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Non-double-couple earthquakes in 2017 swarm in Reykjanes Peninsula, SW Iceland: Sensitive indicator of volcano-tectonic movements at slow-spreading rift
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SYSNO ASEP 0541510 Document Type J - Journal Article R&D Document Type Journal Article Subsidiary J Článek ve WOS Title Non-double-couple earthquakes in 2017 swarm in Reykjanes Peninsula, SW Iceland: Sensitive indicator of volcano-tectonic movements at slow-spreading rift Author(s) Hrubcová, Pavla (GFU-E) ORCID, RID
Doubravová, Jana (GFU-E) ORCID, RID
Vavryčuk, Václav (GFU-E) ORCID, RIDArticle number 116875 Source Title Earth and Planetary Science Letters. - : Elsevier - ISSN 0012-821X
Roč. 563, June (2021)Number of pages 11 s. Publication form Print - P Language eng - English Country NL - Netherlands Keywords earthquake swarm ; moment tensor ; non-double-couple components ; Reykjanes Peninsula SW Iceland ; focal mechanisms ; volcano-tectonic evolution Subject RIV DC - Siesmology, Volcanology, Earth Structure OECD category Volcanology R&D Projects GA18-05053S GA ČR - Czech Science Foundation (CSF) GA19-06422S GA ČR - Czech Science Foundation (CSF) LM2010008 GA MŠMT - Ministry of Education, Youth and Sports (MEYS) Method of publishing Open access Institutional support GFU-E - RVO:67985530 UT WOS 000638044500006 EID SCOPUS 85103551015 DOI 10.1016/j.epsl.2021.116875 Annotation 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. Workplace Geophysical Institute Contact Hana Krejzlíková, kniha@ig.cas.cz, Tel.: 267 103 028 Year of Publishing 2022 Electronic address https://www.sciencedirect.com/science/article/pii/S0012821X21001345
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