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Strong motion data are essential for seismic hazard assessment. To correctly understand and use this kind of data is necessary to have a good knowledge of local site conditions. Romania has one of the largest strong motion networks in Europe with 134 real-time stations. In this work, we aim to do a comprehensive site characterization for eight of these stations located in the eastern part of Romania. We make use of a various seismological dataset and we perform ambient noise and earthquake-based investigations to estimate the background noise level, the resonance frequencies and amplification of each site. We also derive the Vs30 parameter from the surface shear-wave velocity profiles obtained through the inversion of the Rayleigh waves recorded in active seismic measurements. Our analyses indicate similar results for seven stations: high noise levels for frequencies larger than 1 Hz, well defined fundamental resonance at low frequencies (0.15-0.29 Hz), moderate amplification levels (up to 4 units) for frequencies between 0.15 and 5-7 Hz and same soil class (type C) according to the estimated Vs30 and Eurocode 8. In contrast, the eighth station for which the soil class is evaluated of type B exhibits a very good noise level for a wide range of frequencies (0.0120 Hz), a broader fundamental resonance at high frequencies (~ 8 Hz) and a flat amplification curve between 0.1 and 3-4 Hz.
Wydawca
Czasopismo
Rocznik
Tom
Strony
153--165
Opis fizyczny
Bibliogr. 30 poz.
Twórcy
autor
- National Institute for Earth Physics, Măgurele, Romania
autor
- National Institute for Earth Physics, Măgurele, Romania
autor
- National Institute for Earth Physics, Măgurele, Romania
autor
- National Institute for Earth Physics, Măgurele, Romania
autor
- National Institute for Earth Physics, Măgurele, Romania
autor
- National Institute for Earth Physics, Măgurele, Romania
autor
- National Institute for Earth Physics, Măgurele, Romania
Bibliografia
- 1. Balan SF, Ioane D, Cioflan C, Panea I, Apostol B, Malita Z, Chitea F, Anghelache MA (2014) Scenarios for local seismic effects of Tulcea (Romania) crustal earthquakes—preliminary approach of the seismic risk characterization for Tulcea city. In: Bostenaru D, Armas M, Goretti A (eds) Earthquake hazard impact and urban planning. Springer, Dordrecht, pp 85–103
- 2. Bard PY (1999) Microtremor measurements: a tool for site effects estimation. In: Irikura K, Kudo K, Okada H, Sasatani T (eds) The effects of surface geology on seismic motion. Balkema, Rotterdam, pp 1251–1279
- 3. Dal Moro G (2008) VS and VP vertical profiling and poisson ratio estimation via joint inversion of Rayleigh waves and refraction travel times by means of bi-objective evolutionary algorithm. J Appl Geophys 66:15–24
- 4. Dal Moro G (2014) Surface wave analysis for near surface applications. Elsevier, Amsterdam, p 244
- 5. Dal Moro G, Ferigo F (2011) Joint analysis of Rayleigh and love wave dispersion for near-surface studies: issues, criteria and improvements. J Appl Geophys 75:573–589
- 6. Dal Moro G, Pipan M, Gabrielli P (2007) Rayleigh wave dispersion curve inversion via genetic algorithms and marginal posterior probability density estimation. J Appl Geophys 61(1):39–55
- 7. Diaz J, Villasenor A, Morales J, Pazos A, Cordoba D, Pulgar J, Garcia-Lobon JL, Harnafi M, Carbonell R, Gallart J, TopoIberia Seismic Working Group (2010) Background noise characteristics at the IberArray Broadband Seismic Network. Bull Seismol Soc Am 100(2):618–628
- 8. Evangelidis CP, Melis NS (2012) Ambient noise levels in Greece as recorded at the Hellenic Unified Seismic Network. Bull Seismol Soc Am 102(6):2507–2517
- 9. Field EH, Jacob KH (1995) A comparison and test of various site-response estimation techniques, including three that are not reference-site dependent. Bull Seismol Soc Am 85(4):1127–1143
- 10. Ghica DV, Grecu B, Popa M, Radulian M (2016) Identification of blasting sources in the Dobrogea seismogenic region, Romania using seismo-acoustic signals. Phys Chem Earth Parts A/B/C 95:125–134
- 11. Grecu B, Raileanu V, Bala A, Tataru D (2011) Estimation of site effects in the eastern part of Romania on the basis of H/V ratios of S and coda waves generated by Vrancea intermediate-depth earthquakes. Rom J Phys 56:563–577
- 12. Grecu B, Neagoe C, Tataru D (2012) Seismic noise characteristics at the Romanian broadband seismic network. J Earthq Eng 16(5):644–661
- 13. Grecu B, Negoe C, Tataru D, Borleanu F, Zaharia B (2016) Analysis of seismic noise in the Romanian-Bulgarian cross-border region (submitted to Journal of Seismology)
- 14. Grecu B, Neagoe C, Partheniu R, Nastase E, Zaharia B (2017) New seismic noise model for Romania, science and technologies in geology, exploration and mining. In: Proceedings of 17th International Multidisciplinary Scientific Geoconference, pp 285–292, Eds. STEF92 Technology Ltd (ISBN 976-619-7408-00-3)
- 15. Ibs-von Seht M, Wohlenberg J (1999) Microtremor measurements used to map thickness of soft sediments. Bull Seis Soc Am 89(1):250–259
- 16. Ionesi L (1989) Geologia Romaniei: unitati de platforma si orogenul Nord Dobrogean (translated title: The geology of Romania: platform units and the North-Dobrogean orogen). Thesis, Univ. Al. I. Cuza, Iasi, Romania. p 253 (in Romanian)
- 17. Konno K, Ohmachi T (1998) Ground-motion characteristics estimated from spectral ratio between horizontal and vertical components. Bull Seis Soc Am. 88(1):228–241
- 18. Lermo J, Chávez-García FJ (1993) Site effect evaluation using spectral ratios with only one station. Bull Seismol Soc Am 83(5):1574–1594
- 19. Matenco L, Bertotti G, Cloetingh S, Dinu C (2003) Subsidence analysis and tectonic evolution of the external Carpathian-Moesian Platform region during Neogene times. Sed Geol 156:71–94
- 20. McNamara DE, Buland RP (2004) Ambient noise levels in the continental United States. Bull Seis Soc Am 94:1517–1527
- 21. Nakamura Y (1989) A method for dynamic characteristics estimation of subsurface using microtremor on the ground surface. QR Railw Tech Res Inst 30:25–33
- 22. 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, Berlin, pp 43–47
- 23. Peterson J (1993) Observation and modeling of seismic background noise, U.S. Geol. Surv. Tech. Rept. 93–322, pp 1–95
- 24. Philips WS, Aki K (1986) Site amplification of coda waves from local earthquakes in central California. Bull Seism Soc Am 76:627–648
- 25. Popa M, Oros E, Dinu C, Radulian M, Borleanu F, Rogozea M, Munteanu I, Neagoe C (2016) The 2013 earthquake swarm in the galati area: first results for a seismotectonic interpretation. In: Vacareanu R, Ionescu C (eds) The 1940 Vrancea Earthquake. issues, insights and lessons learnt. Springer International Publishing, Switzerland. https://doi.org/10.1007/978-3-319-29844-3_17
- 26. Radulian M, Mandrescu N, Panza GF, Popescu E, Utale A (2000) Characterization of seismogenic zones of Romania. In: Panza G, Radulian M, Trifu C (eds) Seismic hazard of the Circum-Pannonian Region. Birkhäuser, Basel, pp 57–77
- 27. Raileanu V (2006) Annual report for the Contract no: 31 N/23.01.2006, Project—Advanced research of the disaster management of the strong Romanian earthquakes, Director of the project dr. Raileanu V., NIEP
- 28. Sandulescu M (ed) (1984) Geotectonica Romaniei (translated title: Geotectonics of Romania). Tehnica, Bucharest, p 335 (in Romanian)
- 29. Site Effects Assessment using Ambient Excitations (SESAME) European project (2005) Deliverable D23.12—Guidelines for the implementation of the H/V spectral ratio technique on ambient vibrations: measurements, processing and interpretation. http://www.sesame-fp5.obs.ujf-grenoble.fr
- 30. Stutzmann E, Schimmel M, Patau G, Maggi A (2009) Global climate imprint on seismic noise. Geochem Geophys Geosyst.
Uwagi
Opracowanie rekordu w ramach umowy 509/P-DUN/2018 ze środków MNiSW przeznaczonych na działalność upowszechniającą naukę (2018)
Typ dokumentu
Bibliografia
Identyfikator YADDA
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