POLENET / LAPNET



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The POLENET / LAPNET

The POLENET/LAPNET is a sub-project of the POLENET-IPY consortium related to POLENET seismic and geodetic studies in the Arctic regions. POLENET/LAPNET activities will be carried out on the territory of northern Fennoscandia (Finland, Sweden, Norway and Russia). The project was developed on the base of Expression of Intent for IPY No. 34 that received approval from the IPY Joint Committee and recommendation to join the POLENET project cluster.

The main target of the POLENET/LAPNET project is to carry out a temporary broadband seismic array research in the area of northern Finland, Sweden, Norway and Russia. The array consisted of 37 temporary stations, 4 permanent broadband stations of Oulu University, 5 permanent stations operated by the Institute of Seismology of Helsinki University, 10 permanent stations of Swedish National Seismological Network, one station of Bergen University and one station of NORSAR. The array registered teleseismic, regional and local events during May,2007-September,2009.

The study will contribute to the POLENET multidisciplinary research in northern Fennoscandia by collecting waveforms of seismic phases travelling through the core and recordings of glacial earthquakes. The waveform data will be compiled into a database that will be available to world geophysical community and interpreted by different techniques.

The research aims to obtain a 3D seismic model of the crust and upper mantle down to 670 km (P- and S-wave velocity models, position of major boundaries in the crust and upper mantle and estimates of seismic anisotropy strength and orientation) in northern Fennoscandian Shield, in particular, beneath the Archaean domain of the Fennoscandian Shield. The 3-D model can be used to define spatial distribution and depth of the Archaean lithosphere for the purpose of diamond prospecting. The 3-D model of the crust and upper mantle will be also used to improve registration and location of local earthquakes and understanding of mechanisms of local seismicity in northern Fennoscandia.