Seismic and field traces of the Kroměříž fault
| Authors | |
|---|---|
| Year of publication | 2024 |
| Type | Article in Proceedings |
| Conference | Studentská geologická konference 2024 |
| MU Faculty or unit | |
| Citation | |
| web | https://munispace.muni.cz/library/catalog/book/2366 |
| Keywords | Outer Western Carpathians, accretion wedge, Upper Morava Basin, fault, 2D seismic interpretation, boreholes, Petrel, Kroměříž fault |
| Description | Western Carpathian flysch zone is in the central Moravia covered by the Pliocene graben of SE-NW direction. The southern fault of the graben is named the Kroměříž fault.We used 33seismic profiles, and 6 boreholes were utilized. Specifically, these include 2Dreflection seismic profiles and seismically surveyed boreholes with a depth of at least 1 km forthestudy of the Kroměříž Fault. This data was processed using Petrel software, which allows for interpretation in 3D. Through this method, three stratigraphic boundaries were identified: the Brunovistulian, Miocene, and accretionary wedge. By identifying these boundaries, it was possible to place the interpreted faults within a temporal framework. Based on this data, it was found that the Kroměříž Fault is a structure withanortheast-southwest orientation. This fault dips towards the east to northeast and affects both Brunovistulian and Miocene layers, as well as the accretionary wedge. Specifically, these layers are downthrown along the Kroměříž Fault, creating a graben structure. The degree of subsidence varies among different layers, with the greatest offset observed in the base of the Brunovistulian, averaging asubsidence of 400 m with a maximum value of up to 990 m. The smallest offset occurs in thesediments oftheaccretionary wedge. The heterogeneous subsidence along the Kroměříž Fault indicates that it is a syn-sedimentary fault, rather than one that occurred after the sedimentation of all layers. The onset of subsidence can be attributed to theMiocene, while the final phase of the Kroměříž Fault can be traced to the Pliocene based on borehole data. Based on 3D modellingof the Brunovistulian, it was found that the Kroměříž Fault ispart of a larger system of subsidence faults and cannot be unequivocally delineated in the model. |
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