globalchange  > 气候变化与战略
DOI: 10.1016/j.epsl.2021.116875
论文题名:
Non-double-couple earthquakes in 2017 swarm in Reykjanes Peninsula, SW Iceland: Sensitive indicator of volcano-tectonic movements at slow-spreading rift
作者: Hrubcová P.; Doubravová J.; Vavryčuk V.
刊名: Earth and Planetary Science Letters
ISSN: 0012821X
出版年: 2021
卷: 563
语种: 英语
中文关键词: earthquake swarm ; focal mechanisms ; moment tensor ; non-double-couple components ; Reykjanes Peninsula SW Iceland ; volcano-tectonic evolution
英文关键词: Fault slips ; Hydraulic structures ; Shear flow ; Strike-slip faults ; Tensors ; Volcanoes ; Divergents ; Earthquake swarms ; Focal mechanism ; Icelands ; Moment tensors ; Non-double-couple component ; Reykjane peninsula SW iceland ; Tectonic process ; Volcano-tectonic evolution ; Volumetric components ; Earthquakes ; earthquake event ; earthquake swarm ; focal mechanism ; moment tensor ; plate boundary ; plate motion ; rifting ; seismic moment ; seismotectonics ; strike-slip fault ; tectonic evolution ; tectonic setting ; Iceland ; Reykjanes Peninsula ; Indicator indicator
英文摘要: The analysis of the 2017 earthquake swarm along the obliquely divergent Reykjanes Peninsula plate boundary revealed the most frequent focal mechanisms corresponding to main activated fault, which relates to transform faulting of the North Atlantic Rift in Iceland. Detailed double-difference locations, focal mechanisms and non-double-couple (non-DC) volumetric components of seismic moment tensors indicate an activation of three fault segments suggesting continuous interactions between tectonic and magmatic processes. They are related to inflation/deflation of a vertical magmatic dike and comprise: (1) shearing at strike-slip transform fault with left lateral motion; (2) collapses at normal faulting with negative volumetric components due to magma/fluid escape, and (3) shear-tensile opening at oblique strike-slip faulting with positive volumetric components connected to flow of trapped over-pressurized fluids. The identification of three regimes of complex volcano-tectonic evolution in divergent plate movement proves an enormous capability of the non-DC volumetric components to map tectonic processes in such settings. © 2021 The Author(s)
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/165516
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作者单位: Institute of Geophysics, Czech Academy of Sciences, Prague, Czech Republic

Recommended Citation:
Hrubcová P.,Doubravová J.,Vavryčuk V.. Non-double-couple earthquakes in 2017 swarm in Reykjanes Peninsula, SW Iceland: Sensitive indicator of volcano-tectonic movements at slow-spreading rift[J]. Earth and Planetary Science Letters,2021-01-01,563
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