Two phases of aseismic afterslip following the March 2021 Damasi, Greece, normal faulting earthquakes retrieved from InSAR measurements
Abstract We investigated the post-seismic period of the March 2021 Damasi-Tyrnavos (Thessaly, Greece) normal fault earthquakes by applying the multi-temporal interferometric Small Baseline Subset method. We processed 68 ascending Sentinel-1 acquisitions between 2020/03/15 and 2022/09/12. Our results...
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2025-04-01
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| author | Cristiano Tolomei Athanassios Ganas Christian Bignami Simone Atzori Michael Foumelis Emmanouela Konstantakopoulou |
| author_facet | Cristiano Tolomei Athanassios Ganas Christian Bignami Simone Atzori Michael Foumelis Emmanouela Konstantakopoulou |
| author_sort | Cristiano Tolomei |
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| description | Abstract We investigated the post-seismic period of the March 2021 Damasi-Tyrnavos (Thessaly, Greece) normal fault earthquakes by applying the multi-temporal interferometric Small Baseline Subset method. We processed 68 ascending Sentinel-1 acquisitions between 2020/03/15 and 2022/09/12. Our results identified three areas on the hanging wall of the ruptured faults showing non-linear deformation trends (systematic motion away from the satellite), and another area, on the footwall (systematic motion towards the satellite), interpreted as due to a post-seismic effect. Inversion of the InSAR data indicated the occurrence of afterslip co-planar to the sequence’s two largest fault planes (M 6.3 and M 6.0, respectively). Most of the afterslip, with a peak of about 0.2 m, occurred on the fault corresponding to the 4 March 2021 event, at a depth of 7.5 km, while the fault corresponding to the M 6.3 event only showed very shallow adjustments and minor features at the border of the coseismic pattern. The transient uplift affected the footwall of the 3 March 2021 event and may indicate that the rupture nearly reached the surface towards the SW of the epicenter. The afterslip showed a fast phase lasting between March and August 2021 (5 months) and a second phase from March 2022 up to September 2022. A correlation between afterslip and relocated hypocenters indicates that most of the afterslip was aseismic. The moment release of the afterslip (fast phase) is about 7% that of the mainshocks. |
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| spelling | doaj-art-28bbae9ee23a445d942469ec25276c2d2025-08-20T02:17:54ZengNature PortfolioScientific Reports2045-23222025-04-0115111310.1038/s41598-025-96503-8Two phases of aseismic afterslip following the March 2021 Damasi, Greece, normal faulting earthquakes retrieved from InSAR measurementsCristiano Tolomei0Athanassios Ganas1Christian Bignami2Simone Atzori3Michael Foumelis4Emmanouela Konstantakopoulou5Istituto Nazionale di Geofisica e VulcanologiaNational Observatory of Athens, Institute of GeodynamicsIstituto Nazionale di Geofisica e VulcanologiaIstituto Nazionale di Geofisica e VulcanologiaAristotle University of ThessalonikiNational Observatory of Athens, Institute of GeodynamicsAbstract We investigated the post-seismic period of the March 2021 Damasi-Tyrnavos (Thessaly, Greece) normal fault earthquakes by applying the multi-temporal interferometric Small Baseline Subset method. We processed 68 ascending Sentinel-1 acquisitions between 2020/03/15 and 2022/09/12. Our results identified three areas on the hanging wall of the ruptured faults showing non-linear deformation trends (systematic motion away from the satellite), and another area, on the footwall (systematic motion towards the satellite), interpreted as due to a post-seismic effect. Inversion of the InSAR data indicated the occurrence of afterslip co-planar to the sequence’s two largest fault planes (M 6.3 and M 6.0, respectively). Most of the afterslip, with a peak of about 0.2 m, occurred on the fault corresponding to the 4 March 2021 event, at a depth of 7.5 km, while the fault corresponding to the M 6.3 event only showed very shallow adjustments and minor features at the border of the coseismic pattern. The transient uplift affected the footwall of the 3 March 2021 event and may indicate that the rupture nearly reached the surface towards the SW of the epicenter. The afterslip showed a fast phase lasting between March and August 2021 (5 months) and a second phase from March 2022 up to September 2022. A correlation between afterslip and relocated hypocenters indicates that most of the afterslip was aseismic. The moment release of the afterslip (fast phase) is about 7% that of the mainshocks.https://doi.org/10.1038/s41598-025-96503-8InSARGround deformationPost-seismicThessalyEarthquakes |
| spellingShingle | Cristiano Tolomei Athanassios Ganas Christian Bignami Simone Atzori Michael Foumelis Emmanouela Konstantakopoulou Two phases of aseismic afterslip following the March 2021 Damasi, Greece, normal faulting earthquakes retrieved from InSAR measurements Scientific Reports InSAR Ground deformation Post-seismic Thessaly Earthquakes |
| title | Two phases of aseismic afterslip following the March 2021 Damasi, Greece, normal faulting earthquakes retrieved from InSAR measurements |
| title_full | Two phases of aseismic afterslip following the March 2021 Damasi, Greece, normal faulting earthquakes retrieved from InSAR measurements |
| title_fullStr | Two phases of aseismic afterslip following the March 2021 Damasi, Greece, normal faulting earthquakes retrieved from InSAR measurements |
| title_full_unstemmed | Two phases of aseismic afterslip following the March 2021 Damasi, Greece, normal faulting earthquakes retrieved from InSAR measurements |
| title_short | Two phases of aseismic afterslip following the March 2021 Damasi, Greece, normal faulting earthquakes retrieved from InSAR measurements |
| title_sort | two phases of aseismic afterslip following the march 2021 damasi greece normal faulting earthquakes retrieved from insar measurements |
| topic | InSAR Ground deformation Post-seismic Thessaly Earthquakes |
| url | https://doi.org/10.1038/s41598-025-96503-8 |
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