Temporal Seismic Velocity Changes During the 2020 Rapid Inflation at Mt. Thorbjorn-Svartsengi, Iceland, Using Seismic Ambient Noise

Abstract

The Reykjanes peninsula (RP) in SW Iceland is an oblique spreading rift marking the plate boundary between the North American and the Eurasian plates. The complex trans-tensional regime leads to intense episodes of seismicity (Einarsson, 1991). Several volcanic systems make up the RP, that is, Reykjanes (RVS) which last erupted in 1240 CE and Krýsuvík (KVS) (Clifton & Kattenhorn, 2006; Larsen & Guðmundsson, 2016;Saemundsson et al., 2020). The fissure swarms, associated with the volcanic systems, are characterized by normal faults, eruptive fissures, crater rows, and high-temperature geothermal fields (Figure 1). Mt. Þorbjörn is situated within the fissure swarm of Svartsengi, which is a geothermal area, and a part of RVS. Recent seismic tomography of Martins et al. ( 2020) also indicated possible presence of partially molten magma beneath Svartsengi at 3-6 km depth. In January 2020, surface deformation was detected by GPS and InSAR observations with the center of uplift located ∼2 km west of Mt. Þorbjörn, indicating magmatic inflation (Geirsson et al., 2020). This is the first time such a signal has been recorded in the Reykjanes volcanic system. The inflation continued until February 6, marking the end of this first intrusive event. Two

Evolving Shallow-conduit Container Affects the Lava Fountaining during the 2021 Fagradalsfjall Eruption, Iceland

“…However, before 2021 it had not erupted in more than 6000 years (Saemunds-son and Sigurgeirsson, 2013) and hence does not follow this episodic pattern of volcanism on the Peninsula. The 2021 eruption at Fagradalsfjall may be signalling the onset of a new eruption period on the Reykjanes Peninsula (Çubuk-Sabuncu et al, 2021;Flóvenz et al, 2022;Geirsson et al, 2021).…”

Temporal Seismic Velocity Changes During the 2020 Rapid Inflation at Mt. Þorbjörn‐Svartsengi, Iceland, Using Seismic Ambient Noise

“…Seismic waveform data (Bodvarsson et al, 1996) is available at http://dx. doi.org/10.5281/zenodo.4775293 (Cubuk-Sabuncu et al, 2021) and seismic bulletins are available at http:// skjalftalisa.vedur.is/). The authors thank UI, and HS-Orka for providing GPS data (http://brunnur.vedur.…”

“…The authors acknowledge the REYKJANET network (https://www.ig.cas.cz/vyzkum-a-vyuka/observatore/lokalni-seismicka-sit-reykjanet/). Seismic waveform data (Bodvarsson et al., 1996) is available at http://dx.doi.org/10.5281/zenodo.4775293 (Cubuk‐Sabuncu et al., 2021) and seismic bulletins are available at http://skjalftalisa.vedur.is/). The authors thank UI, and HS‐Orka for providing GPS data (http://brunnur.vedur.is/gps/).…”

Ambient seismic noise monitoring and imaging at the Theistareykir geothermal field (Iceland)

“…Sánchez-Pastor et al (2019) applied CWI to a volcanic setting, reporting on short and long-term variations of the Reykjanes geothermal field (Iceland); due to injection and production activities. Cubuk-Sabuncu et al (2021) monitored the temporal velocity changes during the 2020 rapid inflation at Mt.Þ orbjörn-Svartsengi (Iceland) and correlated these changes with InSAR and GPS deformation measurements.…”