Multiple ruptures on the North-Sofia fault at Gorni Bogrov from scarp profile and shallow geophysics
نویسندگان
چکیده
The seismic hazard assessment across the densely urbanized region in Sofia Basin Bulgaria can be improved through using fault data, search of which we first aim to attain a better knowledge on past earthquake ground ruptures. Currently focused North-Sofia fault, investigated whether, and how, fluvial system responded displacements at site located near village Gorni Bogrov. At studied site, scarp delimits distal alluvial fan upper surface from an plain lower surface. Although forms complex structure that resembles breached relay ramp, its origin is questionable, because basin axial stream could have caused lateral erosion approaching toe fan. electrical resistivity profiles measured imply recent deposits are associated with displacement. A beneath middle slope juxtaposes Neogene sand layers, covered by footwall, colluvial laterally merged hangingwall. also contains non-tectonic component related affecting mainly slope. Breaks profile interpreted originated repeatedly renewed due multiple times. interseismic intervals inferred order thousands years but not longer. correspond approximately those adjacent South-Ihtiman distant Chirpan faults; however, they noticeably shorter compared Zlatitsa Krupnik faults. It seems likely faults broad Balkans release strain remarkably different rates, independently their proximity.
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ژورنال
عنوان ژورنال: Geologica Balcanica
سال: 2023
ISSN: ['0324-0894', '2535-1060']
DOI: https://doi.org/10.52321/geolbalc.52.2.65