EGU22-9802
https://doi.org/10.5194/egusphere-egu22-9802
EGU General Assembly 2022
© Author(s) 2022. This work is distributed under
the Creative Commons Attribution 4.0 License.

The REYKJANET local seismic network ideally placed for capturing the 2021 Fagradalsfjall pre-eruptive seismicity: in operation since 2013

Thorbjörg Ágústsdóttir1, Josef Horálek2, Egill Árni Gudnason1, Jana Doubravová2, Gylfi Páll Hersir1, Jakub Klicpera2, Fridgeir Pétursson1, Rögnvaldur Líndal Magnússon1, Jiri Málek3, Lucia Fojtíková3, Tomáš Fischer4, Josef Vlček4, and Ali Salama4
Thorbjörg Ágústsdóttir et al.
  • 1Iceland GeoSurvey, Reykjavik, Iceland (tha@isor.is)
  • 2Institute of Geophysics, Prague
  • 3Institute of Rock Structure and Mechanics, Prague
  • 4Charles University, Faculty of Science, Prague

The REYKJANET local seismic network was deployed on the Reykjanes Peninsula, SW Iceland, in 2013; funded by the Czech Academy of Science and supported by Iceland GeoSurvey. The network consists of 15 seismic stations, using Nanometrics Centaur digitizers sampling at a rate of 250 sps with a GPS timestamp. Additionally, 7 stations are equipped with microbarographs. In 2016, REYKJANET was substantially upgraded when short-period seismometers were replaced by Güralp CMG-3ESPC broadband seismometers (eigenperiod T0=30s). The instruments are buried in vaults on concrete pillars and are therefore well coupled with the bedrock. They are powered by batteries recharged by solar and wind power all year round, surviving harsh winter condition and corrosion from geothermal gases. These stations are deployed along the Reykjanes Peninsula, between the Svartsengi and Hengill high temperature geothermal fields, covering an area of about 60x20 km. In the summer of 2021 two new stations were deployed on the eastern part of the Peninsula, each consisting of a Güralp CMG-40T broadband seismometers and a Kinemetrics FBA ES-T EpiSensor also sampling at 250 sps with a GPS timestamp. Since early 2021, data from all REYKJANET stations are streamed in real-time to Iceland GeoSurvey and currently 8 of them are also streamed to the Icelandic Meteorological Office for improved earthquake locations for natural hazard monitoring purposes. Since the deployment of the network in 2013, it has been operated continuously and captured the largest seismic swarms on the Reykjanes Peninsula in 2017, 2019, 2020 and 2021.The REYKJANET network was ideally placed, as the 2021 Fagradalsfjall eruption occurred right in the central part of the network. Here we present the pre-eruptive seismicity of the 2021 Fagradalsfjall eruption in comparison to previous seismic swarms.

The maintenance of REYKJANET, data analysis and interpretation are currently done within the NASPMON project (NAtural Seismicity as a Prospecting and MONitoring tool for geothermal energy extraction), funded through EEA Grants and the Technology Agency of the Czech Republic within the KAPPA Programme.

How to cite: Ágústsdóttir, T., Horálek, J., Gudnason, E. Á., Doubravová, J., Hersir, G. P., Klicpera, J., Pétursson, F., Líndal Magnússon, R., Málek, J., Fojtíková, L., Fischer, T., Vlček, J., and Salama, A.: The REYKJANET local seismic network ideally placed for capturing the 2021 Fagradalsfjall pre-eruptive seismicity: in operation since 2013, EGU General Assembly 2022, Vienna, Austria, 23–27 May 2022, EGU22-9802, https://doi.org/10.5194/egusphere-egu22-9802, 2022.