earthquake

One of the key problems of seismic monitoring is the identification of earthquakes and signals from technogenic sources detected by a network of seismic stations. In peacetime, technogenic events are mainly associated with industrial mining developments, however, with the beginning of russia's full-scale aggression against sovereign Ukraine, thousands of seismic signals from explosions as a result of missile, aircraft, artillery strikes were registered by the seismological network of the Main Center of Special Monitoring of the State Space Agency of Ukraine.

Purpose. Statistical information for the period from 2016 to 2021 was used to analyze seismic activity. Objective. The aim of the study is to identify the relationship between changes in water level and local seismic activity in the region. Using HPP and Psing filtering, the hypocenters of earthquakes within a radius of 30 km from the seismic station with the NDNU index were selected, and using geographic information technology tools, the hypocenters of earthquakes were compared with the geological structure of the region. Methodology.

The study analyzes the coordinate time series of five permanent International GNSS Service (IGS) stations located in New Zealand. It also considers their annual movement from 2009 to 2018. The raw data in the form of Receiver Independence Exchange (RINEX) files were taken from IGS database and processes by means of online processing service AUSPOS. Using coordinate time series, horizontal and vertical displacement rates were calculated covering the ten-year study period. According to the results, stations located at the North Island of New Zealand revealed an uplift of 31-32 mm/yr.

Purpose. It is well-known that strong earthquakes are typically accompanied by some phenomena which relate to variations of natural electromagnetic fields. Based on the idea about the mechanism of lithosphere–atmosphere–ionosphere coupling we expect to detect some precursors of strong natural earthquakes in electromagnetic data sets recorded by magnetotelluric instruments far enough from epicenters.

The structure of the geoinformation software «Seismicity of Magadan Region» which united 4872 seismic events (with K from 3.4 up to 16.8) occurred in Magadan region and on the surrounding areas from 1735 to 2011. As a result of geoinformation system usage errors in determination of the positions of 9 large earthquakes (К³12,0) on the given territory from 1988 to 1997 were found.

For the first time for Transcarpathian region the solution of the focal mechanism of perceptible earthquake was solved. Earthquake occurred under the influence of the horizontal compression, oriented in latitudinal direction and near-horizontal tension of the submeridional orientation. A first-motion type in the source – strike-slip combined with reverse-oblique.

The space-time properties of the forshock-aftershock successions of earthquakes of Crimea, especially, performance of Omori's and Gutenberg-Richter laws are observed.

In the paper discusses the features of long-term seismicity (1961-2010) the territory of Transcarpathian depression and separate seismoactive zones (A, B and C).  The relationship of these zones with the main tectonic elements of depression is set. It is proved that the boundary between zones A and B passes through Oash deep fault.

Temporal variations of induction vectors in the Transcarpathian active seismic zone were investigated. Analyses of long-term series of magnetic-variation observations let’s to made a conclusion about correlations of Wise vectors variations with seismic processes in the crust and, also, about perspectives of a method’s implementation in detection of local earthquakes precursors (with M>3 magnitude) in the geological-geophysics conditions of the Transcarpathians trough.

The earthquakes monitoring in all world reveals that the “seismogenic” fluctuations of magnetic field in wide frequency band often occur before these seismic events. We believe that the most reliable information is concentrated in ultra low frequency (ULF) band (0.001-3 Hz). The earthquake ULF magnetic precursors of lithospheric origin are very weak as a rule and their frequency range is overlapping with signals of ionospheric origin. The new method of the seismomagnetic signals selection at the background of more powerful magnetic variations of other nature is proposed.