en HIRANO Syuichiro

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日野 亮太

× 日野 亮太

ja 日野 亮太

en HINO Ryota

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金澤 敏彦

× 金澤 敏彦

ja 金澤 敏彦

en KANAZAWA Toshihiko

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海宝 由佳

× 海宝 由佳

ja 海宝 由佳

en KAIHO Yuka

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塩原 肇

× 塩原 肇

ja 塩原 肇

en SHIOBARA Hajime

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抄録
内容記述タイプ Other
内容記述 We investigated seismic activity around Tokara Channel north off Amami Oshima, Nansei Syoto (Ryukyu) Islands of western Japan, using 12 ocean-bottom seismographs (OBS), as well as two temporal stations at Yaku Shima and Amami Oshima islands, operated from April 16 to May 10, 1992. One-dimensional velocity structure and station corrections were inverted from P and S times of 51 events provisionally well-located in the OBS network. We then relocated precisely 239 events in the studied region, using the inverted velocity structure and station corrections.<br>Seismicity was highest in an area of about 10km&times;10km near the trench axis northeast off the OBS network: the largest event of <i>M</i><sub>JMA</sub> 5.6 and other 40 events (probably aftershocks) were located at shallow depths. A mechanism solution of normal fault type with a T-axis of NW direction for the largest event was concordant with bending process of the Philippine sea plate. On the other hand, 18 events at depths of about 30km in a small area north of the OBS network were presumably due to interplate thrusting, because a composite mechanism solution for three events was of reverse fault type with a P-axis of ESE direction. A cluster of 17 events at depths from 10km to 25km was found in a southwest area of the network. These shallow events were probably crustal earthquakes within the Eurasian plate.<br>We found an area of very low seismicity in the southeast of the network during the period studied. It is also identified at the nearly same location in the epicenter distribution from 1984 through 1991 obtained by Japanese Meteorological Agency (JMA) and possibly corresponds to the aftershock area of the 1911 Kikaijima Earthquake (<i>M</i> 8.0).<br>Although we could not confirm any discernible alignments of shallow earthquakes along the Tokara Channel which is a notable tectonic line, the dipping angle of the intermediate-deep seismic zone changes discontinuously from about 65&deg; on the north of the channel to about 40&deg; on the south.
言語 ja
抄録
内容記述タイプ Other
内容記述 We investigated seismic activity around Tokara Channel north off Amami Oshima, Nansei Syoto (Ryukyu) Islands of western Japan, using 12 ocean-bottom seismographs (OBS), as well as two temporal stations at Yaku Shima and Amami Oshima islands, operated from April 16 to May 10, 1992. One-dimensional velocity structure and station corrections were inverted from P and S times of 51 events provisionally well-located in the OBS network. We then relocated precisely 239 events in the studied region, using the inverted velocity structure and station corrections.<br>Seismicity was highest in an area of about 10km&times;10km near the trench axis northeast off the OBS network: the largest event of <i>M</i><sub>JMA</sub> 5.6 and other 40 events (probably aftershocks) were located at shallow depths. A mechanism solution of normal fault type with a T-axis of NW direction for the largest event was concordant with bending process of the Philippine sea plate. On the other hand, 18 events at depths of about 30km in a small area north of the OBS network were presumably due to interplate thrusting, because a composite mechanism solution for three events was of reverse fault type with a P-axis of ESE direction. A cluster of 17 events at depths from 10km to 25km was found in a southwest area of the network. These shallow events were probably crustal earthquakes within the Eurasian plate.<br>We found an area of very low seismicity in the southeast of the network during the period studied. It is also identified at the nearly same location in the epicenter distribution from 1984 through 1991 obtained by Japanese Meteorological Agency (JMA) and possibly corresponds to the aftershock area of the 1911 Kikaijima Earthquake (<i>M</i> 8.0).<br>Although we could not confirm any discernible alignments of shallow earthquakes along the Tokara Channel which is a notable tectonic line, the dipping angle of the intermediate-deep seismic zone changes discontinuously from about 65&deg; on the north of the channel to about 40&deg; on the south.
言語 en
書誌情報 ja : 地震 第2輯
en : Zisin (Journal of the Seismological Society of Japan. 2nd ser.)

巻 49, 号 2, p. 227-239, 発行日 1996
出版者
言語 ja
出版者 公益社団法人 日本地震学会
出版者
言語 en
出版者 SEISMOLOGICAL SOCIETY OF JAPAN
ISSN
収録物識別子タイプ EISSN
収録物識別子 1883-9029
DOI
関連識別子 10.4294/zisin1948.49.2_227
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