Identification of blasting sources in the Dobrogea seismogenic region,Romania using seismo-acoustic signals |
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| Institution: | 1. Lightning Protection Center of Hainan Province, 60 Haifu Road, Haikou 570203, PR China;2. Cold and Arid Regions Environmental and Engineering Research Institute, Chinese Academy of Sciences, 32 Donggang West Road, Lanzhou 730000, PR China;1. University of Bari, Department of Physics, Bari, Italy;2. Department of Industrial Engineering, University of Tor Vergata, Rome, Italy;3. Arpa Emilia Romagna, Reggio Emilia, Italy;4. National Institute of Earth''s Physics, Seismological Department, Bucharest, Magurele, Romania;5. Geophysical Centre of Évora and Physics Department, ECT, University of Évora, Portugal;6. Department of Surveying & Geodesy, University of Thessaloniki, Thessaloniki, Greece;7. Department of Geophysics, University of Thessaloniki, Thessaloniki, Greece;8. Department of Computer Science and Engineering, European University Cyprus, Nicosia, Cyprus;9. Department of Geophysics, Canakkale Onsekiz Mart University, Canakkale, Turkey;10. Department of Physics, University of Malta, Malta;1. Department of Electrical Engineering and Computer Science, University of Michigan, USA;2. Department of Mathematics, Simon Fraser University, Canada |
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| Abstract: | In order to discriminate between quarry blasts and earthquakes observed in the Dobrogea seismogenic region, a seismo-acoustic analysis was performed on 520 events listed in the updated Romanian seismic catalogue from January 2011 to December 2012. During this time interval, 104 seismo-acoustic events observed from a distance between 110 and 230 km and backazimuth interval of 110–160° from the IPLOR infrasound array were identified as explosions by associating with infrasonic signals. WinPMCC software for interactive analysis was applied to detect and characterize infrasonic signals in terms of backazimuth, speed and frequency content. The measured and expected values of both backazimuths and arrival times for the study events were compared in order to identify the sources of infrasound. Two predominant directions for seismo-acoustic sources’ aligning were observed, corresponding to the northern and central parts of Dobrogea, and these directions are further considered as references in the process of discriminating explosions from earthquakes. A predominance of high-frequency detections (above 1 Hz) is also observed in the infrasound data. The strong influence of seasonally dependent stratospheric winds on the IPLOR detection capability limits the efficiency of the discrimination procedure, as proposed by this study. |
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| Keywords: | Quarry blasts Seismicity Seismo-acoustic Infrasound array Discrimination Romania |
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