Abstract
<p>In this paper, the macroseismic effects of the subcrustal earthquake in Vrancea (Romania) that occurred on March 4, 1977, have been re-evaluated. This was the second strongest seismic event that occurred in this area during the twentieth century, following the event that happened on November 10, 1940. It is thus of importance for our understanding of the seismicity of the Vrancea zone. The earthquake was felt over a large area, which included the territories of the neighboring states, and it produced major damage. Due to its effects, macroseismic studies were developed by Romanian researchers soon after its occurrence, with foreign scientists also involved, such as Medvedev, the founder of the Medvedev-Sponheuer-Karnik (MSK) seismic intensity scale. The original macroseismic questionnaires were re-examined, to take into account the recommendations for intensity assessments according to the MSK-64 macroseismic scale used in Romania. After the re-evaluation of the macroseismic field of this earthquake, the intensity dataset was obtained for 1,620 sites in Romanian territory. The re-evaluation was necessary as it has confirmed that the previous macroseismic map was underestimated. On this new map, only the intensity data points are plotted, without tracing the isoseismals.</p>
Highlights
Nowadays, great attention is given to re-evaluation studies of macroseismic information associated to earthquakes that occurred in the pre-instrumental and instrumental eras. These studies imply reinterpretation of the macroseismic effects produced mainly by major subcrustal earthquakes that occurred in Romanian territory
This earthquake was one of the strongest that has occurred in Romania, with the epicenter in the south-eastern Carpathian bend, a region known as the Vrancea seismogenic zone
The seismicity of the Romanian territory and its specific pattern is strongly determined by the Vrancea seismogenic zone
Summary
Great attention is given to re-evaluation studies of macroseismic information associated to earthquakes that occurred in the pre-instrumental and instrumental eras These studies imply reinterpretation of the macroseismic effects produced mainly by major subcrustal earthquakes that occurred in Romanian territory. The purpose of this paper was to re-evaluate the macroseismic effects of the subcrustal Vrancea earthquake that occurred during the evening of March 4, 1977 This earthquake was one of the strongest that has occurred in Romania, with the epicenter in the south-eastern Carpathian bend, a region known as the Vrancea seismogenic zone. The seismicity of the Romanian territory and its specific pattern is strongly determined by the Vrancea seismogenic zone This region is characterized by strong subcrustal earthquakes (MW >7.0), the frequency of occurrence of which is low (4-5 destructive earthquakes per century). The last earthquake that occurred in this region was the October 27, 2004, subcrustal earthquake [Romplus catalog 2011], which was the only significant event over the last two decades, both in terms of magnitude (MW 6) and observed macroseismic effects
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