气候变化领域集成服务门户(CCPortal): The Role of Seismic and Slow Slip Events in Triggering the 2018 M7.1 Anchorage Earthquake in the Southcentral Alaska Subduction Zone

CCPortal

DOI	10.1029/2019GL086640
	The Role of Seismic and Slow Slip Events in Triggering the 2018 M7.1 Anchorage Earthquake in the Southcentral Alaska Subduction Zone
	Segou M.; Parsons T.
发表日期	2020
ISSN	0094-8276
卷号	47 期号:10
英文摘要	The M7.1 2018 Anchorage earthquake occurred in the bending part of the subducting North Pacific plate near the geometrical barrier formed by the underthrusting Yakutat terrane. We calculate the triggering potential related with stress redistribution from deformation sources including the M9.2 1964 earthquake coseismic slip, postseismic deformation, slip from regional M > 5 earthquakes, and the cumulative slip of previously detected slow slip events over the past 55 years. We investigate the deeper shallow depth (20–60 km) seismicity response to these perturbations using an epidemic type aftershock sequence model to describe earthquake-to-earthquake interactions. The statistical forecast captures the triggered seismicity during the 1983 M6+ aftershocks in Columbia Bay but performs poorly during the slow slip event period between 1992.0 and 2004.8 that presents a statistically significant rate change (β, Z > 2; M < 4.0). We find that stress effects from the 1964 postseismic source and the 12-year-long slow slip event (~M7.8) contribute to the 2018 Anchorage earthquake occurrence and that slow slip events modulate the deeper shallow depth seismicity patterns in the region. ©2020. American Geophysical Union. All Rights Reserved.
英文关键词	Anchorages (foundations); Deformation; Earthquake effects; Coseismic slips; Earthquake occurrences; Epidemic-type aftershock sequences; Postseismic deformation; Seismicity pattern; Slow slip events; Stress redistribution; Subduction zones; Anchorage zones; aftershock; bending; deformation mechanism; earthquake event; Pacific plate; seismic response; slip rate; subduction zone; Alaska; Atlantic Ocean; Columbia Basin; Pacific Ocean; Pacific Ocean (North); United States; Yakutat Seamount
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/170323
作者单位	The Lyell Centre, British Geological Survey, Edinburgh, United Kingdom; U.S. Geological Survey, Menlo Park, CA, United States
推荐引用方式 GB/T 7714	Segou M.,Parsons T.. The Role of Seismic and Slow Slip Events in Triggering the 2018 M7.1 Anchorage Earthquake in the Southcentral Alaska Subduction Zone[J],2020,47(10).
APA	Segou M.,&Parsons T..(2020).The Role of Seismic and Slow Slip Events in Triggering the 2018 M7.1 Anchorage Earthquake in the Southcentral Alaska Subduction Zone.Geophysical Research Letters,47(10).
MLA	Segou M.,et al."The Role of Seismic and Slow Slip Events in Triggering the 2018 M7.1 Anchorage Earthquake in the Southcentral Alaska Subduction Zone".Geophysical Research Letters 47.10(2020).