气候变化领域集成服务门户(CCPortal): Evidence for Fluid Migration During the 2016 Meinong, Taiwan, Aftershock Sequence

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DOI	10.1029/2020JB019994
	Evidence for Fluid Migration During the 2016 Meinong, Taiwan, Aftershock Sequence
	Hsu Y.-F.; Huang H.-H.; Huang M.-H.; Tsai V.C.; Chuang R.Y.; Feng K.-F.; Lin S.-H.
发表日期	2020
ISSN	21699313
卷号	125 期号:9
英文摘要	An important question of earthquake science is to what extent fluids such as water play an important role in modulating seismicity. While many models of earthquake rupture assume that fluids are critical for dynamic weakening during slip and evidence for fluids is well documented for shallow injection-induced or hydrothermally induced earthquakes, there has been limited conclusive evidence for the role of fluids for tectonic earthquakes in the middle-to-lower crust. Here, we provide evidence for fluid migration during the 2016 Meinong, Taiwan, aftershock sequence, occurring at 10–20 km depth within a classic fold-and-thrust belt. We find high Vp/Vs ratios, characteristic of highly fluid saturated regions, in the Meinong aftershock region and that the Vp/Vs ratios in the central aftershock region change with time during the aftershock sequence. The central aftershock sequence distinguishes itself from other aftershocks by having a swarm-like magnitude distribution and aftershock decay rate, as well as a slower migration rate that may be related to fluid diffusion. The estimated permeability (~3.8 × 10−15 m2) and temporal changes in Vp/Vs suggest that moderate earthquakes may be able to strongly affect permeabilities in the midcrust. The results also suggest that fluid processes play a critical role in regulating seismicity in a classic continental collision tectonic setting and may also have a role in modifying earthquake hazards more generally. © 2020. American Geophysical Union. All Rights Reserved.
英文关键词	aftershock sequence; crustal permeability; fluid migration; Meinong earthquake; Vp/Vs ratio
语种	英语
来源期刊	Journal of Geophysical Research: Solid Earth
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/187598
作者单位	Department of Geography, National Taiwan University, Taipei, Taiwan; Institute of Earth Sciences, Academia Sinica, Taipei, Taiwan; Department of Geology, University of Maryland, College ParkMD, United States; Department of Earth, Environmental and Planetary Sciences, Brown University, Providence, RI, United States; Department of Geosciences, National Taiwan University, Taipei, Taiwan; Central Geological Survey, New Taipei City, Taiwan
推荐引用方式 GB/T 7714	Hsu Y.-F.,Huang H.-H.,Huang M.-H.,et al. Evidence for Fluid Migration During the 2016 Meinong, Taiwan, Aftershock Sequence[J],2020,125(9).
APA	Hsu Y.-F..,Huang H.-H..,Huang M.-H..,Tsai V.C..,Chuang R.Y..,...&Lin S.-H..(2020).Evidence for Fluid Migration During the 2016 Meinong, Taiwan, Aftershock Sequence.Journal of Geophysical Research: Solid Earth,125(9).
MLA	Hsu Y.-F.,et al."Evidence for Fluid Migration During the 2016 Meinong, Taiwan, Aftershock Sequence".Journal of Geophysical Research: Solid Earth 125.9(2020).