Vrancea intermediate-depth focal mechanism catalog

Published: 20 March 2023| Version 1 | DOI: 10.17632/v6jssh9n63.1


Parameters of the focal mechanism catalog for Vrancea (Romania) intermediate-depth earthquakes (2005-2020). Here we report the following: date (year/month/day), time (hh:mm:ss), lat (latitude north in degrees) and long (longitude east in degrees), depth (km), Mw (magnitude), Strike1, Dip1 and Rake1 (strike, dip, rake of the first fault plane in degrees), Strike2, Dip2 and Rake2 (strike, dip, rake of the second fault plane in degrees), P-a, P-p, T-a, T-p ( P and T axis, azimuth and plunge angle in degrees), SHmax, Shmin (azimuth), R’ (stress regime index), SR( Stress regime), Nr P (number of polarities), Err P (errors of polarities).


Steps to reproduce

We used a relocated data set that was obtained by manually picking and location (Hypocenter code /Seisan software (Havskov and Ottemöller, 2020). The fault plane solutions have been obtained on the basis of the first motion of P-wave polarities using FOCMEC code developed by Snoke et al. (1984), distributed as part of the FOCMEC package (http://www.geol.vt.edu/outreach/vtso/focmec) and incorporated in SEISAN software (Havskov and Ottemöller, 2020). The solutions estimated from P-wave polarities were obtained by using no less than 10 observations, this, in the first part of the catalog, where the number of stations was small, following that the number of polarities increased, with improving the number of stations installed in the Romanian Seismic Network, therefore its confidence level is considerable.


Institutul National de Cercetare-Dezvoltare pentru Fizica Pamantului


Earth Sciences, Seismology, Earthquake Hazard, Earthquake