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NEAR REAL TIME EARTHQUAKE PARAMETERS ESTIMATION

George Marius Craiu, Andreea Craiu, Nicu Marius Mihai, Alexandru Mărmureanu

Abstract

The seismicity of Romania is significantly affected by earthquakes produced by the Vrancea seismic source with intermediate depth events (3 shocks/century with magnitude Mw greater than 7.0). The seismic activity on the Romanian territory consists of both shallow and intermediate-depth earthquakes. The crustal seismicity is moderate and more scattered in comparison with the intermediate-depth one. The recent upgrade of the seismic network in Romania with high dynamic range velocity sensors (150 real time seismic stations equipped with broadband and short period sensors) allows recording of moderate to large magnitude earthquakes at very close epicentral distances (less than 10-20 km). The purpose of this work consists mainly in the estimation of moment magnitude Mw along with other source parameters (M0, f0, and the focal mechanisms) using the velocity network of the NIEP. A stable and automatic method was developed by [1] and has been implemented in the real time data acquisition and processing system (ANTELOPE) [2] to estimate in real time the seismic moment, the moment magnitude and the corner frequency of events recorded by the velocity sensors, using Andrews (1986) method applied to S waves [3]. The main goals are the independent estimation of seismic moment and the common characterization for all events recorded by the velocity network. In this study were analyzed 329 seismic events recorded in Romania with 1.7?ML?6.0, during 2004-2021.

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DOI resolver: doi.org/10.5593/sgem2021/1.1/s05.096

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