دورية أكاديمية
Slip-rates of blind thrusts in slow deforming areas: examples from the Po Plain (Italy)
| العنوان: | Slip-rates of blind thrusts in slow deforming areas: examples from the Po Plain (Italy) |
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| المؤلفون: | Maesano, F. A., D'Ambrogi, C., Burrato, P., Toscani, G. |
| المساهمون: | Maesano, F. A., ISPRA Servizio Geologico d’Italia, Via Vitaliano Brancati, 48, 00144 Roma, Italy, D'Ambrogi, C., Burrato, P., Istituto Nazionale di Geofisica e Vulcanologia, Sezione Roma1, Roma, Italia, Toscani, G., Dipartimento di Scienze della Terra e dell’Ambiente, Università di Pavia, Via Ferrata, 1 - 27100 |
| بيانات النشر: | Elsevier Science Limited |
| سنة النشر: | 2015 |
| المجموعة: | Earth-Prints (Istituto Nazionale di Geofisica e Vulcanologia) |
| مصطلحات موضوعية: | Blind thrusts, Slip rates, 3D geological modeling, Sediment decompaction, Po Plain, Northern Apennines, 04. Solid Earth::04.04. Geology::04.04.01. Earthquake geology and paleoseismology, 04. Solid Earth::04.04. Geology::04.04.09. Structural geology |
| الوصف: | We calculate Plio-Pleistocene slip rates on the blind thrusts of the outer Northern Apennines fronts, that are the potential sources of highly damaging earthquakes, as shown by the MW 6.1-6.0, 2012 Emilia-Romagna seismic sequence. Slip rates are a key parameter for understanding the seismogenic potential of active fault systems and assessing the seismic hazard they pose, however, they are difficult to calculate in slow deforming areas like the Po Plain where faulting and folding is mostly blind. To overcome this, we developed a workflow which included the preparation of a homogeneous regional dataset of geological and geophysical subsurface information, rich in Plio- Pleistocene data. We then constructed 3D geological models around selected individual structures to decompact the clastic units and restore the slip on the fault planes. The back-stripping of the differential compaction eliminates unwanted overestimation of the slip rates due to compactioninduced differential subsidence. Finally, to restore the displacement we used different methods according to the deformation style, i.e. Fault Parallel Flow for faulted horizons, trishear and elastic dislocation modeling for fault-propagation folds. The result of our study is the compilation of a slip rate database integrating former published values with 28 new values covering a time interval from the Pliocene to the present. It contains data on 14 individual blind thrusts including the Mirandola thrust, seismogenic source of the 29 May 2012, MW 6.0 earthquake. Our study highlights that the investigated thrusts were active with rates ranging between 0.1-1.0 mm/yr during the last 1.81 Myr. The Mirandola thrust slipped at 0.86±0.38 mm/yr during the last 0.4 Myr. These rates calculated with an homogeneous methodology through the entire Po Plain can be charged entirely to the thrust activity and not to secondary effects like the differential compaction of sediments across the structures. ; Published ; 8–25 ; 2T. Tettonica attiva ; JCR Journal ; open |
| نوع الوثيقة: | article in journal/newspaper |
| اللغة: | English |
| تدمد: | 0040-1951 1879-3266 |
| العلاقة: | Tectonophysics; /643 (2015); http://hdl.handle.net/2122/9209Test |
| DOI: | 10.1016/j.tecto.2014.12.007 |
| الإتاحة: | https://doi.org/10.1016/j.tecto.2014.12.007Test http://hdl.handle.net/2122/9209Test |
| حقوق: | open |
| رقم الانضمام: | edsbas.101037CE |
| قاعدة البيانات: | BASE |
| تدمد: | 00401951 18793266 |
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| DOI: | 10.1016/j.tecto.2014.12.007 |