气候变化领域集成服务门户(CCPortal): The 2017 Mw 5.5 Pohang Earthquake, South Korea, and Poroelastic Stress Changes Associated With Fluid Injection

CCPortal

DOI	10.1029/2019JB019134
	The 2017 Mw 5.5 Pohang Earthquake, South Korea, and Poroelastic Stress Changes Associated With Fluid Injection
	Lim H.; Deng K.; Kim Y.H.; Ree J.-H.; Song T.R.A.; Kim K.-H.
发表日期	2020
ISSN	21699313
卷号	125 期号:6
英文摘要	The 2017 Mw 5.5 Pohang earthquake in South Korea, the first reported and largest magnitude-induced earthquake, occurred near the enhanced geothermal power plant in Pohang on 15 November 2017. We compute the spatiotemporal changes in poroelastic stresses perturbed by injected fluid under various conditions to better understand the occurrences of the Pohang earthquake and the small-magnitude earthquakes preceding it. Space-time variation of the earthquakes that occurred before the Pohang earthquake correlates significantly with fluid injection history between January 2016 and September 2017. We attribute the timing in earthquake occurrence to slow fluid diffusion, making hydraulic diffusivity of bedrock the critical model parameter for representing this slow process. In this context, the delay between the injection and the Pohang earthquake requires diffusivity estimates within a range of 1 × 10−4–5 × 10−4 m2/s for damaged granodiorite at 4–5 km, corresponding to the depth range between the well and the focal depth. According to these estimates, the pore pressure and thus the Coulomb failure stress changes are further enhanced by each injection with minimum stress dissipation. We find fluid injection can result in a change of the Coulomb stress of up to 0.4–1.1 bar, exceeding those associated with the 2016 Mw 5.5 Gyeongju earthquake by 2 orders of magnitude. ©2020. American Geophysical Union. All Rights Reserved.
英文关键词	2017 Pohang earthquake, South Korea; Coulomb stress change; enhanced geothermal system; induced earthquake; pore pressure; poroelastic modeling
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/187806
作者单位	School of Earth and Environmental Sciences, Seoul National University, Seoul, South Korea; College of Geophysics, Chengdu University of Technology, Chengdu, China; Department of Earth and Environmental Sciences, Korea University, Seoul, South Korea; Department of Earth Sciences, University College London, London, United Kingdom; Department of Geological Science, Pusan National University, Busan, South Korea
推荐引用方式 GB/T 7714	Lim H.,Deng K.,Kim Y.H.,et al. The 2017 Mw 5.5 Pohang Earthquake, South Korea, and Poroelastic Stress Changes Associated With Fluid Injection[J],2020,125(6).
APA	Lim H.,Deng K.,Kim Y.H.,Ree J.-H.,Song T.R.A.,&Kim K.-H..(2020).The 2017 Mw 5.5 Pohang Earthquake, South Korea, and Poroelastic Stress Changes Associated With Fluid Injection.Journal of Geophysical Research: Solid Earth,125(6).
MLA	Lim H.,et al."The 2017 Mw 5.5 Pohang Earthquake, South Korea, and Poroelastic Stress Changes Associated With Fluid Injection".Journal of Geophysical Research: Solid Earth 125.6(2020).