气候变化领域集成服务门户(CCPortal): Slow Slip and Inter-transient Locking on the Nicoya Megathrust in the Late and Early Stages of an Earthquake Cycle

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DOI	10.1029/2020JB020503
	Slow Slip and Inter-transient Locking on the Nicoya Megathrust in the Late and Early Stages of an Earthquake Cycle
	Xie S.; Dixon T.H.; Malservisi R.; Jiang Y.; Protti M.; Muller C.
发表日期	2020
ISSN	21699313
卷号	125 期号:11
英文摘要	We analyzed continuous GPS data collected from 2002–2020 to characterize slow slip events (SSEs) in and near the Nicoya Peninsula, Costa Rica. These data are bisected by the 5 September 2012 Mw 7.6 earthquake. The displacement time series contain multiple signals, including plate convergence, plate interface locking, coseismic and postseismic deformation, seasonal oscillations, SSEs, and noise. GPS-measured coseismic and postseismic displacements associated with the Mw 7.6 earthquake are modeled and removed by a step function plus multiple timescale relaxation processes with four characteristic times: 11, 94, 470, and 1,865 days. Seasonal oscillations are eliminated using a multichannel singular spectrum analysis (M-SSA). Ten major SSEs (Mw > 6.6) are observed in the remaining time series, with a constant recurrence interval of 21.7 ± 2.6 months. SSEs occur in both shallow (~10 km) and deep (~35 km) portions of the plate interface, but the latter last longer and have larger magnitudes. There is minimum to no slow slip in the Mw 7.6 seismic rupture area and a persistent slow slip patch beneath the Nicoya Gulf entrance. Despite strong earthquake-related stress perturbations, the inter-SSE locking status on the megathrust is very similar between the late and early stages of the earthquake cycle and includes locked patches that ruptured in the 2012 earthquake or continue to rupture via SSEs. Some locked patches offshore south of the Nicoya Peninsula did not rupture in 2012, do not participate in SSEs, and may be indicative of supercycle behavior, that is, strain accumulation over several seismic cycles. These areas warrant heightened monitoring. ©2020. American Geophysical Union. All Rights Reserved.
英文关键词	Costa Rica; Global Positioning System; locking; megathrust earthquake; slow slip event; subduction zone
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/187491
作者单位	School of Geosciences, University of South Florida, Tampa, FL, United States; Scripps Institution of Oceanography, University of California, San Diego, La Jolla, CA, United States; Geological Survey of Canada, Natural Resources Canada, Sidney, Canada; School of Earth and Ocean Sciences, University of Victoria, Victoria, Canada; Observatorio Vulcanológico y Sismológico de Costa Rica, Universidad Nacional, Heredia, Costa Rica
推荐引用方式 GB/T 7714	Xie S.,Dixon T.H.,Malservisi R.,et al. Slow Slip and Inter-transient Locking on the Nicoya Megathrust in the Late and Early Stages of an Earthquake Cycle[J],2020,125(11).
APA	Xie S.,Dixon T.H.,Malservisi R.,Jiang Y.,Protti M.,&Muller C..(2020).Slow Slip and Inter-transient Locking on the Nicoya Megathrust in the Late and Early Stages of an Earthquake Cycle.Journal of Geophysical Research: Solid Earth,125(11).
MLA	Xie S.,et al."Slow Slip and Inter-transient Locking on the Nicoya Megathrust in the Late and Early Stages of an Earthquake Cycle".Journal of Geophysical Research: Solid Earth 125.11(2020).