Study of the process of preparation of strong earthquakes ($M_w \geq 5$) on Sakhalin using the LURR method

the seismic regime of southern Sakhalin before the Krillon earthquake on April 23, 2017 ($M_w=5.0$) was Investigated. Seismic hazard calculations were carried out within the framework of the LURR (load-unload response ratio) method. According to the catalog of the local network of field stations, the precursor of earthquake preparation at the end of 2015 was determined. The process of relaxation in the focal zone was studied according to the data of aftershock activity during 2017.