DOI: 10.1007/s00531-013-0960-y
论文题名: Seismic swarms, fluid flow and hydraulic conductivity in the forearc offshore North Costa Rica and Nicaragua
作者: Thorwart M. ; Dzierma Y. ; Rabbel W. ; Hensen C.
刊名: International Journal of Earth Sciences
出版年: 2014
卷: 103, 期: 7 起始页码: 1789
结束页码: 1799
语种: 英语
英文关键词: Central American subduction zone
; Diffusivity
; Earthquake swarms
; Permeability
Scopus关键词: aftershock
; Cocos plate
; continental margin
; diffusivity
; earthquake swarm
; fluid flow
; forearc basin
; hydraulic conductivity
; permeability
; seismic zone
; seismicity
; spatiotemporal analysis
; subduction zone
; Costa Rica
; Nicaragua
英文摘要: At the continental margin of north Costa Rica and Nicaragua, the strongly hydrated Cocos Plate subducts beneath the Caribbean Plate. From the downgoing Cocos plate fluids are released through extensional fractures in the overriding plate. At the seafloor, they form fluid seeps, mounds and other types of fluid expulsion. Using an offshore temporary seismic network, we investigated seismicity possibly related to these processes and observed several swarms of earthquakes located on the continental slope trenchward of the seismogenic zone of S Nicaragua. The seismicity occurred within the downgoing plate, near the plate interface and in the overriding plate. We interpret these swarm events as an expression of pore pressure propagation under critical stress conditions driven by fluid release from the downgoing plate. In order to estimate hydraulic diffusivity and permeability values, we applied a theory developed for injection test interpretation to the spatio-temporal development of the swarms. The resulting diffusivity and permeability values are in the ranges of 28–305 m²/s and 3.2 × 10−14 m²–35.1 × 10−14 m², respectively, applying to the continental and oceanic crust near the plate interface. These values are somewhat larger than observed in drill logs on the margin wedge off north Costa Rica, but of comparable magnitude to values estimated for the Antofagasta 1995 earthquake aftershock sequence. © 2013, Springer-Verlag Berlin Heidelberg. URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84908519422&doi=10.1007%2fs00531-013-0960-y&partnerID=40&md5=5df3347f06822665bbb1ec07db60e8be
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/70340
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: SFB 574, Department of Geophysics, Institute of Geosciences, Christian-Albrechts-Universität, Otto-Hahn-Platz 1, Kiel, Germany; SFB 574, GEOMAR Helmholtz-Zentrum für Ozeanforschung Kiel, Wischhofstrasse 1-3, Kiel, Germany
Recommended Citation:
Thorwart M.,Dzierma Y.,Rabbel W.,et al. Seismic swarms, fluid flow and hydraulic conductivity in the forearc offshore North Costa Rica and Nicaragua[J]. International Journal of Earth Sciences,2014-01-01,103(7)