Variations of Background Seismic Noise Before Strong Earthquakes, Kamchatka.

Viktoriia Kasimova, KB Geophysical Survey RAS, Petropavlovsk-Kamcha, Russia, Galina Kopylova, KB Geophysical Service RAS, Petropavlovsk-Kamchatsky, Russia and Alexey Lyubushin, Inst. Phys. of the Earth, Moscow, Russia