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Geochemical Signature of Deep Fluids Triggering Earthquake Swarm in the Noto Peninsula, Central Japan
https://nied-repo.bosai.go.jp/records/6689
https://nied-repo.bosai.go.jp/records/6689cb7158c0-ae54-49af-90ca-c5b0635bfdab
Item type | researchmap(1) | |||||||||||
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公開日 | 2024-07-08 | |||||||||||
タイトル | ||||||||||||
言語 | en | |||||||||||
タイトル | Geochemical Signature of Deep Fluids Triggering Earthquake Swarm in the Noto Peninsula, Central Japan | |||||||||||
著者 |
Koji Umeda
× Koji Umeda
× Yukino Yamazaki
× Hirochika Sumino
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抄録 | ||||||||||||
内容記述タイプ | Other | |||||||||||
内容記述 | Abstract On New Year's Day 2024, a magnitude 7.6 event struck the Noto Peninsula in central Japan. Prior to this event, an intense earthquake swarm had persisted beneath the northeastern peninsula for more than five years. Geophysical evidence provides insight into the upwelling of deep fluids from the uppermost mantle that triggers the seismic swarm activity. The noble gases and their isotopes have been used as geochemical indicators to determine the origin of the fluids associated with the swarms and their upwelling. Gas samples collected from boreholes around the seismic source region are characterized by anomalously high <sup>3</sup>He/<sup>4</sup>He ratios (∼3.9 R<sub>Acor</sub>), indicating infiltration of mantle fluids from the subcrustal lithosphere. Using a steady‐state advection model, we calculated mantle helium fluxes of 1.1–2.4 × 10<sup>−15</sup> mol cm<sup>−2</sup> a<sup>−1</sup>, similar to those estimated for other representative fault zones, such as the San Andreas and North Anatolian faults. |
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言語 | en | |||||||||||
書誌情報 |
en : Geophysical Research Letters 巻 51, 号 13, 発行日 2024-06-28 |
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出版者 | ||||||||||||
言語 | en | |||||||||||
出版者 | American Geophysical Union (AGU) | |||||||||||
ISSN | ||||||||||||
収録物識別子タイプ | EISSN | |||||||||||
収録物識別子 | 1944-8007 | |||||||||||
DOI | ||||||||||||
関連識別子 | 10.1029/2024gl108581 |