气候变化领域集成服务门户(CCPortal): Seasonal Seismicity in the Western Branch of the East African Rift System

CCPortal

DOI	10.1029/2019GL085882
	Seasonal Seismicity in the Western Branch of the East African Rift System
	Xue L.; Johnson C.W.; Fu Y.; Bürgmann R.
发表日期	2020
ISSN	0094-8276
卷号	47 期号:6
英文摘要	Surface load variations from large water bodies alter the state of stress on faults and potentially affect earthquake nucleation processes. We report observational evidence for seasonal variations of seismicity on the border faults of the western branch in the East African Rift System. Relying on water level changes of Lake Victoria and the surrounding rift lakes and soil moisture from the Global Land Data Assimilation System model, we calculate the crustal stress changes using a finite element model. Our results suggest the seasonal hydrological variations produce a 0.2–0.8 kPa Coulomb stress change on the border faults. The primary annual peak in seismicity is coincident with the peak Coulomb stress with an insignificant time lag. The correlation suggests seasonal variations of seismicity rates in the western branch of East African Rift System are modulated by the hydrological loading from Lake Victoria and the large rift lakes in the surrounding region. ©2020. American Geophysical Union. All Rights Reserved.
英文关键词	Geologic models; Soil moisture; Water levels; Coulomb stress; Lake Victoria; Rift systems; Seasonal variation; seismicity; Surface loading; Lakes; Coulomb criterion; data assimilation; earthquake; finite element method; loading; nucleation; numerical model; seasonal variation; seismicity; soil moisture; East African Lakes; East African Rift; Lake Victoria
语种	英语
来源期刊	Geophysical Research Letters
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/170581
作者单位	School of Earth, Environment and Society, Bowling Green State University, Bowling Green, OH, United States; Scripps Institution of Oceanography, University of California San Diego, La Jolla, CA, United States; Department of Earth and Planetary Science and Berkeley Seismological Laboratory, University of California Berkeley, Berkeley, CA, United States
推荐引用方式 GB/T 7714	Xue L.,Johnson C.W.,Fu Y.,et al. Seasonal Seismicity in the Western Branch of the East African Rift System[J],2020,47(6).
APA	Xue L.,Johnson C.W.,Fu Y.,&Bürgmann R..(2020).Seasonal Seismicity in the Western Branch of the East African Rift System.Geophysical Research Letters,47(6).
MLA	Xue L.,et al."Seasonal Seismicity in the Western Branch of the East African Rift System".Geophysical Research Letters 47.6(2020).