Increased radon-222 in soil gas because of cumulative seismicity at active faults

• Material Type: 記事
• Title: Increased radon-222 in soil gas because of cumulative seismicity at active faults
• Author/Editor: Katsuaki Koike; Tohru Yoshinaga; Takayoshi Ueyama
• Publication, Distribution, etc.: 日本 : Springer science+business media
• Publication Date: 2014-06-17
• Publication Date (W3CDTF): 2014-06-17
• Periodical title: EPS : Earth, Planets and Space
• No. or year of volume/issue: 66(57)
• Volume: 66(57)
• ISSN (Periodical Title): 1880-5981
• ISSN-L (Periodical Title): 1343-8832
• Text Language Code: eng
• DOI: 10.1186/1880-5981-66-57; https://doi.org/10.1186/1880-5981-66-57
• Persistent ID (NDL): info:ndljp/pid/9227812; https://dl.ndl.go.jp/pid/9227812
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• Date Accepted (W3CDTF): 2015-04-17T10:30:12+09:00
• Date Captured (W3CDTF): 2014-10-10
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• Periodical Title (URI): https://www.earth-planets-space.com/content/66/June/2014
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• Bibliographic ID (NDL): 9227812; http://id.ndl.go.jp/bib/9227812
• Bibliographic Record Category (NDL): 632

• Summary, etc.: This study demonstrates how the radon-222 ({222}Rn) concentration of soil gas at an active fault is sensitive to cumulative recent seismicity by examining seven active faults in western Japan. The {222}Rn concentration was found to correlate well with the total earthquake energy within a 100-km radius of each fault. This phenomenon can probably be ascribed to the increase of pore pressure around the source depth of {222}Rn in shallow soil caused by frequently induced strain. This increase in pore pressure can enhance the ascent velocity of {222}Rn carrier gas as governed by Darcy's law. Anomalous {222}Rn concentrations are likely to originate from high gas velocities, rather than increased accumulations of parent nuclides. The high velocities also can yield unusual young gas under the radioactive nonequilibrium condition of short elapsed time since {222}Rn generation. The results suggest that ongoing seismicity in the vicinity of an active fault can cause accumulation of strain in shallow fault soils. Therefore, the {222}Rn concentration is a possible gauge for the degree of strain accumulation.
• DOI: 10.1186/1880-5981-66-57; https://doi.org/10.1186/1880-5981-66-57
• Access Restrictions: インターネット公開
• Rights (production): © 2014 Koike et al.; licensee Springer.; This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/2.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly credited.
• Related Material (URI): http://hdl.handle.net/2433/189428; http://id.ndl.go.jp/digimeta/9227812; https://dl.ndl.go.jp/pid/9227812; http://link.springer.com/content/pdf/10.1186/1880-5981-66-57.pdf; http://link.springer.com/article/10.1186/1880-5981-66-57/fulltext.html
• Is Referenced By: An Ancient >200m Cumulative Normal Faulting Displacement Along the Futagawa Fault Dextrally Ruptured During the 2016 Kumamoto, Japan, Earthquake Identified by a Multiborehole Drilling Program; https://cir.nii.ac.jp/crid/1050290932537078400; Seismicity controlled by resistivity structure : the 2016 Kumamoto earthquakes, Kyushu Island, Japan; https://cir.nii.ac.jp/crid/1050587981430736000; Detection of Near-Surface Permeable Zones Based on Spatial Correlation Between Radon Gas Concentration and DTM-Derived Lineament Density; https://cir.nii.ac.jp/crid/1360853567481534464; 地熱資源有効利用促進のための蒸気スポット検出法の開発と地熱フィールドへの適用; https://cir.nii.ac.jp/crid/1390870696563146880; Electrical conductive fluid-rich zones and their influence on the earthquake initiation, growth, and arrest processes : observations from the 2016 Kumamoto earthquake sequence, Kyushu Island, Japan; https://cir.nii.ac.jp/crid/2051996266985497472
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• Bibliographic ID (NDL): 9227812; http://id.ndl.go.jp/bib/9227812
• NAID: 120005466710