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  1. 防災科研関係論文

Joint inversion of ocean-bottom pressure and GNSS data from the 2003 Tokachi-oki earthquake

https://nied-repo.bosai.go.jp/records/6358
https://nied-repo.bosai.go.jp/records/6358
186c80e2-2d4a-43ee-a963-bd897180ba9d
Item type researchmap(1)
公開日 2023-09-20
タイトル
言語 ja
タイトル Joint inversion of ocean-bottom pressure and GNSS data from the 2003 Tokachi-oki earthquake
タイトル
言語 en
タイトル Joint inversion of ocean-bottom pressure and GNSS data from the 2003 Tokachi-oki earthquake
言語
言語 eng
著者 SatByul Kim

× SatByul Kim

ja SatByul Kim

en SatByul Kim

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Tatsuhiko Saito

× Tatsuhiko Saito

ja Tatsuhiko Saito

en Tatsuhiko Saito

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Tatsuya Kubota

× Tatsuya Kubota

ja Tatsuya Kubota

en Tatsuya Kubota

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Sung-Joon Chang

× Sung-Joon Chang

ja Sung-Joon Chang

en Sung-Joon Chang

Search repository
抄録
内容記述タイプ Other
内容記述 When the 2003 Tokachi-oki earthquake generated a large tsunami off eastern Hokkaido, Japan, it was detected by cabled ocean-bottom pressure gauges (OBPs) installed within the seismic source region. The OBP records included characteristic features of tsunami waveforms in the source region, indicating significant offset due to the permanent sea-bottom displacement, which can provide critical information about the earthquake source. However, no studies have considered the OBP tsunami data observed in the focal region for the source inversion of the Tokachi-oki earthquake. Here, in order to better understand the 2003 Tokachi-oki earthquake source, we estimate the spatial distribution of fault slip by conducting a joint inversion using two different datasets: tsunami data from four OBPs, located in the focal region and about 300 km away to the south, as well as Global Navigation Satellite System (GNSS) data obtained throughout Hokkaido and northern Honshu. Through our joint inversion, we found that the most dominant slip peak is located 40 km northwest from the hypocenter with an abnormally large slip of ?15 m. This large slip may result from releasing a high amount of slip deficit accumulated by a stick?slip patch surrounded by stable slip regions on the southernmost Kuril subduction zone. By comparing the OBP observations and the synthetic tsunami waveforms derived from our fault model and other fault models, we conclude that the OBP tsunami data recorded within the focal region better constrained the magnitude and the location of the slip compared to other geophysical data.
言語 ja
抄録
内容記述タイプ Other
内容記述 When the 2003 Tokachi-oki earthquake generated a large tsunami off eastern Hokkaido, Japan, it was detected by cabled ocean-bottom pressure gauges (OBPs) installed within the seismic source region. The OBP records included characteristic features of tsunami waveforms in the source region, indicating significant offset due to the permanent sea-bottom displacement, which can provide critical information about the earthquake source. However, no studies have considered the OBP tsunami data observed in the focal region for the source inversion of the Tokachi-oki earthquake. Here, in order to better understand the 2003 Tokachi-oki earthquake source, we estimate the spatial distribution of fault slip by conducting a joint inversion using two different datasets: tsunami data from four OBPs, located in the focal region and about 300 km away to the south, as well as Global Navigation Satellite System (GNSS) data obtained throughout Hokkaido and northern Honshu. Through our joint inversion, we found that the most dominant slip peak is located 40 km northwest from the hypocenter with an abnormally large slip of ?15 m. This large slip may result from releasing a high amount of slip deficit accumulated by a stick?slip patch surrounded by stable slip regions on the southernmost Kuril subduction zone. By comparing the OBP observations and the synthetic tsunami waveforms derived from our fault model and other fault models, we conclude that the OBP tsunami data recorded within the focal region better constrained the magnitude and the location of the slip compared to other geophysical data.
言語 en
書誌情報 ja : Earth, Planets and Space
en : Earth, Planets and Space

巻 75, p. 113, 発行日 2023-07-18
DOI
関連識別子 10.1186/s40623-023-01864-x
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