Seismicity and Neotectonics of the East Alpine-Carpathian and Pannonian Area
Published:January 01, 1988
R. Gutdeutsch, K. Aric, 1988. "Seismicity and Neotectonics of the East Alpine-Carpathian and Pannonian Area", The Pannonian Basin: A Study in Basin Evolution, Leigh H. Royden, Ferenc Horváth
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A map of epicenter locations of the Eastern European Alpine system was compiled and, together with focal solutions and geologic data for recent deformation, was used to relate recent seismicity to a regional tectonic system. The seismicity data show a scattered distribution for most of the Carpathian-Pannonian region but, along the western edge of the Pannonian basin and in the Eastern Alps and Dinarides, several distinct seismic zones can be recognized. A linear zone of seismic activity in the Eastern Alps (Mur-Murz-line) strikes northeast into the southern Vienna basin. Focal mechanisms indicate left-slip along this zone, and the southern Vienna basin may be extending east-west as a pull-apart basin. To the southwest, this transform-like fault zone and its associated seismicity end abruptly in two north-south trending grabens that exhibit east-west extension (Lavant and Metnitz Valleys), lb the south, these grabens end in Yugoslavia in a dextral strike-slip fault system that trends southeast along the strike of the Dinaric Alps. A left-stepping offset between two dextral fault segments in this system results in roughly north-south crustal shortening and uplift near the ends of the two fault segments (Medvednica zone).
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The Pannonian Basin: A Study in Basin Evolution
The Pannonian basin system is an integrap part of the Alpine mountain belts of east-central Europe. It is completely encircled by the Carpathian Mountains to the north and east, the Dinaric Alps to the south, and the Southern and Eastern Alps to the west. In 1912, Kober defined the Pannonian basin as one of the type “Zwischengebirge,” a relatively un-deformed region characterized by block faulting and situated between externally vergent thrust belts. More recent studies using subsurface data have shown that the Pannonian area was extensively deformed by Mesozoic thrusting and subsequently disrupted by a complex system of Cenozoic normal and wrench faults. Thus, the Pannonian “massif” has undergone several types of deformation, which are partly hidden by a thick sequence of sedimentary rocks of Neogene-Quaternary age. The Pannonian basin is actually a system of small, deep basins separated by relatively shallow basement blocks. The Neogene-Quaternary sedimentary rocks exceed 7 km in thickness in some areas, and the basin system (including the Transylvanian basin) is about 400 km from north to south and 800 km from east to west. It is currently interpreted by most workers as a Mediterranean back arc extensional basin of the middle Miocene age. The Carpathians, Eastern Alps, and Dinarides, which surround the Pannonian basin, are the result of Mesozoic and Cenozoic continental collision between Europe and several continental fragments to the south, including Africa. Thrusting was direted outward from the present Pannonian basin toward the European platform and the Adriatic region. In all the orogenic belts, the interior parts of the thrust belts were deformed in Mesozoic time, while the outer parts were deformed in Tertiary time. The volume presents 26 papers and eight regional maps resulting from a joint five-day symposium held in Veszprem, Hungary, in 1982 entitled “Evolution of Extensional Basins within Regions of Compression with Emphasis on the Intra-Carpathian Region.” The symposium was sponsored jointly by the Hungarian Oil and Gas Trust, the Hungarian Geological Survey, and the U.S. National Science Foundation.