TY JOUR TI Source Parameters of Strong Kamchatka Earthquakes in 2025 (MW > 7.0) from Surface Wave Data KW Seismic moment tensor KW finite-fault modeling KW rupture length KW surface waves KW Kamchatka megathrust earthquake JO Russian Journal of Earth Sciences AU Filippova, A.I. AU Fomochkina, A.S. PY 2026 IS 26 PB Geophysical Center of the Russian Academy of Sciences