The depths of mineralogical phase transitions in the mantle (at ~410 and ~660 km depth)
offer crucial insights into the thermal conditions of the mantle transition zone and,
by extension, the upper mantle's state and circulation. Our approach involves conducting
P-to-S receiver function analysis to determine the mantle transition zone's thickness
and the absolute depths of the ~410 km and ~660 km discontinuities in the Central
and Eastern European region.Our workflow meticulously attends to each step, starting
from data download, quality control, and culminating in the calculation of P-to-S
receiver functions. We use data from multiple sources, including the AlpArray and
AdriaArray Seismic Networks, the PACASE, Carpathian Basin, and South Carpathian Project
temporary seismic networks, as well as the permanent stations of the Hungarian National
Seismological network and of the neighboring countries. This analysis covers the time
period from 2002 to 2023, involving over 860 seismological stations. Our extensive
dataset, consisting of approximately 2 million three-component waveforms and over
120,000 high-quality P-to-S radial receiver functions, coupled with dense piercing-point
coverage, allows us to achieve unprecedented resolution.We present Common Conversion
Point cross-sections migrated with a 3D tomographic velocity model underneath the
Alps, Carpathians, and the Pannonian Basin. Additionally, we aim to offer new insights
into the mantle transition zone's thickness beneath intriguing regions (e.g., Vrancea
zone, Alpine Tethys Ocean zone, Eastern Alps–Pannonian Basin transition zone). For
a precise understanding of geodynamic processes such as slabs, mantle plumes, and
volcanism, it is imperative to accurately map these boundaries.
