TY JOUR TI Study of Seismic Activity Between the Mainshock and the First Aftershock of the Kamchatka Earthquake on July 29, 2025 KW Aftershocks KW matched filter KW noise whitening KW International Monitoring System KW International Data Centre KW Kamchatka megathrust earthquake JO Russian Journal of Earth Sciences AU Китов, И.О. AU Санина, И.А. AU Соколова, И.Н. AU Виноградов, Ю.А. PY 2026 IS 26 PB Геофизический центр Российской Академии Наук