Empirical relationships between macroseimic intensity and instrumental ground motion parameters for the intermediate-dep
- PDF / 7,408,103 Bytes
- 23 Pages / 439.37 x 666.142 pts Page_size
- 39 Downloads / 184 Views
Empirical relationships between macroseimic intensity and instrumental ground motion parameters for the intermediate‑depth earthquakes of Vrancea region, Romania Luminita Ardeleanu1 · Cristian Neagoe1 · Constantin Ionescu1 Received: 8 November 2019 / Accepted: 13 May 2020 © Springer Nature B.V. 2020
Abstract Empirical relationships between MSK macroseismic intensity and several engineering ground motion parameters are developed using the macroseismic and instrumental data available for five significant earthquakes (Mw magnitude 6 and above), which occurred during the past half-century in Vrancea region, Romania. The relations are suitable for the Carpathian bend zone and surroundings, and they are valid for intensity values between 5 and 8; in this range, the MSK intensity is basically defined by the level of structural damage. The capability of the selected ground motion parameters to predict the macroseismic intensity is evaluated by observing the standard deviations associated with the proposed regression models. Generally, the parameters which take into account the ground motion duration appear to be more stable predictors than the parameters based on the peak ground motion. The most reliable damage indicator appears to be the Arias intensity. The proposed regression relationships provide intensity predictions with uncertainty close to one-half unit; therefore, they are reliable tools for rapid loss estimation and emergency response coordination following a strong earthquake of Vrancea region. The derived equations represent also useful instruments for seismic risk assessment by methodologies based on macroseismic intensity, since in current practice the earthquake hazard and seismic impact are mainly given in terms of engineering ground motion parameters. Keywords MSK macroseismic intensity · Engineering ground motion parameters · Empirical intensity—ground motion relationships · Intensity predictive equations · Undercrustal earthquakes · Vrancea region
* Luminita Ardeleanu [email protected] Cristian Neagoe [email protected] Constantin Ionescu [email protected] 1
National Institute for Earth Physics, 12 Calugareni Str, P. O. Box MG‑2, 077125 Magurele, Ilfov, Romania
13
Vol.:(0123456789)
Natural Hazards
1 1. Introduction The Vrancea region, Romania, is one of the most active intracontinental earthquakeprone areas in Europe. The intermediate-depth seismic source—which may produce one-to-six strong earthquakes (Mw ≥ 7) during a century, according to the existing historical catalogues (e.g., Oncescu et al. 1999)—is located at the bend of the Southeastern Carpathians, at the contact of three tectonic units: the East-European plate, the Intra-Alpine subplate and the Moesian platform. The shocks occur within a narrow, vertically elongated volume, in the depth range 70–180 km, with few events above and below (see Fig. 1). During the past half-century, four earthquakes with moment magnitude greater than 6 occurred in the region: on March 4, 1977 (Mw 7.4), August 30, 1986 (Mw 7.1), May 30, 1990 (Mw 6.9)
Data Loading...
