Crustal velocity structure under the RUKSA seismic array (Karelia, Russia)

I. M. Aleshin, G. L. Kosarev, and O. Yu. Riznichenko
Institute of Physics of the Earth, Russian Academy of Sciences, Moscow, Russia

I. A. Sanina
Institute for Dynamics of Geospheres, Russian Academy of Sciences, Moscow, Russia


[1]  Based on data of three three-component seismographs belonging to the temporary small-aperture Russian Karelia Seismic Array (RUKSA) in the Petrozavodsk region (Karelia), a 1-D velocity model of the crust is constructed by the method of the receiver function. Waveforms of distant earthquakes recorded by short-period instruments with improved characteristics are used. The data were inverted by the simulated annealing method. The inversion was stabilized by using phase velocities of Rayleigh waves and traveltimes of converted Ps waves from the 410-km boundary determined from broadband records of the SVEKALAPKO seismic array. Anomalously low seismic velocities are discovered in the upper part of the cross section beneath the RUKSA array.

Received 15 February 2006; revised 1 March 2006; accepted 9 March 2006; published 14 March 2006.

Keywords: Earth's crust, small aperture array, method of the receiver function.

Index Terms: 7205 Seismology: Continental crust; 7255 Seismology: Surface waves and free oscillations; 7294 Seismology: Seismic instruments and networks.


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