Low-frequency 3-D seismic survey of upper crustal magmatic intrusions in the northeastern Pannonian basin of Hungary |
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| Authors: | Zoltn Hajnal Endre Heged&#x;s G Randy Keller Tams Fancsik Attila Cs Kovcs Rbert Csabafi |
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| Institution: | aDepartment of Geological Sciences, University of Saskatchewan, 114 Science Place, Saskatoon, SK., S7N 5E2, Canada;bEotvos Lorand Geophysical Institute of Hungary, Kolumbusz utca 17-23, Budapest H-1145, Hungary;cDepartment of Geological Sciences, University of Texas at El Paso, El Paso TX, TX 79968, United States |
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| Abstract: | A specially designed 700-km2 grid survey, deploying 1000 regularly distributed low-frequency seismic recording systems, successfully investigated one of the most complex geologic environments of the Pannonian basin. The wide-angle signals penetrated through over 1000 m of multi-phase igneous lithology and recognized, for the first time, the underlying enigmatic Permian to Early Triassic basement rocks. Tomographic inversion of the first arrival grid data resulted in determination of an accurate three-dimensional (3-D) velocity field, to a depth of 4 km. The anomalous changes of the spatial velocity data outline the regional extent of the Late Miocene magmatic intrusions, which are covered by over 2000 m of Mid-Miocene to Pleistocene clastics. Complex relationship was found between the surface potential data and the intrusive bodies. This multi-faceted geophysical data analysis established a functional technique for mapping a subsurface with intricate acoustic and structural complexity. |
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| Keywords: | Wide-angle seismic Low frequency Three-dimensional Tomographic inversion Seismic-potential data synthesis Pannonian basin |
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