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  1. 防災科研関係論文

Tectonic setting of the Azores Plateau deduced from a OBS survey

https://nied-repo.bosai.go.jp/records/4435
https://nied-repo.bosai.go.jp/records/4435
8e9cb37e-2657-4fd1-b026-1df8ab1c80c1
Item type researchmap(1)
公開日 2023-03-30
タイトル
言語 en
タイトル Tectonic setting of the Azores Plateau deduced from a OBS survey
言語
言語 eng
著者 JM Miranda

× JM Miranda

en JM Miranda

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LAM Victor

× LAM Victor

en LAM Victor

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JZ Simoes

× JZ Simoes

en JZ Simoes

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JF Luis

× JF Luis

en JF Luis

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L Matias

× L Matias

en L Matias

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H Shimamura

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en H Shimamura

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H Shiobara

× H Shiobara

en H Shiobara

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H Nemoto

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en H Nemoto

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H Mochizuki

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en H Mochizuki

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A Hirn

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JC Lepine

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en JC Lepine

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抄録
内容記述タイプ Other
内容記述 The studies of Azores seismicity generally show shocks with either normal faulting or right-lateral strike-slip along the ESE direction, compatible with a eastward relative motion of the Eurasian (EU) relative to the African (AF) plate. However, the 1 January 1980 earthquake was interpreted as a clear left-lateral strike-slip shock along the N150E direction. This pattern is difficult to explain in terms of the relative motion between the EU, AF and North American (NA) plates: all available models for the present day movement of this triple junction fail to explain the regional variability in the stress conditions of the area. Here we present data from a 34-day long Ocean Bottom Seismograph array deployment. We show that the seismicity is distributed along a band aligned with the island chain itself, and is concentrated along several faults with an approximate N150E strike, cutting the Azores plateau in all the area covered by the OBS network. The combination of these new results with other geophysical data permits us to conclude that the tectonic setting of the Azores plateau is characterised by the existence of two sets of faults, in the N120E and N150E directions, defining several crustal blocks, whose relative motion accommodates the interaction of the three megaplates. The deformation of these tectonic blocks is probably driven by the shear between the EU and AF plates. This model explains well the spatial variability of the stress conditions in the Azores domain, the combination of dextral and sinistral strike slip mechanisms and the observed seismotectonics of the Azores islands.
言語 en
書誌情報 en : MARINE GEOPHYSICAL RESEARCHES

巻 20, 号 3, p. 171-182
出版者
言語 en
出版者 KLUWER ACADEMIC PUBL
ISSN
収録物識別子タイプ ISSN
収録物識別子 0025-3235
DOI
関連識別子 10.1023/A:1004622825210
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