TY JOUR TI Kamchatka Megaearthquake on July 29, 2025: Reflection of the Preparation Process in the Results of Multi-Instrumental Geophysical Measurements in the Avacha Bay Area KW Seismic hazard prediction KW active earthquake preparation phase KW consolidation model KW borehole measurements KW underground electric antenna KW Kamchatka megaearthquake JO Russian Journal of Earth Sciences AU Гаврилов, В.А. AU Полтавцева, Е.В. AU Бусс, Ю.Ю. AU Морозова, Ю.В. AU Сагаряров, И.А. PY 2026 IS 26 PB Геофизический центр Российской Академии Наук