Abstract
During the last decade Romanian Seismic Network has been significantly improved. A total number of 114 3-C seismic stations and the 2 seismic arrays ensure a good coverage of seismically active regions. As a consequence, the detection threshold decreased allowing location with higher accuracy of low magnitude (ML ~1.0) seismic events. This led to a contamination of Romanian earthquakes catalog with artificial events occurred in different regions. The goal of the present study is to apply various discrimination methods like: spectral and amplitude ratio techniques, complexity factor evaluation and a multi-parameter discriminant on a data set characterized by lower magnitudes events recorded between 2011 and 2015. The selected data consists of small events occurred in the northern part of Romania in the neighborhood of Bucovina array (BURAR). The analysis was carried out on the waveforms recorded with a high signal to noise ratio using the vertical short period array components. Our results revealed that despite of some overlapping, these techniques show a good capacity to discriminate artificial by natural events for the study region.
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References
Arai N, Yosida Y (2004) Discrimination by short-period seismograms. International institute of seismology and earthquake engineering, Building Research Institute (IISEE), Lecture Note, Global Course, Tsukuba
Badescu D (2005) The evolution of the tectono-stratigraphy of the Eastern Carpathians during Mesozoic and Neogene times. Editura Economică, Bucharest (in Romanian)
Borleanu F, Popa M, Radulian M, Schweitzer J (2011) Slowness and azimuth determination for Bucovina array (BURAR) applying multiple signal techniques. J Seismolog 15(3):431–442
Demetrescu C, Andreescu M (1994) On the thermal regime of some tectonics units in a continental collision environment in Romania. Tectonophysics 230:265–271
Ghica DV (2011) Detection capabilities of the BURAR seismic array—contributions to the monitoring of regional and distant seismicity. J Seismolog 15(3):487–506
Gitterman Y, Shapira A (1993) Spectral discrimination of underwater explosions. Isr J Earth Sci 42:37–44
Goldstein P, Snoke A (2005) SAC availability for the IRIS community. Incorporated Inst Seismolog Data Manag Center Electron Newslett 7:1–6
Grigore A, Grecu B, Rizescu M, Ionescu C, Ghica D, Popa M (2004) A new seismic station in Romania: the Bucovina seismic array. Rev Roum Géophysique 48:69–72 (Bucharest)
Gupta IN, Chart W, Wagner RA (1992) A comparison of regional phases from underground nuclear explosions at East Kazakhand Nevada Test Sites. Bull Seismol Soc Am 82:352–382
Horasan G, Guney AB, Kusmezer A, Bekler F, Oğutcu Z, Musaoğlu N (2009) Contamination of seismicity catalogs by quarry blasts: an example from İstanbul and its vicinity, northwestern Turkey. J Asian Earth Sci 34(1):90–99
Ioane D, Ion D (2005) A 3D crustal gravity modelling of the Romanian territory. J Balkan Geophys Soc 8(4):189–198
Kekovali K, Kalafat D, Deniz P (2012) Spectral discrimination between mining blasts and natural earthquakes: application to the vicinity of Tunçbilek mining area, Western Turkey. Int J Phys Sci 7(35):5339–5352
Kim WY, Aharonian V, Abbers G, Lerner-Lam A, Richards P (1996) Discrimination of earthquakes and explosions in southern Russia using regional high-frequency data from IRIS/JSP Caucasus network. Bull Seismol Soc Am 87(3):569–588
Koch K, Fah D (2002) Identification of earthquakes and explosions using amplitude ratios: the Vogtland area revisited. Pure appl Geophys 159:735–757
Nicolescu A, Rosca V (1991) Romania. The Bouguer anomaly map, scale 1: 1,000,000. Geological Institute of Romania
Oncescu MC, Marza V, Rizescu M, Popa M (1999) The Romanian earthquakes catalogue between 984 and 1997. In: Wenzel F, Lungu D (eds) Vrancea earthquakes: tectonics, hazard and risk mitigation. Kluwer Academic Publishers, Kluwer, pp 43–47
Oğutcu Z, Horasan G, Kalafat D (2011) Investigation of microseismic activity sources in Konya and its vicinity, central Turkey. Nat Hazards 58:497–509
Raileanu V (2009) Caracterizarea geologica si parametrii elastici ai amplasamentelor statiilor seismologice si de accelerometere din reteaua Institutului National de C-D pentru Fizica Pamantului. In: Marmureanu G (coord.) Cercetari privind managementul dezastrelor generate de cutremurele romanesti, Editura Tehnopress, ISBN:973-702-701-9 (in Romanian)
Ursino A, Langer H, Scarfě L, Di Grazia G, Gresta S (2000) Discrimination of quarry blasts from tectonic earthquakes in the Iblean Platform (Southeastern Sicily). Atti del 19° Convegno del Gruppo Nazionale di Geofisica della Terra Solida, Consiglio Nazionale Delle Ricerche, Roma
Acknowledgements
This study was supported by AFTAC Research Project—FA70211C0015. Data used in the present study were provided by the National Institute for Earth Physics (Romania). The study was partly funded by the projects PN 09—30–0101 and PN 09—30-0102 of the Nucleu programe of the National Authority for Scientific Research and Innovation.
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Borleanu, F., Grecu, B., Popa, M., Radulian, M. (2016). Use of Various Discrimination Techniques to Separate Small Magnitude Events Occurred in the Northern Part of Romania. In: Vacareanu, R., Ionescu, C. (eds) The 1940 Vrancea Earthquake. Issues, Insights and Lessons Learnt. Springer Natural Hazards. Springer, Cham. https://doi.org/10.1007/978-3-319-29844-3_10
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DOI: https://doi.org/10.1007/978-3-319-29844-3_10
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