Detection of slow slip events along the southern Peru - northern Chile subduction zone

J. Jara, R. Jolivet, A. Socquet, D. Comte, E. Norabuena
{"title":"Detection of slow slip events along the southern Peru - northern Chile subduction zone","authors":"J. Jara, R. Jolivet, A. Socquet, D. Comte, E. Norabuena","doi":"10.26443/seismica.v3i1.980","DOIUrl":null,"url":null,"abstract":"Detections of slow slip events (SSEs) are now common along most plate boundary fault systems at the global scale. However, no such event has been described in the south Peru - north Chile subduction zone so far, except for the early preparatory phase of the 2014 Iquique earthquake. We use geodetic template matching on GNSS-derived time series of surface motion in Northern Chile to extract SSEs hidden within the geodetic noise. We detect 33 events with durations ranging from 9 to 40 days and magnitudes from Mw 5.6 to 6.2. The moment released by these aseismic events seems to scale with the cube of their duration, suggesting a dynamic comparable to that of earthquakes. We compare the distribution of SSEs with the distribution of coupling along the megathrust derived using Bayesian inference on GNSS- and InSAR-derived interseismic velocities. From this comparison, we obtain that most SSEs occur in regions of intermediate coupling where the megathrust transitions from locked to creeping or where geometrical complexities of the interplate region have been proposed. We finally discuss the potential role of fluids as a triggering mechanism for SSEs in the area.","PeriodicalId":509514,"journal":{"name":"Seismica","volume":" 48","pages":""},"PeriodicalIF":0.0000,"publicationDate":"2024-06-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Seismica","FirstCategoryId":"1085","ListUrlMain":"https://doi.org/10.26443/seismica.v3i1.980","RegionNum":0,"RegionCategory":null,"ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"","JCRName":"","Score":null,"Total":0}
引用次数: 0

Abstract

Detections of slow slip events (SSEs) are now common along most plate boundary fault systems at the global scale. However, no such event has been described in the south Peru - north Chile subduction zone so far, except for the early preparatory phase of the 2014 Iquique earthquake. We use geodetic template matching on GNSS-derived time series of surface motion in Northern Chile to extract SSEs hidden within the geodetic noise. We detect 33 events with durations ranging from 9 to 40 days and magnitudes from Mw 5.6 to 6.2. The moment released by these aseismic events seems to scale with the cube of their duration, suggesting a dynamic comparable to that of earthquakes. We compare the distribution of SSEs with the distribution of coupling along the megathrust derived using Bayesian inference on GNSS- and InSAR-derived interseismic velocities. From this comparison, we obtain that most SSEs occur in regions of intermediate coupling where the megathrust transitions from locked to creeping or where geometrical complexities of the interplate region have been proposed. We finally discuss the potential role of fluids as a triggering mechanism for SSEs in the area.
查看原文
分享 分享
微信好友 朋友圈 QQ好友 复制链接
本刊更多论文
探测秘鲁南部-智利北部俯冲带的缓慢滑动事件
目前,在全球范围内,大多数板块边界断层系统都会检测到慢滑事件(SSE)。然而,除了 2014 年伊基克地震的早期准备阶段,迄今为止秘鲁南部-智利北部俯冲带还没有发生过此类事件。我们在智利北部地表运动的全球导航卫星系统衍生时间序列上使用大地测量模板匹配,以提取隐藏在大地测量噪声中的 SSE。我们检测到 33 个事件,持续时间从 9 到 40 天不等,震级从 5.6 到 6.2 级不等。这些非地震事件释放的力矩似乎与其持续时间的立方成正比,表明其动态与地震相当。我们将自震事件的分布与利用贝叶斯推断法对全球导航卫星系统(GNSS)和 InSAR 测得的震间速度推断出的大地壳沿线耦合分布进行了比较。通过比较,我们得出大多数 SSE 发生在大地壳从锁定向蠕动过渡的中间耦合区域,或者板块间区域的几何复杂性被提出的区域。最后,我们讨论了流体作为该地区 SSE 触发机制的潜在作用。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
求助全文
约1分钟内获得全文 去求助
来源期刊
自引率
0.00%
发文量
0
期刊最新文献
Seismic characteristics of the 2022-2023 unrest episode at Taupō volcano, Aotearoa New Zealand Refined Holocene Slip Rate for the Western and Central Segments of the Garlock Fault: Record of Alternating Millennial-Scale Periods of Fast and Slow Fault Slip Forearc faults in northern Cascadia do not accommodate elastic strain driven by the megathrust seismic cycle Detection of slow slip events along the southern Peru - northern Chile subduction zone Along-strike changes in ETS behavior near the slab edge of Southern Cascadia
×
引用
GB/T 7714-2015
复制
MLA
复制
APA
复制
导出至
BibTeX EndNote RefMan NoteFirst NoteExpress
×
×
提示
您的信息不完整,为了账户安全,请先补充。
现在去补充
×
提示
您因"违规操作"
具体请查看互助需知
我知道了
×
提示
现在去查看 取消
×
提示
确定
0
微信
客服QQ
Book学术公众号 扫码关注我们
反馈
×
意见反馈
请填写您的意见或建议
请填写您的手机或邮箱
已复制链接
已复制链接
快去分享给好友吧!
我知道了
×
扫码分享
扫码分享
Book学术官方微信
Book学术文献互助
Book学术文献互助群
群 号:481959085
Book学术
文献互助 智能选刊 最新文献 互助须知 联系我们:info@booksci.cn
Book学术提供免费学术资源搜索服务,方便国内外学者检索中英文文献。致力于提供最便捷和优质的服务体验。
Copyright © 2023 Book学术 All rights reserved.
ghs 京公网安备 11010802042870号 京ICP备2023020795号-1