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  1. 防災科研関係論文

The 3-D distribution of random velocity inhomogeneities in southwestern Japan and the western part of the Nankai subduction zone

https://nied-repo.bosai.go.jp/records/4078
https://nied-repo.bosai.go.jp/records/4078
b3451db5-baaa-40f9-a26f-443ca3813ef9
Item type researchmap(1)
公開日 2023-03-30
タイトル
言語 en
タイトル The 3-D distribution of random velocity inhomogeneities in southwestern Japan and the western part of the Nankai subduction zone
言語
言語 eng
著者 Tsutomu Takahashi

× Tsutomu Takahashi

en Tsutomu Takahashi

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Koichiro Obana

× Koichiro Obana

en Koichiro Obana

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Yojiro Yamamoto

× Yojiro Yamamoto

en Yojiro Yamamoto

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Ayako Nakanishi

× Ayako Nakanishi

en Ayako Nakanishi

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Shuichi Kodaira

× Shuichi Kodaira

en Shuichi Kodaira

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Yoshiyuki Kaneda

× Yoshiyuki Kaneda

en Yoshiyuki Kaneda

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抄録
内容記述タイプ Other
内容記述 Seismic waves at high frequencies (&gt
1Hz) show collapsed and broadened wave trains caused by multiple scattering in the lithosphere. This study analyzed the envelopes of direct S waves in southwestern Japan and on the western side of the Nankai trough and estimated the spatial distribution of random inhomogeneities by assuming a von Kármán type power spectral density function (PSDF). Strongly inhomogeneous media have been mostly imaged at shallow depth (0-20 km depth) in the onshore area of southwestern Japan, and their PSDF is represented as P(m)≈0.05m-3.7 km3, with m being the spatial wave number, whereas most of the other area shows weak inhomogeneities of which PSDF is P(m)≈0.005m-4.5 km3. At Hyuga-nada in Nankai trough, there is an anomaly of inhomogeneity of which PSDF is estimated as P(m)≈0.01m-4.5 km3. This PSDF has the similar spectral gradient with the weakly inhomogeneous media, but has larger power spectral density than other offshore areas. This anomalous region is broadly located in the subducted Kyushu Palau ridge, which was identified by using velocity structures and bathymetry, and it shows no clear correlation with the fault zones of large earthquakes in past decades. These spatial correlations suggest that possible origins of inhomogeneities at Hyuga-nada are ancient volcanic activity in the oceanic plate or deformed structures due to the subduction of the Kyushu Palau ridge. © 2013. American Geophysical Union.
言語 en
書誌情報 en : Journal of Geophysical Research: Solid Earth

巻 118, 号 5, p. 2246-2257
出版者
言語 en
出版者 Blackwell Publishing Ltd
ISSN
収録物識別子タイプ ISSN
収録物識別子 2169-9356
DOI
関連識別子 10.1002/jgrb.50200
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