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CROSS-CORRELATION TECHNIQUE USED TO DISCRIMINATE THE QUARRIES BLASTS RECORDED IN DOBROGEA (ROMANIA) DURING 2012 – 2016 TIME INTERVAL

R. Dinescu, M. Rogozea, M. Popa, A. Chircea
Thursday 11 October 2018 by Libadmin2018

ABSTRACT

The most important products of the seismological network are complete and reliable earthquake catalogs. Detecting earthquakes over an extended scale, from smallest magnitudes to large events is a critical issue in many studies, such as earthquake statistics, source seismology and seismic hazard.
During the last years, the seismic network of Romanian has developed by increasing the number of stations and station coverage. Despite the significant improvement, the coverage is still not uniform all over the Romanian territory due to some natural limits (geographical borders, topography, etc.). Because of this, the monitoring and localization of local seismic events with low-magnitude using routine detection and localization methods is sometimes difficult and may lead to considerable magnitude or location errors. Recorded data affected by errors and quarry blasts recorded as seismic events (earthquakes) in the Romanian earthquake catalogue (ROMPLUS) will distort the seismicity pattern characterizing a specific region.
The goal of this study is to increase the capability to detect and localize low-magnitude seismic events in the south-eastern part of Romania (Dobrogea region) by applying the cross-correlation method for 2012 – 2016-time interval. To this aim, we selected six templates for events recorded both during working hours and during night. The waveform similarity analysis was performed on signals recorded on the vertical component of the seismic station Targusor (TIRR), a high-quality station operating in the study region. The waveforms recorded for template events are cross-correlated with successive windows from the continuous waveform recording along the entire time interval selected for our analysis. Window length and filtering parameters are properly adjusted in order to detect similarities among the waveforms of different events in connection with each template event. Finally, the detected events are investigated in order to discriminate tectonic events from man-made events following specific criteria: working hours, working days, monthly distribution, magnitude and depth of the event correlation with specific templates. The catalogue resulted from this work is analysed comparatively with the existing routine catalogue for Dobrogea.

Keywords: Dobrogea, earthquakes, quarry blasts, cross-correlation method, discrimination


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