Published June 7, 2024
| Version v1
Dataset
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The new catalogue of Focal Mechanisms in the Western Ionian Sea (WISeFM_1990-2019)
- 1. Istituto Nazionale di Geofisica e Vulcanologia (INGV)
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Description
We computed new 421 focal solutions (1.5≤ML≤4.7), with rays traced through the 3D velocity model of Sgroi et al. 2021 (https://doi.org/10.1038/s41598-020-79719-8), of events occurred in the western Ionian Sea in the period between 1990 and 2019. Earthquakes were recorded by the land seismic network managed by the INGV and by a seafloor network, comprising the NEMO-SN1 seafloor observatory (October 2002 – February 2003; June 2012 - June 2013) and 7 Ocean Bottom Seismometers (OBS) deployed during the SEISMOFAULTS experiment (April 2017 – April 2018).
Methods (English)
We collected basic data (travel times) from available datasets (ISIDe Working Group, 2007) and published studies (Sgroi et al., 2021) and processed them using the tomoDDPS algorithm (Zhang et al., 2009) and the 3D velocity model of Sgroi et al. (2021, https://doi.org/10.1038/s41598-020-79719-8). By using FPFIT software (Reasenberg and Oppenheimer, 1985), we obtained 421 focal solutions with an average uncertainty on the orientation of the nodal planes of about 10°. These focal mechanisms can be considered representative of the kinematics characterising the western Ionian Sea and the eastern Sicily and south Calabria coasts, since they are distributed in all the main seismogenically active areas of the region.Technical info (English)
The table (WISeFM_1990-2019) shows focal parameters of the analysed earthquakes. Specifically: ID = identification number; DATE (year-month-day); Origin Time (hour, minute, second and cent); LAT = latitude north in degrees; LONG = longitude east in degrees; DEPTH in km; ML= magnitude; N = number of polarities; PLANE 1 (STRK, DIP, RAKE), PLANE 2 (STRK, DIP, RAKE) = strike, dip and rake of the first and the second nodal plane; P-AXIS (STRK, DIP), T-AXIS (STRK, DIP) = strike and dip of the P- and T-axes; Q = quality of the focal mechanism (2 = best quality; 1 = medium quality; 0 = low quality); CAT = category (NF = normal fault, NS = normal-strike, SS = strike-slip, TF = thrust fault, TS = thrust-strike, HV = horizontal-vertical).Files
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