[SCG72-P11] A REVISION OF THE CUMULATIVE ABSOLUTE VELOCITY (CAV) THRESHOLD LEVEL VALUES FOR VRANCEA EARTHQUAKES
Keywords:Earthquake Early Warning, Cumulative Absolute Velocity
To enhance EEW capability and to decrease the effects of Vrancea earthquakes on the populated cities for Romania, in particular on Bucharest city, the relationships of the bracketed cumulative absolute velocity window (BCAV-W) approach versus epicentral distance and magnitude for Vrancea region were investigated, in 2013, within the scope of the Network of European Research Infrastructures for Earthquake Risk Assessment and Mitigation (NERA) project. With in the context of this study the rational threshold levels related to Mw=5.4+ earthquakes were given as 0.28 m/s and 0.34 m/s.
To advance the actual EEW capability further, in this study, the number of previously used data has been increased with few earthquakes M5+ and a dataset of about 150 acceleration records which consists of intermediate depth earthquakes with different magnitudes (4.0≤Mw≤6.0) and with epicentral distances of less than 200 km has been used. BCAV-W approach versus epicentral distance and magnitude for Vrancea region have been reinvestigated.
In conclude, new rational threshold levels related to Mw=5.6+ earthquakes have been determined as 0.28 m/s, 0.36 m/s and 0.48 m/s related to 8-second, 12-second and 16-second windows, respectively.