气候变化领域集成服务门户(CCPortal): Numerical Study on Earthquake Energy Partitioning: Relationships Among Radiated Energy, Seismic Moment, and Stress Drop

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DOI	10.1029/2019JB017308
	Numerical Study on Earthquake Energy Partitioning: Relationships Among Radiated Energy, Seismic Moment, and Stress Drop
	Khademian Z.; Nakagawa M.; Ozbay U.
发表日期	2020
ISSN	21699313
卷号	125 期号:1
英文摘要	This paper aims at mechanistically studying some aspects of earthquake energy partitioning with a focus on the radiated energy (Es) and seismic moment (Mo) relationships for investigating differences between estimates of average dynamic stress drop ((Formula presented.)) and static stress drop ((Formula presented.)). We evaluate to what extent a relatively simple but analytically verified faulting simulation can explain such differences. We adopt a numerical methodology developed in the 2-D Universal Distinct Element Code to simulate fault slip with slip-weakening responses. A method is introduced for recording the ground reaction to slip and from which we discuss the energy partitioning in ideal cases of rupture. We examine a shallow strike-slip fault model where a locally peaked stress is gradually developed on the fault by applying tectonic stresses away from the fault surface until a rupture is initiated locally and propagated outward. The rupture is terminated when the available energy is exhausted by the fracture energy and friction work especially as the rupture is followed by a creep. With investigating roles of the available energy for rupture and the fracture energy, we display limited cases where Mo does not, at least proportionately, scale with Es. Results show this is because Mo, compared to Es, does not fully represent the energy available for initiating a rupture and the fracture energy consumed during its propagation. That is why 2μEs/Mo and 2μEs/ηRMo estimates, with the radiation ratio ηR and rigidity μ, may significantly differ from (Formula presented.) and (Formula presented.). ©2020. American Geophysical Union. All Rights Reserved.
英文关键词	fracture energy; nonlinear slip weakening; numerical simulation; radiated energy; seismic moment; stress drop
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/188036
作者单位	Department of Mining Engineering, Colorado School of Mines, Golden, CO, United States
推荐引用方式 GB/T 7714	Khademian Z.,Nakagawa M.,Ozbay U.. Numerical Study on Earthquake Energy Partitioning: Relationships Among Radiated Energy, Seismic Moment, and Stress Drop[J],2020,125(1).
APA	Khademian Z.,Nakagawa M.,&Ozbay U..(2020).Numerical Study on Earthquake Energy Partitioning: Relationships Among Radiated Energy, Seismic Moment, and Stress Drop.Journal of Geophysical Research: Solid Earth,125(1).
MLA	Khademian Z.,et al."Numerical Study on Earthquake Energy Partitioning: Relationships Among Radiated Energy, Seismic Moment, and Stress Drop".Journal of Geophysical Research: Solid Earth 125.1(2020).