UNIVERSITY OF BUCHAREST
FACULTY OF PHYSICS

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Conference: Bucharest University Faculty of Physics 2022 Meeting


Section: Atmosphere and Earth Science; Environment Protection


Title:
identification of quarry blasts in the dobrogea area based on seismological data


Authors:
Andreea CHIRCEA(1,4), Raluca DINESCU(1,2), Mihaela POPA(1,3), Daniela GHICA(1)


*
Affiliation:
1. National Institute for Earth Physics, Magurele, Romania

2. University of Bucharest, Faculty of Geology and Geophysics, Bucharest, Romania

3. Academy of Romanian Scientists, Romania

4. University of Bucharest, Faculty of Physics, Magurele, Romania



E-mail
andreeachircea@gmail.com


Keywords:
seismology, quarry blasts, discrimination methods


Abstract:
The most important products of the seismological network are the complete and reliable earthquake catalogues. Data affected by errors and quarry blasts recorded as seismic events in the Romanian earthquake catalogue (ROMPLUS), will distort the seismicity model that characterizes a certain region, being a critical issue in many studies, such as earthquake statistics, seismic source and seismic hazard. The main objective of this study was to identify the quarry blasts recorded as seismic events in the ROMPLUS catalogue (Popa et al., 2022). We used seismic recordings from the Dobrogea area, Romania, which occurred between 2012 and 2016 Approximatively 74 quarries were identified in the study region, all these representing controlled sources of explosions. According to the events recorded by the Romanian Seismic Network (RSN) stations, in the Dobrogea region we have both anthropic and tectonic events, and the correct discrimination and association of the type of event is crucial for an accurate and reliable catalogue of earthquakes. We first applied multiple statistical discrimination methods (Dinescu R. et al, 2018). Almost 90% of the data set analyzed results may be due to human activities. These events can be considered as templates for the automatic detection of events with the same type of source in the cross-correlation technique (Goldstein, P. et al.,2003). We applied the cross-correlation technique using six `template` waveforms. Only for four of the events with a correlation coefficient (CC) of 0.850 representing a similarity of 85% with the waveform used as a template were identified. By applying the statistical methods and the cross-correlation technique a significant number of events were detected during the working days and hours and with a very high correlation coefficient. These events will be considered as quarry blasts in the catalogue. The study will be continued by extending the data set to the entire instrumental period of the catalogue data for this area and later for other areas in the country.


References:

1. Bormann, P. (Ed.) [2013] New Manual of Seismological Observatory Practice (NMSOP-2), Potsdam: Deutsches GeoForschungszentrum GFZ, IASPEI;

2. Dinescu R., Rogozea M., Popa M., Chircea A., Cross-Correlation Technique used to discriminate the quarrie blasts recorded in Dobrogea (Romania), 18th International Multidisciplinary GeoConference SGEM, 2018.

3. Goldstein, P., Dodge, D., Firpo, M., Minner, L. [2003] SAC2000: Signal processing and analysis tools for seismologists and engineers, Invited contribution to "The IASPEI International Handbook of Earthquake and Engineering Seismology”, Edited by WHK Lee, H. Kanamori, P.C. Jennings, and C. Kisslinger, Academic Press, London;

4. Popa M., Chircea A., Dinescu R., Neagoe C., Grecu B. (2022), Romanian Earthquake Catalogue (ROMPLUS), Mendeley Data, V1, doi: 10.17632/tdfb4fgghy.1



Acknowledgement:
This paper has been accomplished through the NUCLEU Program supported by the Ministry of Research, Innovation and Digitization, MULTIRISC project, PN 19080101: “Multidisciplinary research to characterize seismic and acoustic events using specific analysis techniques”