A refined catalogue of focal mechanisms for the Intra‑Carpathian region of Romania: implications for the stress field and seismogenic features assessment

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Published: Feb 21, 2023
DOI: https://doi.org/10.4401/ag-8387
Keywords:
Seismological data, Focal Mechanisms, Stress, Waves and wave analysis, Seismotectonics

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Eugen OROS
National Institute for Earth Physics, Magurele 077125, Ilfov, Romania
Mihaela Popa
Daniel Paulescu
Anica Otilia Placinta
Cristian Ghita

Abstract

We present a refined and the most complete catalogue of the focal mechanisms for the Intra-Carpathian region of Romania. It contains the high-quality solutions computed for 1217 earthquakes recorded between 1909 and 2018. Primary data gathered from the original seismograms and seismic bulletins have been used to compute the source parameters and focal mechanisms solutions. The focal mechanisms have been obtained using the HASH method by the polarities and S/P amplitudes ratios inversion. Our catalogue provides data necessary for the investigation of the contemporary stress field at different scales with high spatial and temporal resolution. We determined the stress field characteristics through formal inversion of focal mechanisms and also computed the reactivation potential of the active fault systems using the Win‑Tensor program. The stress field is heterogeneous, with SHmax significantly deviating from the first-order stress field direction and also with strong local variations in the stress regime.

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How to Cite
OROS, E., Popa, M., Paulescu, D., Placinta, A. O. and Ghita, C. (2023) “A refined catalogue of focal mechanisms for the Intra‑Carpathian region of Romania: implications for the stress field and seismogenic features assessment”, Annals of Geophysics, 65(6). doi: 10.4401/ag-8387.
Issue
Vol. 65 No. 6 (2022)
Section
Seismology
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