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Methodological aspects of the study of seismic sequences by SDP (self-developing processes) on the example of the Nevel’sk earthquake on Sakhalin

The peculiar features of the application of the SDP (self-developing processes) method of foreshock sequences analysis for the Sakhalin region have been discussed. On the example of the Nevel’sk earthquake (2007, M = 6.2), the characteristics of activations prior to the main shock have been estimated. Calculations were made for the catalogue of weak earthquakes with magnitudes M ≤ 3 and for the complete catalogue of seismic events without limitations on magnitude. Weak events samplings have manifested their advantage. The declustering exerted influence on the results reducing the relaxation effect in the source sites of the earthquakes occurred before the Nevel’sk. The relationship has been established between the SDP sequences progressing in the focal area and the appearance of the LURR (load-unload response ratio) parameter anomaly. A number of indicators have been obtained, which allow the place and time allocation (up to few weeks accuracy) of waiting main event.