Seismic Intensity Estimation Using Macroseismic Questionnaires and Instrumental Data—Case Study Barlad, Vaslui County
In the last decade, many efforts were done to predict the macroseismic intensity in case of felt Vrancea earthquakes and additionally an online environment was developed for the automatic approximation of the intensity from peoples’ feedback. Besides the extended scientific studies, the near real-time estimation of the macroseismic intensity recently became mandatory for the insurance companies to cover some of the losses and damages that earthquakes might cause to houses, belongings, and other structures. Due to the insurance companies’ requests, the macroseismic questionnaires method was doubled by the seismic intensity determination using instrumental data, as recommended in the Romanian Seismic Intensity Scale Standard (STAS 3684-71). In the present study, the procedure is shown, for the last earthquakes with ML larger than 5.0, occurred in Vrancea zone, and felt on the extra-Carpathian area. We have selected the case study in Barlad, Vaslui county, because there have been recorded the largest accelerations (122 cm/s2) and have been reported the largest MSK intensities (VI) from Romania during the Mw 5.5 September 24, 2016 earthquake. The results obtained using the two approaches (macroseismic and instrumental data) have been compared and some differences have been found.
KeywordsIntensity data points (IDPs) Vrancea earthquakes Peak ground acceleration (PGA)
This paper was partially carried out within Nucleu Program, supported by ANCSI, projects no. PN 16 35 01 06, PN 16 35 03 01, PN 16 35 01 01 and the Partnership in Priority Areas Program—PNII, under MEN-UEFISCDI, DARING Project no. 69/2014 and a grant of the Romanian National Authority for Scientific Research and Innovation (ANCSI)—UEFISCDI, project number PN-II-RU-TE-2014-4-0701.
- Constantin AP, Moldovan IA, Craiu A, Radulian M, Ionescu C (2016) Macroseismic intensity investigation of the November 2014, M = 5.7, Vrancea (Romania) crustal earthquake. Ann Geophys 59(5):S0542Google Scholar
- Enescu BD, Enescu D (1999) The Vrancea earthquake of May 31, 1990 (Mgr = 6.1). Isoacceleration maps of ground movement and macroseismic maps. Rom Journ Phys 44(5–6):645–653Google Scholar
- Ionescu C, Dragoicea M (2010) Macroseis: a tool for real-time collecting and querying macroseismic data in Romania. Rom Journ Phys 55(7–8):852–861Google Scholar
- Mărmureanu G, Cioflan CO, Mărmureanu A (2011) Intensity seismic hazard map of Romania by probabilistic and (neo) deterministic approaches, linear and nonlinear analyses. Rom Rep Phys 63(1):226–239Google Scholar
- Moldovan IA (2007) Metode si modele statistice in seismologie. Bucuresti, Editura Morosan, p 236Google Scholar
- Moldovan IA, Diaconescu M, Popescu E, Radulian M, Toma-Danila D, Constantin A, Placinta A (2016) Input parameters for the probabilistic seismic hazard assessment in the Eastern part of Romania and Black Sea Area. Rom Journ Phys 61(7–8):1412–1425Google Scholar
- Moldovan IA, Diaconescu M, Partheniu R, Constantin AP, Popescu E, Toma-Danila D (2017) Probabilistic seismic hazard assessment in the Black Sea Area, Rom Journ Phys 62(5–6):809Google Scholar
- STAS 3684-71 (1971) Seismic intensity scale. Romanian Institute for Standardization, IRS, Bucharest (in Romanian)Google Scholar
- Vacareanu R, Aldea A, Lungu D, Pavel F, Neagu C, Arion C, Demetriu S, Iancovici M (2016) Probabilistic seismic hazard assessment for Romania. In: Earthquakes and their impact on society, Springer International Publishing, pp 137–169Google Scholar