Revealing Paleoseismic Dislocations in the St. Petersburg Region Based on Remote Sensing Data
The intensity of paleoearthquakes in the territory was estimated by two methods: maximum displacement of Quaternary rocks by ruptures and by the parameters of clastic dikes of seismogenic genesis. Based on the use of archival materials from space surveys and Google Earth images, a method for searching for paleoseismic dislocations is substantiated. Searches for seismic manifestations within the Yukka-Toksovskaya fault zone were carried out. 40 seismogenic scarps were discovered, some of them were opened by ditches. The study of the scarps makes it possible to estimate the strength of the earthquakes of the late and middle Holocene in this area, respectively, at 7.2 and 6.8 magnitudes. The deep structure of the area of concentration of paleoseismic dislocations has been studied by the method of spectral-seismic profiling.