PROCESS MONITORING RELATION OF BRITTLE AND DUCTILE TYPES OF FRACTURE IN FOCUSES OF EARTHQUAKES IN SEISMICALLY ACTIVE VOLUMES OF ROCKS

摘要

FIELD: geodynamics, seismology. SUBSTANCE: degree of integral rigidity of seismically active masses is determined by domination of brittle or ductile types of seismogenic cracking in them. Types of cracking are diagnosed by steepness of front of first arrivals of longitudinal waves emitted by weak ( background ) earthquakes. Ratio of number of stations which determined parameters of first arrival to number of stations which isolated longitudinal wave is established per each earthquake. Average value of parameter RG found for aggregate of focuses distributed in rock mass characterizes degree of integral rigidity of rock mass for chosen time interval. Using sliding time interval for analysis one gets possibility to monitor deformation state. EFFECT: possibility to monitor changes of properties of seismically active rock mass to study processes of deformation and fracture. 3 dwg