Abstract
On November 22, 2014 at 21:14:17 local hour (19:14:17 GMT) a M<sub>L</sub>=5.7 crustal earthquake occurred in the area of Marasesti city of Vrancea county (Romania) - the epicenter was located at north latitude 45.87° and east longitude 27.16°, with a focal depth of 39 km. This earthquake is the main shock of a sequence that started with this and lasted until the end of January. During the sequence, characterized by the absence of foreshocks, a number of 75 earthquakes were recorded in 72 hours, the largest of which occurred in the same day with the main shock, at 22:30 (M<sub>L</sub>= 3.1). The crustal seismicity of Vrancea seismogenic region is characterized by moderate earthquakes with magnitudes that have not exceeded M<sub>W</sub> 5.9, this value being assigned to an earthquake that occurred in historical times on March 1, 1894 (Romplus catalogue). Immediately after the 2014 earthquake occurrence, the National Institute for Earth Physics (NIEP) sent macroseismic questionnaires in all affected areas, in order to define the macroseismic field of ground shaking. According to macroseismic questionnaires survey, the intensity of epicentral area reached VI MSK, and the seismic event was felt in all the extra-Carpathian area. This earthquake caused general panic and minor to moderate damage to the buildings in the epicentral area and the northeast part of country. The main purpose of this paper is to present the macroseismic map of the earthquake based on the MSK-64 intensity scale.
Highlights
Macroseismic intensity obtained through the quantification of the earthquakes effects is an important parameter for seismological and seismic engineering research, government officials/institutions and earthquake insurance programs
As it can be seen in this figure, 240 intensity data points (IDPs) have an intensity value of IV MSK degrees
The ML 5.7 earthquake occurred on November 22, 2014, close to Mărăşeşti city was the strongest crustal earthquake that occurred in the Vrancea seismic region in the last century, both regarding magnitude and macroseismic effects
Summary
Macroseismic intensity obtained through the quantification of the earthquakes effects is an important parameter for seismological and seismic engineering research, government officials/institutions and earthquake insurance programs. The major earthquakes produced in the Vrancea subcrustal source are destructive over vast areas, extending significantly beyond the country’s border [i.e., Pantea and Constantin 2011, Kronrod et al 2013, Pantea and Constantin 2013, Constantin 2015] For this reason, the database of associated macroseismic maps is relatively rich for these earthquakes, including instrumentally recorded and historical events. 2. Geological and seismotectonic settings of the area The seismic sequence that occurred in 2014 in the proximity of Marasesti belongs to the seismicity characterizing the foredeep region of the South-Eastern Carpathians. The felt area was relatively wide, through the extra-Carpathian area, and as far as Ukraine, Rep. of Moldova, southern Bulgaria and south-eastern Turkey (www.emsc-csem.org)
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