Climate Change Data Portal
| DOI | 10.1016/j.tecto.2021.228720 |
| The 2014 Juan Fernández microplate earthquake doublet: Evidence for large thrust faulting driven by microplate rotation | |
| Cesca S.; Valenzuela Malerán C.; López-Comino J.Á.; Davis T.; Tassara C.; Oncken O.; Dahm T. | |
| 发表日期 | 2021 |
| ISSN | 00401951 |
| 卷号 | 801 |
| 英文摘要 | On October 9, 2014, a Mw 7.1–6.7 seismic doublet occurred at the Juan Fernández microplate, close to the triple junction with Pacific and Nazca plates. The Mw 7.1 earthquake is the largest earthquake ever to have been recorded in the region. Its thrust focal mechanism is also unusual for the region, although the northern part of the microplate is expected to undergo compression. The region is remote and seismological data is limited to a seismic station at ~600 km distance on Easter Island and teleseismic observations for the largest events. We use a combination of advanced seismological techniques to overcome the lack of local data and resolve earthquake source parameters for the doublet and its aftershock sequence, being able to reconstruct the chronology of the sequence and the geometry of affected fault segments. Our results depict a complex seismic sequence characterized by the interplay of thrust and strike-slip earthquakes along different structures, including a second, reversed strike slip-thrust seismic doublet in November 2014. Seismicity occurred within the microplate and only in the late part of the sequence migrated northward, towards the microplate boundary. The first largest doublet, whose rupture kinematic is well explained by stress changes imparted by the first subevent on the second one, may have activated unmapped E-W and NE-SW faults or an internal curved pseudofault, attributed to the long-term rotation of the microplate. Few large, thrust earthquakes are observed within the sequence, taking place in the vicinity of mapped compressional ridges. We suggest that compressional stresses in the northern part of the microplate and at its boundary are partially accommodated aseismically. However, the occasional occurrence of large, impulsive thrust earthquakes, with a considerable tsunamigenic potential, poses a relevant hazard for islands in the South Pacific region. © 2021 The Author(s) |
| 关键词 | Juan Fernández microplateMoment tensorRupture directivitySeismic doublet |
| 英文关键词 | Faulting; Aftershock sequence; Different structure; Earthquake source parameters; Microplate rotation; Seismic sequence; Seismological data; Strike-slip earthquakes; Tsunamigenic potential; Earthquakes; aftershock; earthquake event; earthquake rupture; fault geometry; focal mechanism; microplate; moment tensor; source parameters; tectonic rotation; thrust fault; Pacific Ocean; Pacific Ocean (South); Dimeresia howellii |
| 语种 | 英语 |
| 来源期刊 | Tectonophysics
 |
| 文献类型 | 期刊论文 |
| 条目标识符 | http://gcip.llas.ac.cn/handle/2XKMVOVA/207954 |
| 作者单位 | Helmholtz-Zentrum Potsdam Deutsches GeoForschungsZentrum, Potsdam, Germany; Institute of Earth and Environmental Sciences, University of Potsdam, Potsdam, Germany; Instituto Andaluz de Geofísica, Universidad de Granada, Granada, Spain; Departamento de Física Teórica y del Cosmos, Universidad de Granada, Granada, Spain; Universidad Nacional Arturo Prat, Iquique, Chile |
| 推荐引用方式 GB/T 7714 | Cesca S.,Valenzuela Malerán C.,López-Comino J.Á.,et al. The 2014 Juan Fernández microplate earthquake doublet: Evidence for large thrust faulting driven by microplate rotation[J],2021,801. |
| APA | Cesca S..,Valenzuela Malerán C..,López-Comino J.Á..,Davis T..,Tassara C..,...&Dahm T..(2021).The 2014 Juan Fernández microplate earthquake doublet: Evidence for large thrust faulting driven by microplate rotation.Tectonophysics,801. |
| MLA | Cesca S.,et al."The 2014 Juan Fernández microplate earthquake doublet: Evidence for large thrust faulting driven by microplate rotation".Tectonophysics 801(2021). |
| 条目包含的文件 | 条目无相关文件。 | |||||
除非特别说明，本系统中所有内容都受版权保护，并保留所有权利。
