SEISMICITY of the CARPATHIANS in 2016–2017

Abstract

The article describes seismic observations in the Carpathian region in 2016–2017, which were carried out, as before, by two organizations from two states: in Ukraine – the seismicity department of the Carpathian region of the Institute of Geophysics of the NAS of Ukraine, in Moldova – the seismology laboratory of the Institute of Geology and Seismology of the Academy of Sciences of Moldova. In Ukraine, 20 stationary digital stations and 1 temporary in the area of Stebnik with a processing center in Lviv, in Moldova – six stations with a center in Chisinau. Different programs, local hodographs and magnitudes were used. The consolidated catalog of earthquakes was created in Lviv. A maps of epicenters and a table of the distribution of earthquakes of different classes by region are given. The total number of earthquakes in 2016–2017 was NΣ=140 in the range KR =4.0–14.4 with depths h=1–160 km and the total seismic energy ΣE=2.92·1014 J. The maximum earthquake with KR=14.4, MSH=5.7 and hрР=95 km was registered on September 23, 2016 located in the Vrancea zone. The earthquake was felt by the population in Romania and Moldova. In the cities of Chisinau and Cahul, the earthquake was felt with intensity I=3–4 points. In the Precarpathian and Transcarpathian regions, all earthquakes are weaker. The strongest event in Transcarpathia was a tangible earthquake, which occurred north of the village of Uglya, Tyachevo district, on June 6, 2017 with KR=9.8, of h=5 km. The earthquake was felt by the population of 20 settlements with an intensity ranging from 2 to 4–5 points. The most powerful event in Precarpathian in 2016–2017 there was a tangible earthquake that occurred in the Drohobych district of the Lvov region on September 29, 2017 with KR=9.8 at a depth of 1.9 ± 0.4 km. Perhaps it was a tectonic earthquake that triggered a collapse in the mine, or vice versa – the collapse of the rocks was recorded as a seismic event. The strongest event in Bukovina was an earthquake that occurred on July 12, 2016 at 18h21m with an energy class of KR=9.9 and magnitude МSH=3.0 in the area of the village of Kurazhin, Khmelnitsky region and was felt by the population with an intensity of 3–4 points. In general, in the seismically active zone of Vrancea and Bukovina in 2016–2017 there was an increase in the level of seismicity compared to those in 2012–2015, and in areas № 1, 3 and 8 there was a slight decrease in the level of seismicity.