Global S&T Development Trend Analysis Platform of Resources and Environment
DOI | 10.1002/2017GL076287 |
A Model of Aftershock Migration Driven by Afterslip | |
Perfettini, H.1; Frank, W. B.2,3; Marsan, D.1; Bouchon, M.1 | |
2018-03-16 | |
发表期刊 | GEOPHYSICAL RESEARCH LETTERS |
ISSN | 0094-8276 |
EISSN | 1944-8007 |
出版年 | 2018 |
卷号 | 45期号:5页码:2283-2293 |
文章类型 | Article |
语种 | 英语 |
国家 | France; USA |
英文摘要 | Aftershocks region have been extensively reported to expand logarithmically with time. The associated migration velocity is typically of the order of several km/decade but can be much larger, especially when observing early aftershock sequences, seismic swarms, or tremors. We present here a model for the expansion of aftershock zones based on the idea that aftershocks are triggered as afterslip grows with time along the fault. One of the model assumptions is that aftershocks are triggered when a critical level of afterslip is reached. We predict that the migration velocity V-p at time t following the mainshock is given by V-p = zeta A'/Delta X-tau c/t, where A' is a frictional parameter, Delta tau a characteristic value for the stress perturbation, c the radius of the stress perturbation, and zeta a constant of order unity. The scaling V-p alpha 1/t implies a logarithmic expansion of the aftershock zone with time. The migration velocities predicted by our model are in quantitative agreement with the observations reported following aftershock sequence of small and large earthquakes in various tectonic settings, seismic swarms, and tremor sequences. Plain Language Summary Aftershocks are shown to migrate with time away from the rupture area of the mainshock. This migration typically occurs as the logarithm of time. We present here a model based on the idea that afterslip drives aftershocks. The model is able to predict the migration as the logarithm of time, predicting apparent propagation velocities consistent with the observations. The propagation velocity is simply related to the physical parameters of the model. |
英文关键词 | aftershocks afterslip migration rate strengthening rheology |
领域 | 气候变化 |
收录类别 | SCI-E |
WOS记录号 | WOS:000428402400019 |
WOS关键词 | TOHOKU-OKI EARTHQUAKE ; POSTSEISMIC DEFORMATION ; POSSIBLE MECHANISM ; SPATIAL VARIATIONS ; AREA EXPANSION ; ZONE ; CALIFORNIA ; TAIWAN ; CHILE ; CREEP |
WOS类目 | Geosciences, Multidisciplinary |
WOS研究方向 | Geology |
引用统计 | |
文献类型 | 期刊论文 |
条目标识符 | http://119.78.100.173/C666/handle/2XK7JSWQ/27507 |
专题 | 气候变化 |
作者单位 | 1.Univ Grenoble Alpes, ISTerre, IRD, CNRS, Grenoble, France; 2.MIT, Dept Earth Atmospher & Planetary Sci, Cambridge, MA USA; 3.Univ Southern Calif, Dept Earth Sci, Los Angeles, CA USA |
推荐引用方式 GB/T 7714 | Perfettini, H.,Frank, W. B.,Marsan, D.,et al. A Model of Aftershock Migration Driven by Afterslip[J]. GEOPHYSICAL RESEARCH LETTERS,2018,45(5):2283-2293. |
APA | Perfettini, H.,Frank, W. B.,Marsan, D.,&Bouchon, M..(2018).A Model of Aftershock Migration Driven by Afterslip.GEOPHYSICAL RESEARCH LETTERS,45(5),2283-2293. |
MLA | Perfettini, H.,et al."A Model of Aftershock Migration Driven by Afterslip".GEOPHYSICAL RESEARCH LETTERS 45.5(2018):2283-2293. |
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