Abstract
The tectonic settings investigated by several seismic projects in previous research targeting the structure in Central Poland mainly focused on the Earth’s crust. In this paper, we present P-wave velocity verification in the uppermost mantle beneath LUMP profile towards SSE-NNW. Using recordings of 36 DATA-CUBE recorders from ca. 300–490 km far earthquake in coal mine “Janina” in southern Poland, we calculated travel times to verify P-wave velocity below the Moho boundary from previous studies. It shows that a significantly lower mean velocity value should be used for the upper mantle while counting these offsets of travel times in the SSE-NNW direction than that used on previous profiles. We present two possible models: first, the most simple one that fits the observed first arrivals, and the second with a low-velocity layer beneath the Moho boundary. In both cases, we used a priori crustal model focusing only on P-wave velocity in the uppermost mantle. Both of them significantly improved adjustment of travel times to the observed data. To evaluate the tendency of adopting too high velocities beneath the Moho, we used also 11 broadband stations, Reftek 151-121 “Observer”, from “13 BB Star” passive experiment and 6 STS-2 seismometers from permanent stations of the Polish Seismological Network (PLSN).
Highlights
The tectonic structure in Poland, where the East European Craton and Palaeozoic Platform are divided by the TransEuropean Suture Zone, is complicated (Fig. 1)
Assuming well-investigated crustal structures, we present an attempt to examine P-wave distribution below the Moho boundary or discontinuity based on Libiąż Uppermost Mantle Profile (LUMP profile)
To exclude the fact that these velocities are too high for the whole model, we show that for Polish Seismological Network (PLSN) for two stations its values are too small and for one station the travel time difference is really small
Summary
The tectonic structure in Poland, where the East European Craton and Palaeozoic Platform are divided by the TransEuropean Suture Zone, is complicated (Fig. 1). Keywords Upper mantle structure · Central Poland · P-wave velocity · Seismic profile
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