Seismicity around the Hekla and Torfajokull volcanoes, Iceland, during a volcanically quiet period, 1991-1995

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doi: 10.1007/s004450050173
Authors:Soosalu, H.; Einarsson, P.
Author Affiliations:Primary:
Univ. Iceland, Sci. Inst., Reykjavik, Iceland
Volume Title:Bulletin of Volcanology
Source:for the [Bulletin of Volcanology, 59(1), p.36-48. Publisher: Springer International] International Association of Volcanology and Chemistry of the Earth's Interior (IAVCEI), Heidelberg, International. ISSN: 0258-8900
Publication Date:1997
Note:In English. 36 refs.; illus., incl. 3 tables, geol. sketch maps
Summary:Hekla became aseismic after the high seismic activity of the last eruption in 1991, but a prominent earthquake cluster in the neighbouring Torfajökull had epicentres in and to the west of the western part of the Caldera, with hypocentres down to 14 km and with highest activity at 5-12 km. Inside the cluster a spherical volume void of earthquakes, ∼ 4 km in diameter and 8 km deep is interpreted as a cooling magma body. Small, low-frequency events at Torfajökull during the first year of the study may be connected to the 1991 Hekla eruption. The seismicity in the two volcanic systems shows some of the characteristics, and may be a continuation of the depth trend of the South Iceland seismic zone where epicentres are concentrated into two N-S lineaments. The events located at and to the north of Hekla are of low-frequency indicative of a volcanic origin, but show clear S arrivals at observing stations like normal high-frequency tectonic earthquakes. [E.H.F.]
Subjects:Arrays; Earthquakes; Eruptions; Faults; Focal mechanism; Focus; Seismicity; Spatial distribution; Europe; Hekla; Iceland; Western Europe; Torfajokull
Abstract Numbers:98M/887
Record ID:1999009760
Copyright Information:GeoRef, Copyright 2019 American Geosciences Institute. Reference includes data from Mineralogical Abstracts, United Kingdom, Twickenham, United Kingdom, Reference includes data from Geoline, Bundesanstalt fur Geowissenschaften und Rohstoffe
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