Strong ground motion in the epicentral area of the 2020-2021 earthquake swarm in the Reykjanes Peninsula, Iceland
The Geldingadalur eruption in the Reykjanes Peninsula on 19 March 2021 was preceded by several earthquakes of volcano-tectonic origin throughout 2020 and 2021. Seven earthquakes with magnitude M≥5 took place during the swarm, all of them recorded by the Icelandic Strong Motion Network operated by th...
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ftopinvisindi:oai:opinvisindi.is:20.500.11815/3838 2023-05-15T16:46:34+02:00 Strong ground motion in the epicentral area of the 2020-2021 earthquake swarm in the Reykjanes Peninsula, Iceland Hernandez, Victor Rupakhety, Rajesh Ólafsson, Símon Bessason, Bjarni Erlingsson, Sigurdur Umhverfis- og byggingarverkfræðideild (HÍ) Faculty of Civil and Environmental Engineering (UI) Verkfræði- og náttúruvísindasvið (HÍ) School of Engineering and Natural Sciences (UI) Háskóli Íslands University of Iceland 2022-09-04 222-229 https://hdl.handle.net/20.500.11815/3838 en eng Conspress European Conference on Earthquake Engineering & Seismology;2022(3) https://hdl.handle.net/20.500.11815/3838 European Conference on Earthquake Engineering & Seismology info:eu-repo/semantics/openAccess Jarðskjálftaverkfræði Volcano-tectonic earthquake Peak ground acceleration info:eu-repo/semantics/conferenceObject 2022 ftopinvisindi https://doi.org/20.500.11815/3838 2023-01-11T23:50:54Z The Geldingadalur eruption in the Reykjanes Peninsula on 19 March 2021 was preceded by several earthquakes of volcano-tectonic origin throughout 2020 and 2021. Seven earthquakes with magnitude M≥5 took place during the swarm, all of them recorded by the Icelandic Strong Motion Network operated by the Earthquake Engineering Research Centre of the University of Iceland. In this paper we present salient features of strong ground motion in the epicentral area caused by the swarm. Interestingly, earthquakes as small as M5.0 caused peak ground acceleration (PGA) larger than the 475-year return period PGA at a town near the epicentral area. At two recording stations, unusually high energy content at vibration periods <0.3s was detected, with spectral accelerations exceeding the design values. The largest recorded horizontal PGA was ~0.4g at Krýsuvík, station, which is the strongest PGA recorded in Iceland since the MW6.3 2008 Ölfus Earthquake. For this station we present horizontal-to-vertical spectral ratios indicating likely site-effects. We also compare the attenuation of PGA of the largest event of the sequence with two groundmotion prediction equations (GMPEs). The recorded PGA attenuation is well captured by a local GMPE. This work was partly financed by the SERICE project funded by a Grant of Excellence from the Icelandic Centre for Research (RANNIS), Grant number: 218149-051. The authors also acknowledge support from the University of Iceland Research Fund. The authors wish to thank the Icelandic Meteorological Office for access to the earthquake catalogue. Peer Reviewed Conference Object Iceland Opin vísindi (Iceland) Krýsuvík ENVELOPE(-22.052,-22.052,63.897,63.897) Reykjanes ENVELOPE(-22.250,-22.250,65.467,65.467) |
institution |
Open Polar |
collection |
Opin vísindi (Iceland) |
op_collection_id |
ftopinvisindi |
language |
English |
topic |
Jarðskjálftaverkfræði Volcano-tectonic earthquake Peak ground acceleration |
spellingShingle |
Jarðskjálftaverkfræði Volcano-tectonic earthquake Peak ground acceleration Hernandez, Victor Rupakhety, Rajesh Ólafsson, Símon Bessason, Bjarni Erlingsson, Sigurdur Strong ground motion in the epicentral area of the 2020-2021 earthquake swarm in the Reykjanes Peninsula, Iceland |
topic_facet |
Jarðskjálftaverkfræði Volcano-tectonic earthquake Peak ground acceleration |
description |
The Geldingadalur eruption in the Reykjanes Peninsula on 19 March 2021 was preceded by several earthquakes of volcano-tectonic origin throughout 2020 and 2021. Seven earthquakes with magnitude M≥5 took place during the swarm, all of them recorded by the Icelandic Strong Motion Network operated by the Earthquake Engineering Research Centre of the University of Iceland. In this paper we present salient features of strong ground motion in the epicentral area caused by the swarm. Interestingly, earthquakes as small as M5.0 caused peak ground acceleration (PGA) larger than the 475-year return period PGA at a town near the epicentral area. At two recording stations, unusually high energy content at vibration periods <0.3s was detected, with spectral accelerations exceeding the design values. The largest recorded horizontal PGA was ~0.4g at Krýsuvík, station, which is the strongest PGA recorded in Iceland since the MW6.3 2008 Ölfus Earthquake. For this station we present horizontal-to-vertical spectral ratios indicating likely site-effects. We also compare the attenuation of PGA of the largest event of the sequence with two groundmotion prediction equations (GMPEs). The recorded PGA attenuation is well captured by a local GMPE. This work was partly financed by the SERICE project funded by a Grant of Excellence from the Icelandic Centre for Research (RANNIS), Grant number: 218149-051. The authors also acknowledge support from the University of Iceland Research Fund. The authors wish to thank the Icelandic Meteorological Office for access to the earthquake catalogue. Peer Reviewed |
author2 |
Umhverfis- og byggingarverkfræðideild (HÍ) Faculty of Civil and Environmental Engineering (UI) Verkfræði- og náttúruvísindasvið (HÍ) School of Engineering and Natural Sciences (UI) Háskóli Íslands University of Iceland |
format |
Conference Object |
author |
Hernandez, Victor Rupakhety, Rajesh Ólafsson, Símon Bessason, Bjarni Erlingsson, Sigurdur |
author_facet |
Hernandez, Victor Rupakhety, Rajesh Ólafsson, Símon Bessason, Bjarni Erlingsson, Sigurdur |
author_sort |
Hernandez, Victor |
title |
Strong ground motion in the epicentral area of the 2020-2021 earthquake swarm in the Reykjanes Peninsula, Iceland |
title_short |
Strong ground motion in the epicentral area of the 2020-2021 earthquake swarm in the Reykjanes Peninsula, Iceland |
title_full |
Strong ground motion in the epicentral area of the 2020-2021 earthquake swarm in the Reykjanes Peninsula, Iceland |
title_fullStr |
Strong ground motion in the epicentral area of the 2020-2021 earthquake swarm in the Reykjanes Peninsula, Iceland |
title_full_unstemmed |
Strong ground motion in the epicentral area of the 2020-2021 earthquake swarm in the Reykjanes Peninsula, Iceland |
title_sort |
strong ground motion in the epicentral area of the 2020-2021 earthquake swarm in the reykjanes peninsula, iceland |
publisher |
Conspress |
publishDate |
2022 |
url |
https://hdl.handle.net/20.500.11815/3838 |
long_lat |
ENVELOPE(-22.052,-22.052,63.897,63.897) ENVELOPE(-22.250,-22.250,65.467,65.467) |
geographic |
Krýsuvík Reykjanes |
geographic_facet |
Krýsuvík Reykjanes |
genre |
Iceland |
genre_facet |
Iceland |
op_relation |
European Conference on Earthquake Engineering & Seismology;2022(3) https://hdl.handle.net/20.500.11815/3838 European Conference on Earthquake Engineering & Seismology |
op_rights |
info:eu-repo/semantics/openAccess |
op_doi |
https://doi.org/20.500.11815/3838 |
_version_ |
1766036675404759040 |