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DOI | 10.1002/2016GL072088 |
Near-continuous tremor and low-frequency earthquake activities in the Alaska-Aleutian subduction zone revealed by a mini seismic array | |
Li, Bo; Ghosh, Abhijit | |
2017-06-16 | |
发表期刊 | GEOPHYSICAL RESEARCH LETTERS |
ISSN | 0094-8276 |
EISSN | 1944-8007 |
出版年 | 2017 |
卷号 | 44期号:11 |
文章类型 | Article |
语种 | 英语 |
国家 | USA |
英文摘要 | Tectonic tremor and low-frequency earthquakes (LFEs) are relatively poorly studied in the Alaska-Aleutian subduction zone due to the limited data availability, difficult logistics, and rugged terrain. Using 2months of continuous data recorded by a mini seismic array in the Akutan Island, we detect near-continuous tremor activity with an average of 1.3h of tectonic tremor per day using a beam backprojection method. Tremor sources are clustered in two patches with an similar to 25km gap in between them. In addition, we visually identify three low-frequency earthquakes, and using them as templates, we detect similar to 1300 additional LFEs applying a matched-filter method. Tremor and LFE activities agree well in space and time, and LFEs show a much smaller recurrence interval during tremor than during non-tremor time periods. Tremor sources propagate both along the strike and dip directions of the subduction fault with velocities ranging between 13 and 110km/h. Prolific patchy tremor and LFE activities suggest lateral heterogeneity in the locked to freely slipping transition zone, indicating that slow earthquakes may play an important role in the earthquake cycles in this subduction zone. |
英文关键词 | tremors LFEs Alaska-Aleutian subduction zone migration mini array |
领域 | 气候变化 |
收录类别 | SCI-E |
WOS记录号 | WOS:000404382600022 |
WOS关键词 | NONVOLCANIC TREMOR ; EPISODIC TREMOR ; SLIP ; CASCADIA ; JAPAN |
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/27102 |
专题 | 气候变化 |
作者单位 | Univ Calif Riverside, Dept Earth Sci, Riverside, CA 92521 USA |
推荐引用方式 GB/T 7714 | Li, Bo,Ghosh, Abhijit. Near-continuous tremor and low-frequency earthquake activities in the Alaska-Aleutian subduction zone revealed by a mini seismic array[J]. GEOPHYSICAL RESEARCH LETTERS,2017,44(11). |
APA | Li, Bo,&Ghosh, Abhijit.(2017).Near-continuous tremor and low-frequency earthquake activities in the Alaska-Aleutian subduction zone revealed by a mini seismic array.GEOPHYSICAL RESEARCH LETTERS,44(11). |
MLA | Li, Bo,et al."Near-continuous tremor and low-frequency earthquake activities in the Alaska-Aleutian subduction zone revealed by a mini seismic array".GEOPHYSICAL RESEARCH LETTERS 44.11(2017). |
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