1887

Abstract

A method for iterative construction of a consistent environmental model, based on the data obtained by three seismic methods: CDP, DSS and ESM, is proposed. The method was tested in the northern portion of geotraverse EB-1, in the Pechenga Ore Province and in Central Karelia, where primary seismic data were obtained using all three methods. The travel times of P- and S-waves were used to construct a deep tomographic model of the Pechenga Ore Province with the Kola Superdeep Borehole in its centre. It was found that here the earth crust falls into an upper, "heterogeneous", portion and a lower, "homogeneous", portion and that at a depth of 8-12 km there occurs the same type of inversion of the velocities of P- and S- waves, which continues into the southern portion of the Barents Sea shelf plate. CDP, ESM and DSS data were interpreted to determine the position and structure of M-discontinuity in the Pechenga Province, which lies at a depth of 34-40 km. It is important that the smallest depths of M-discontinuity correspond to the Pechenga structure and that the depth contours delineate oval and elongate anomalies that fit the general tectonic plan of the Pechenga Ore Province from the riftogenic to postcollisional stage in the evolution of the Karelides. It is recommended to conduct regional studies on profiles by a combination of seismic methods which includes deep CDP observation and three-component DSS and ESM recording. The results of these studies provide different information which makes the picture more complete.

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/content/papers/10.3997/2214-4609-pdb.20.P127
2006-10-16
2020-09-18
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http://instance.metastore.ingenta.com/content/papers/10.3997/2214-4609-pdb.20.P127
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