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DOI | 10.1029/2019GL082254 |
Snowmelt-Triggered Earthquake Swarms at the Margin of Long Valley Caldera, California | |
Montgomery-Brown, E. K.1; Shell, D. R.2; Hsieh, P. A.3 | |
2019-04-16 | |
发表期刊 | GEOPHYSICAL RESEARCH LETTERS |
ISSN | 0094-8276 |
EISSN | 1944-8007 |
出版年 | 2019 |
卷号 | 46期号:7页码:3698-3705 |
文章类型 | Article |
语种 | 英语 |
国家 | USA |
英文摘要 | Fluids are well known to influence earthquakes, yet rarely are earthquakes convincingly linked to precipitation. Weak modulation or limited data often leads to ambiguous interpretations. In contrast, here we find that shallow seismicity in the Sierra Nevada range near Long Valley Caldera is strongly modulated by snowmelt. Over 33years, shallow seismicity rates were similar to 37 times higher during very wet periods versus very dry periods. Relative earthquake relocations from a swarm in 2017 reveal downward migration from similar to 1- to 3-km depth along a steeply inclined plane. Steeply dipping strata may provide high-permeability pathways and faulting plane. Here we combine the correlated seismicity and hydrologic time series with the propagation observed in the relatively relocated earthquakes. From this combined evidence, we infer that pressure diffusion from groundwater recharge dramatically accelerated shallow seismicity rates, causing seismic swarms unrelated to volcanic processes. Plain Language Summary Water from melting snow in the mountains near Long Valley Caldera filters down along upturned metasedimentary layers and triggers earthquake swarms. Earthquake locations show that the swarms propagate downward; the same direction as the infiltrating water and opposite from other nearby volcanic earthquake swarms. Over a 33-year record of stream flow and earthquake data, the earthquakes are similar to 37 times more active during wet periods than dry periods. This amount of increase is substantially larger than other regions where similar triggering has been documented. Combining the long-term correlation of the stream flow and earthquakes, with the downward propagating swarm we infer that pressure diffusion from the spring groundwater recharge dramatically increases the seismicity rates. |
英文关键词 | earthquake swarm triggered seismicity earthquake relocation groundwater recharge snowmelt |
领域 | 气候变化 |
收录类别 | SCI-E |
WOS记录号 | WOS:000465836200014 |
WOS关键词 | MT. HOCHSTAUFEN ; FAULT STRUCTURE ; SIERRA-NEVADA ; SEISMICITY ; EVOLUTION |
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/182362 |
专题 | 气候变化 |
作者单位 | 1.US Geol Survey, Calif Volcano Observ, Menlo Pk, CA 94025 USA; 2.US Geol Survey, Geol Hazards Sci Ctr, Golden, CO USA; 3.US Geol Survey, Water Mission Area, Menlo Pk, CA USA |
推荐引用方式 GB/T 7714 | Montgomery-Brown, E. K.,Shell, D. R.,Hsieh, P. A.. Snowmelt-Triggered Earthquake Swarms at the Margin of Long Valley Caldera, California[J]. GEOPHYSICAL RESEARCH LETTERS,2019,46(7):3698-3705. |
APA | Montgomery-Brown, E. K.,Shell, D. R.,&Hsieh, P. A..(2019).Snowmelt-Triggered Earthquake Swarms at the Margin of Long Valley Caldera, California.GEOPHYSICAL RESEARCH LETTERS,46(7),3698-3705. |
MLA | Montgomery-Brown, E. K.,et al."Snowmelt-Triggered Earthquake Swarms at the Margin of Long Valley Caldera, California".GEOPHYSICAL RESEARCH LETTERS 46.7(2019):3698-3705. |
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