Seismic imaging of the Reykjanes Peninsula, Iceland: Crustal-scale context of geothermal areas and ongoing volcano-tectonic unrest
The result's identifiers
Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F67985530%3A_____%2F25%3A00642672" target="_blank" >RIV/67985530:_____/25:00642672 - isvavai.cz</a>
Result on the web
<a href="https://agupubs.onlinelibrary.wiley.com/doi/10.1029/2024GC011817" target="_blank" >https://agupubs.onlinelibrary.wiley.com/doi/10.1029/2024GC011817</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.1029/2024GC011817" target="_blank" >10.1029/2024GC011817</a>
Alternative languages
Result language
angličtina
Original language name
Seismic imaging of the Reykjanes Peninsula, Iceland: Crustal-scale context of geothermal areas and ongoing volcano-tectonic unrest
Original language description
Volcanic and seismic unrest on the Reykjanes Peninsula in SW Iceland that started in late 2019 after similar to 800 years of quiescence has drawn wide interest to this on-land extension of the Mid-Atlantic spreading ridge. Here, we use seismic data collected across the larger Peninsula region, covering six volcanic systems and associated high-temperature geothermal areas to produce a crustal-scale shear-wave velocity model. The model is constructed from receiver functions (RF), and pre-existing surface wave dispersion measurements from recent studies, supplemented with new inter-station paths from recent seismic deployments. We compare our velocity model to RF stacks which highlight seismic discontinuity boundaries. Results show local seismicity and geothermal systems are limited to the upper crust, which is split into an upper region of extrusive-dominated heavily fractured material <3 km and intrusive-dominated more cohesive material below. The gabbroic lower-crust is dominated by cumulates beyond 10 km depth, which are particularly high-velocity west offshore of the Peninsula. Crustal thicknesses increase from 15 to 20 km eastwards, likely reflecting increasing temperature and active-upwelling toward the center of the Iceland hotspot. Reported magma storage depths, for current and historic eruptions, generally sit within the lower-crust, but several, including for the 2021 Fagradalsfjall eruption, indicate sub-Moho storage, sourced from a seismically slow region we observe extending to 25 km, which is interpreted as representing a partially molten crust-mantle transitional region. Our seismic imaging of the Reykjanes Peninsula crust gives insight into regional crustal structure and tectonic processes, as well as providing large-scale context for the continuing volcano-tectonic unrest the region is experiencing.
Czech name
—
Czech description
—
Classification
Type
J<sub>imp</sub> - Article in a specialist periodical, which is included in the Web of Science database
CEP classification
—
OECD FORD branch
10507 - Volcanology
Result continuities
Project
<a href="/en/project/TO01000198" target="_blank" >TO01000198: NAtural Seismicity as a Prospecting and MONitoring tool for geothermal energy extraction</a><br>
Continuities
P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)
Others
Publication year
2025
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů
Data specific for result type
Name of the periodical
Geochemistry, Geophysics, Geosystems
ISSN
1525-2027
e-ISSN
1525-2027
Volume of the periodical
26
Issue of the periodical within the volume
4
Country of publishing house
US - UNITED STATES
Number of pages
19
Pages from-to
e2024GC011817
UT code for WoS article
001456099900001
EID of the result in the Scopus database
2-s2.0-105002034455