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タイトル: Characteristics of foreshock activity inferred from the JMA earthquake catalog
著者: Tamaribuchi, Koji
Yagi, Yuji
Hirano, Shiro, and, Enescu, Bogdan
キーワード: Foreshocks
Aftershocks
b-value
Nearest-neighbor distance
JMA unified catalog
発行日: 29-May-2018
出版者: Springer Nature
誌名: Earth, Planets and Space
巻: 70
論文番号: 90
抄録: We investigated the foreshock activity characteristics using the Japan Meteorological Agency Unified Earthquake Catalog for the last 20 years. Using the nearest-neighbor distance approach, we systematically and objectively classified the earthquakes into clustered and background seismicity. We further categorized the clustered events into foreshocks, mainshocks, and aftershocks and analyzed their statistical features such as the b-value of the frequency–magnitude distribution. We found that the b-values of the foreshocks are lower than those of the aftershocks. This b-value difference suggested that not only the stochastic cascade effect but also the stress changes/aseismic processes may contribute to the mainshock-triggering process. However, forecasting the mainshock based on b-value analysis may be difficult. In addition, the rate of foreshock occurrence in all clusters (with two or more events) was nearly constant (30–40%) over a wide magnitude range. The difference in the magnitude, time, and epicentral distance between the mainshock and largest foreshock followed a power law. We inferred that the distinctive characteristics of foreshocks can be better revealed using the improved catalog, which includes the micro-earthquake information.
著作権等: © The Author(s) 2018. This article is distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made.
URI: http://hdl.handle.net/2433/234562
DOI(出版社版): 10.1186/s40623-018-0866-9
出現コレクション:学術雑誌掲載論文等

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