Surface Deformation Analysis of the Wider Zagreb Area (Croatia) with Focus on the Kašina Fault, Investigated with Small Baseline InSAR Observations
The wider Zagreb area is considered one of the few seismically active areas in the Republic of Croatia. During the period 1880−1906, moderate to strong seismic activity with three earthquakes magnitude M<inline-formula> <math display="inline"> <semantics> <ms...
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MDPI AG
2019-11-01
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| Series: | Sensors |
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| Online Access: | https://www.mdpi.com/1424-8220/19/22/4857 |
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| author | Marin Govorčin Boško Pribičević Shimon Wdowinski |
| author_facet | Marin Govorčin Boško Pribičević Shimon Wdowinski |
| author_sort | Marin Govorčin |
| collection | DOAJ |
| description | The wider Zagreb area is considered one of the few seismically active areas in the Republic of Croatia. During the period 1880−1906, moderate to strong seismic activity with three earthquakes magnitude M<inline-formula> <math display="inline"> <semantics> <msub> <mrow></mrow> <mi>L</mi> </msub> </semantics> </math> </inline-formula>≥ 6 occurred on the NW-SE striking Kašina Fault and since then, the area has not experienced earthquakes exceeding magnitude M<inline-formula> <math display="inline"> <semantics> <mrow> <msub> <mrow></mrow> <mi>L</mi> </msub> <mo>=</mo> <mn>5</mn> </mrow> </semantics> </math> </inline-formula>. In order to estimate the ongoing interseismic strain accumulation along the fault, we analyze Advanced Land Observing Satellite (ALOS) Phased Array L-band SAR (PALSAR) and Environmental Satellite (Envisat)-Advanced Synthetic Aperture Radar (ASAR) datasets acquired over the period 2007−2010 and 2002−2010, respectively. The data were analyzed using small baseline interferometry (SBI) technique and indicate very slow surface deformations in the area, within ±3.5 mm/year, which are in a good agreement with previous geodetic studies. Interseismic strain accumulation analysis was conducted on two 14 km long segments of the Kašina Fault, seismically active in the South and stable in the North. The analysis indicates an ongoing interseismic strain accumulation of 2.3 mm/year on the Southern segment and no detectable strain accumulation on the Northern segment. Taking into consideration the lack of moderate to strong seismic activity in the past 113 years combined with the preliminary geodetic analysis from this study, we can conclude that the Southern segment of the Kašina Fault has the potential to generate earthquake magnitude M<inline-formula> <math display="inline"> <semantics> <msub> <mrow></mrow> <mi>w</mi> </msub> </semantics> </math> </inline-formula>< 6. |
| first_indexed | 2024-04-14T01:02:40Z |
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| institution | Directory Open Access Journal |
| issn | 1424-8220 |
| language | English |
| last_indexed | 2024-04-14T01:02:40Z |
| publishDate | 2019-11-01 |
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| spelling | doaj.art-b81e3952cd4a49b9855ff5ee74fb7a6a2022-12-22T02:21:21ZengMDPI AGSensors1424-82202019-11-011922485710.3390/s19224857s19224857Surface Deformation Analysis of the Wider Zagreb Area (Croatia) with Focus on the Kašina Fault, Investigated with Small Baseline InSAR ObservationsMarin Govorčin0Boško Pribičević1Shimon Wdowinski2Faculty of Geodesy, University of Zagreb, Kačićeva 26, HR-10000 Zagreb, CroatiaFaculty of Geodesy, University of Zagreb, Kačićeva 26, HR-10000 Zagreb, CroatiaDepartment of Earth and Environment, Florida International University, 11200 SW 8th Street, Miami, FL 33199, USAThe wider Zagreb area is considered one of the few seismically active areas in the Republic of Croatia. During the period 1880−1906, moderate to strong seismic activity with three earthquakes magnitude M<inline-formula> <math display="inline"> <semantics> <msub> <mrow></mrow> <mi>L</mi> </msub> </semantics> </math> </inline-formula>≥ 6 occurred on the NW-SE striking Kašina Fault and since then, the area has not experienced earthquakes exceeding magnitude M<inline-formula> <math display="inline"> <semantics> <mrow> <msub> <mrow></mrow> <mi>L</mi> </msub> <mo>=</mo> <mn>5</mn> </mrow> </semantics> </math> </inline-formula>. In order to estimate the ongoing interseismic strain accumulation along the fault, we analyze Advanced Land Observing Satellite (ALOS) Phased Array L-band SAR (PALSAR) and Environmental Satellite (Envisat)-Advanced Synthetic Aperture Radar (ASAR) datasets acquired over the period 2007−2010 and 2002−2010, respectively. The data were analyzed using small baseline interferometry (SBI) technique and indicate very slow surface deformations in the area, within ±3.5 mm/year, which are in a good agreement with previous geodetic studies. Interseismic strain accumulation analysis was conducted on two 14 km long segments of the Kašina Fault, seismically active in the South and stable in the North. The analysis indicates an ongoing interseismic strain accumulation of 2.3 mm/year on the Southern segment and no detectable strain accumulation on the Northern segment. Taking into consideration the lack of moderate to strong seismic activity in the past 113 years combined with the preliminary geodetic analysis from this study, we can conclude that the Southern segment of the Kašina Fault has the potential to generate earthquake magnitude M<inline-formula> <math display="inline"> <semantics> <msub> <mrow></mrow> <mi>w</mi> </msub> </semantics> </math> </inline-formula>< 6.https://www.mdpi.com/1424-8220/19/22/4857insarsbasstampsinterseismic strain accumulationsurface deformation analysis |
| spellingShingle | Marin Govorčin Boško Pribičević Shimon Wdowinski Surface Deformation Analysis of the Wider Zagreb Area (Croatia) with Focus on the Kašina Fault, Investigated with Small Baseline InSAR Observations Sensors insar sbas stamps interseismic strain accumulation surface deformation analysis |
| title | Surface Deformation Analysis of the Wider Zagreb Area (Croatia) with Focus on the Kašina Fault, Investigated with Small Baseline InSAR Observations |
| title_full | Surface Deformation Analysis of the Wider Zagreb Area (Croatia) with Focus on the Kašina Fault, Investigated with Small Baseline InSAR Observations |
| title_fullStr | Surface Deformation Analysis of the Wider Zagreb Area (Croatia) with Focus on the Kašina Fault, Investigated with Small Baseline InSAR Observations |
| title_full_unstemmed | Surface Deformation Analysis of the Wider Zagreb Area (Croatia) with Focus on the Kašina Fault, Investigated with Small Baseline InSAR Observations |
| title_short | Surface Deformation Analysis of the Wider Zagreb Area (Croatia) with Focus on the Kašina Fault, Investigated with Small Baseline InSAR Observations |
| title_sort | surface deformation analysis of the wider zagreb area croatia with focus on the kasina fault investigated with small baseline insar observations |
| topic | insar sbas stamps interseismic strain accumulation surface deformation analysis |
| url | https://www.mdpi.com/1424-8220/19/22/4857 |
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