TY JOUR TI Deformation Anomalies of 2025 Kamchatka Earthquake KW Tsunamigenic earthquake KW laser strainmeter KW deformation anomaly KW Kamchatka megathrust earthquake JO Russian Journal of Earth Sciences AU Dolgih, G.I. AU Dolgikh, S.G. PY 2026 IS 26 PB Geophysical Center of the Russian Academy of Sciences