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  5. Persistent Shallow Background Microseismicity on Hekla Volcano, Iceland: A Potential Monitoring Tool
 
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Persistent Shallow Background Microseismicity on Hekla Volcano, Iceland: A Potential Monitoring Tool

Author(s)
Eibl, Eva P. S.  
Bean, Christopher J.  
Vogfjörð, Kristín  
Braiden, Aoife  
Uri
http://hdl.handle.net/10197/6281
Date Issued
2014-12-01
Date Available
2015-01-12T13:26:20Z
Abstract
Hekla is one of Iceland's most active volcanoes. Since 1970 it has erupted four times with a period of quiescence of 14 years since the last eruption. We detected persistent levels of background microseismicity with a temporary seismic network in autumn 2012. An amplitude based as well as an arrival-time based location method was applied to two populations of events and located them at shallow depths on the northern flank, close to the summit. This seismicity has not been identified previously by the permanent seismic network in Iceland as it is below its detection threshold. The detected events were either short, higher frequency events with distinct arrivals located beneath the summit on the northern flank of Hekla or longer, emergent, lower frequency events about 4 km northeast of the summit at 200¿400 m depth below the surface. Estimated moment magnitudes were MW = -1.1 to -0.1 and MW = -0.9 to -0.0 and local magnitudes ML = -0.5 to +0.3 and ML = -0.3 to +0.3, respectively. This seismicity does not show any correlation with gas output but is located at the steepest slopes of the edifice. Hence we suggest that the current shallow microseismicity at Hekla is structurally controlled. This offers a possible opportunity of using near summit microseismicity as a tool for monitoring emerging unrest at Hekla. Microseismicity rates will be very sensitive to small stress perturbations due to magma migration at depth. Currently in the absence of microseismicity monitoring, Hekla switches from apparently quiescent to fully eruptive on the order of only 1 h.
Sponsorship
European Commission - Seventh Framework Programme (FP7)
Type of Material
Journal Article
Publisher
Elsevier
Journal
Journal of Volcanology and Geothermal Research
Volume
289
Start Page
224
End Page
237
Copyright (Published Version)
2014 Elsevier
Subjects

Hekla

Iceland

Shallow seismicity

Volcano seismology

Microseismicity

Earthquake

DOI
10.1016/j.jvolgeores.2014.11.004
Language
English
Status of Item
Peer reviewed
This item is made available under a Creative Commons License
https://creativecommons.org/licenses/by-nc-nd/3.0/ie/
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Eibl_et_al_Hekla_Microseismicity_repository.pdf

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Owning collection
Earth Sciences Research Collection

Item descriptive metadata is released under a CC-0 (public domain) license: https://creativecommons.org/public-domain/cc0/.
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