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  1. 防災科研関係論文

Evaluation and interpretation of the effects of heterogeneous layers in an OBS/air-gun crustal structure study

https://nied-repo.bosai.go.jp/records/4653
https://nied-repo.bosai.go.jp/records/4653
ad8754cf-2f74-4cc0-9a1f-3c1e96a8d8ff
Item type researchmap(1)
公開日 2023-03-30
タイトル
言語 en
タイトル Evaluation and interpretation of the effects of heterogeneous layers in an OBS/air-gun crustal structure study
言語
言語 eng
著者 Kayoko Tsuruga

× Kayoko Tsuruga

en Kayoko Tsuruga

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Junzo Kasahara

× Junzo Kasahara

en Junzo Kasahara

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Ryuji Kubota

× Ryuji Kubota

en Ryuji Kubota

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Eiichiro Nishiyama

× Eiichiro Nishiyama

en Eiichiro Nishiyama

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Aya Kamimura

× Aya Kamimura

en Aya Kamimura

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Yoshihiro Naito

× Yoshihiro Naito

en Yoshihiro Naito

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Fuminori Honda

× Fuminori Honda

en Fuminori Honda

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Nobutaka Oikawa

× Nobutaka Oikawa

en Nobutaka Oikawa

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Yasuo Tamura

× Yasuo Tamura

en Yasuo Tamura

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Azusa Nishizawa

× Azusa Nishizawa

en Azusa Nishizawa

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Kentaro Kaneda

× Kentaro Kaneda

en Kentaro Kaneda

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抄録
内容記述タイプ Other
内容記述 We present a method for interpreting seismic records with arrivals and waveforms having characteristics which could be generated by extremely inhomogeneous velocity structures, such as non-typical oceanic crust, decollement at subduction zones, and seamounts in oceanic regions, by comparing them with synthetic waveforms. Recent extensive refraction and wide-angle reflection surveys in oceanic regions have provided us with a huge number of high-resolution and high-quality seismic records containing characteristic arrivals and waveforms, besides first arrivals and major reflected phases such as PmP. Some characteristic waveforms, with significant later reflected phases or anomalous amplitude decay with offset distance, are difficult to interpret using only a conventional interpretation method such as the traveltime tomographic inversion method. We find the best process for investigating such characteristic phases is to use an interactive interpretation method to compare observed data with synthetic waveforms, and calculate raypaths and traveltimes. This approach enables us to construct a reasonable structural model that includes all of the major characteristics of the observed waveforms. We present results here with some actual observed examples that might be of great help in the interpretation of such problematic phases. Our approach to the analysis of waveform characteristics is endorsed as an innovative method for constructing high-resolution and high-quality crustal structure models, not only in oceanic regions, but also in the continental regions. c ASEG/SEGJ/KSEG 2008.
言語 en
書誌情報 en : Exploration Geophysics

巻 39, 号 1, p. 1-14, 発行日 2008
ISSN
収録物識別子タイプ ISSN
収録物識別子 0812-3985
DOI
関連識別子 10.1071/EG08004
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