TY JOUR TI Coseismic Multiple Cusp Signatures in VIPIR Ionograms from SKiKP-Excited Infrasound following the 2025 MW 8.8 Kamchatka Earthquake KW High altitude acoustic wave KW coseismic ionospheric disturbance KW SKiKP KW ScS KW Multiple Cusp Signature KW VIPIR ionosonde KW 2025 Kamchatka megathrust earthquake JO Russian Journal of Earth Sciences AU Mabie, J.. AU Скоркина, А.А. AU Молокова, А.. AU Bullett, T.. AU Hollahan, S.. PY 2026 IS 26 PB Геофизический центр Российской Академии Наук