Focal Mechanism of 2020–2025 Mw > 5.0 Earthquake Sequence in Bárðarbunga Volcanic Zone, Iceland, and Its Implications for Magma Inflow Activity Article Swipe
B. W. Hou
,
Xu Chang
,
Jinlai Hao
,
Qingsong Ye
·
YOU?
·
· 2025
· Open Access
·
· DOI: https://doi.org/10.3390/jmse13112172
YOU?
·
· 2025
· Open Access
·
· DOI: https://doi.org/10.3390/jmse13112172
Iceland is an emergent segment of the Mid-Atlantic Ridge, and the Bárðarbunga volcano lies in central Iceland beneath the Vatnajökull glacier, the largest glacier in Europe. Geodetic and seismic observations indicate persistent post-eruptive inflation since the 2014–2015 intense volcanic eruption at Bárðarbunga, revealing ongoing subsurface magmatic activity. To investigate details of the magma inflow process and monitor possible volcanic eruption, we studied focal mechanisms of seven earthquakes (with moment magnitude Mw > 5.0) that occurred from 2020 to 2025 in the Bárðarbunga volcanic zone, using the generalized Cut and Paste (gCAP) moment tensor inversion method. All inversions were checked and examined using the bootstrap uncertainty analysis. According to the results, all seven events exhibit significant positive non-double-couple components (35–58%), with centroid depths ranging from 3 to 9 km, within the typical brittle–ductile transition zone in Iceland. Our results correspond with the GNSS deformation data and the focal mechanism study of previous earthquakes at Bárðarbunga. We also find that focal mechanisms in the Bárðarbunga volcano region may vary with depth: shallow (≤7 km) events result from magma chamber pressurization or tensile fracturing due to magma intrusion, and deep (~9 km) activity reflects magma emplacement or overpressure accumulation.
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- article
- Language
- en
- Landing Page
- https://doi.org/10.3390/jmse13112172
- OA Status
- gold
- References
- 49
- OpenAlex ID
- https://openalex.org/W4416296124
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https://doi.org/10.3390/jmse13112172Digital Object Identifier
- Title
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Focal Mechanism of 2020–2025 Mw > 5.0 Earthquake Sequence in Bárðarbunga Volcanic Zone, Iceland, and Its Implications for Magma Inflow ActivityWork title
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articleOpenAlex work type
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enPrimary language
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2025Year of publication
- Publication date
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2025-11-17Full publication date if available
- Authors
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B. W. Hou, Xu Chang, Jinlai Hao, Qingsong YeList of authors in order
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https://doi.org/10.3390/jmse13112172Publisher landing page
- Open access
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YesWhether a free full text is available
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goldOpen access status per OpenAlex
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https://doi.org/10.3390/jmse13112172Direct OA link when available
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0Total citation count in OpenAlex
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49Number of works referenced by this work
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