globalchange  > 气候减缓与适应
DOI: 10.1038/ngeo2620
论文题名:
A mixed seismic-aseismic stress release episode in the Andean subduction zone
作者: Villegas-Lanza J.C.; Nocquet J.-M.; Rolandone F.; Vallee M.; Tavera H.; Bondoux F.; Tran T.; Martin X.; Chlieh M.
刊名: Nature Geoscience
ISSN: 17520894
出版年: 2016
卷: 9, 期:2
起始页码: 150
结束页码: 154
语种: 英语
Scopus关键词: earthquake event ; earthquake magnitude ; earthquake swarm ; GPS ; identification method ; seismic moment ; seismicity ; slip ; stress field ; subduction zone ; Andes ; Peru
英文摘要: In subduction zones, stress is released by earthquakes and transient aseismic slip. The latter falls into two categories: slow slip and afterslip. Slow-slip events emerge spontaneously during the interseismic phase, and show a progressive acceleration of slip with a negligible contribution of synchronous tremors or microseismicity to the energy, or moment release. In contrast, afterslip occurs immediately after large and moderate earthquakes, decelerates over time, and releases between 20 and 400% of the moment released by the preceding earthquake. Here we use seismic and GPS data to identify transient aseismic slip that does not fit into either of these categories. We document a seismic-aseismic slip sequence which occurred at shallow depths along a weakly coupled part of the Andean subduction zone in northern Peru and lasted seven months. The sequence generated several moderate earthquakes that together account for about 25% of the total moment released during the full sequence, equivalent to magnitude 6.7. Transient slip immediately followed two of the earthquakes, with slip slowing at a logarithmic rate. Considered separately, the moment released by transient slip following the second earthquake was more than 1,000% of the moment released during the earthquake itself, a value incompatible with classical models of afterslip. Synchronous seismic swarms and aseismic slip may therefore define a stress-release process that is distinct from slow-slip events and afterslip. © 2016 Macmillan Publishers Limited.
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/106080
Appears in Collections:气候减缓与适应
科学计划与规划

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作者单位: Instituto Geofísico Del Perú, Urbanización Mayorazgo IV Etapa, Calle Badajoz 169, P-Lima, Peru; IRD, Université de Nice Sophia-Antipolis, Observatoire de la Côte d'Azur, 250 rue A. Einstein, Valbonne, France; Sorbonne Universités, Institut des Sciences de la Terre de Paris, 4 Place Jussieu, Paris, France; Institut de Physique du Globe de Paris, Sorbonne Paris Cité, Université Paris Diderot, Paris-Cedex, France; Geósciences Environnement Toulouse, Université Paul Sabatier, CNRS, Toulouse, France; National University of Civil Engineering, 55 Giai Phong Road, Hai Ba Trung District, Hanoi, Viet Nam

Recommended Citation:
Villegas-Lanza J.C.,Nocquet J.-M.,Rolandone F.,et al. A mixed seismic-aseismic stress release episode in the Andean subduction zone[J]. Nature Geoscience,2016-01-01,9(2)
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