DOI: 10.1007/s00531-013-0955-8
论文题名: The seismogenic zone in the Central Costa Rican Pacific margin: high-quality hypocentres from an amphibious network
作者: Arroyo I.G. ; Husen S. ; Flueh E.R.
刊名: International Journal of Earth Sciences
出版年: 2014
卷: 103, 期: 7 起始页码: 1747
结束页码: 1764
语种: 英语
英文关键词: Earthquake location
; Seamount subduction
; Seismogenic zone
; Subduction
Scopus关键词: earthquake event
; earthquake hypocenter
; earthquake magnitude
; oceanic crust
; P-wave
; plate boundary
; seamount
; seismic velocity
; seismic zone
; seismicity
; subduction
; Costa Rican Margin
; Pacific Ocean
英文摘要: Transition from subduction of normal to thickened oceanic crust occurs in the central portion of the Costa Rican margin, where large interplate earthquakes (M ~ 7) and abundant interseismic seismicity have been associated with subduction of bathymetric highs. We relocated ~1,300 earthquakes recorded for 6 months by a combined on- and offshore seismological network using probabilistic earthquake relocation in a 3D P-wave velocity model. Most of the seismicity originated at the seismogenic zone of the plate boundary, appearing as an 18° dipping, planar cluster from 15 to 25–30 km depth, beneath the continental shelf. Several reverse focal mechanisms were resolved within the cluster. The upper limit of this interseismic interplate seismicity seems to be controlled primarily by the overlying-plate thickness and coherency, which in turn is governed by the erosional processes and fluid release and escape at temperatures lower than ~100 to 120 °C along the plate boundary. The downdip limit of the stick–slip behaviour collocates with relative low temperatures of ~150 to 200 °C, suggesting that it is controlled by serpentinization of the mantle wedge. The distribution of the interseismic interplate seismicity is locally modified by the presence of subducted seamounts at different depths. Unlike in northern Costa Rica, rupture of large earthquakes in the last two decades seems to coincide with the area defined by the interseismic interplate seismicity. © 2013, Springer-Verlag Berlin Heidelberg. URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84908568195&doi=10.1007%2fs00531-013-0955-8&partnerID=40&md5=b1581b1f3a8f6af7f034f43c2edf039f
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/70421
Appears in Collections: 影响、适应和脆弱性 气候减缓与适应
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作者单位: Helmholtz-Zentrum für Ozeanforschung (GEOMAR), Kiel, Schleswig-Holstein, Germany; SFB574, Kiel, Germany; Swiss Federal Institute of Technology Zurich, ETH Hoenggerberg, Zurich, Switzerland
Recommended Citation:
Arroyo I.G.,Husen S.,Flueh E.R.. The seismogenic zone in the Central Costa Rican Pacific margin: high-quality hypocentres from an amphibious network[J]. International Journal of Earth Sciences,2014-01-01,103(7)