One-dimensional P-wave velocity model for the territory of Hungary from local earthquake data

Gráczer, Z. and Wéber, Z. (2012) One-dimensional P-wave velocity model for the territory of Hungary from local earthquake data. Acta Geodaetica et Geophysica Hungarica, 47 (3). pp. 344-357. ISSN 1217-8977

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Abstract

We determined a new one-dimensional P-wave velocity model for the territory of Hungary based on the first arrival times of local earthquakes. During the computations 910 P-wave arrival data of 86 events from the time period between 1985 and 2010 have been used. The applied methodology is a combination of a genetic algorithm based procedure and an iterative linearized joint inversion technique. The preferred velocity profile has been chosen from the best models based on the data of a series of controlled explosions. The resulting flat-layered model consists of three crustal layers and a half-space representing the uppermost mantle. The crustal compressional velocities vary in the range of 5.3–6.3 km/s, while the uppermost mantle velocity was found to be 7.9 km/s. The Moho is located at an average depth of 26 km. Additionally, the Vp/Vs ratio was calculated by the Wadati-method, which gave a value of 1.74±0.05.

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