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タイトル: Development of an Epidemic‐type Aftershock‐sequence Model Explicitly Incorporating the Seismicity‐triggering Effects of Slow Slip Events
著者: Nishikawa, Tomoaki  kyouindb  KAKEN_id  orcid https://orcid.org/0000-0001-5775-4565 (unconfirmed)
Nishimura, Takuya  kyouindb  KAKEN_id  orcid https://orcid.org/0000-0002-2469-8146 (unconfirmed)
著者名の別形: 西川, 友章
西村, 卓也
キーワード: seismicity
slow slip event
earthquake forecast
subduction zone
Hikurangi Trench
発行日: May-2023
出版者: American Geophysical Union (AGU)
誌名: Journal of Geophysical Research: Solid Earth
巻: 128
論文番号: e2023JB026457
抄録: Slow slip events (SSEs) at subduction zone plate boundaries sometimes trigger earthquake swarms and megathrust earthquakes. The causal relationship between SSEs and seismicity has been studied worldwide, but the epidemic-type aftershock-sequence (ETAS) model, which is a standard statistical model of seismicity, does not explicitly consider the seismicity-triggering effect of SSEs. Therefore, if an SSE occurs at a plate boundary, probabilistic earthquake forecasts based on the ETAS model fail to predict observed seismicity. Here, we constructed a statistical model named the SSE-modulated ETAS model by incorporating SSE moment rates estimated from observation data from the global navigation satellite system into the original ETAS model. Our model assumes a linear or power-law relationship between the SSE moment rates and seismicity rates and estimates its proportionality constant as a new ETAS parameter. We applied this new model to three SSEs and M 2.5 or greater earthquakes in the shallow part of the Hikurangi Trench, New Zealand. The results show that it is better than the original ETAS model, giving a significant reduction in the Akaike information criterion. In addition, we examined the functional forms (e.g., lag time and power exponent) of the equation relating the moment rate of the SSEs to the seismicity rate. We also examine the influence of SSEs on aftershock productivity. Our model can improve short-term forecasts of seismicity associated with SSEs if the detection and characterization of SSEs can be done in near real time. Our model is also useful for quantifying characteristics of SSE-induced seismicity.
著作権等: © 2023 The Authors.
This is an open access article under the terms of the Creative Commons Attribution-NonCommercial License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited and is not used for commercial purposes.
URI: http://hdl.handle.net/2433/283307
DOI(出版社版): 10.1029/2023jb026457
出現コレクション:学術雑誌掲載論文等

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