Kazan, Kazan, Russian Federation
Russian Federation
Russian Federation
Russian Federation
Russian Federation
Russian Federation
Russian Federation
UDC 52
UDC 528
UDC 528.06
UDC 55
UDC 550.34
UDC 550.383
CSCSTI 37.01
CSCSTI 37.15
CSCSTI 37.25
CSCSTI 37.31
CSCSTI 38.01
CSCSTI 36.00
CSCSTI 37.00
CSCSTI 38.00
CSCSTI 39.00
CSCSTI 52.00
Russian Classification of Professions by Education 05.00.00
Russian Library and Bibliographic Classification 26
Russian Trade and Bibliographic Classification 63
BISAC SCI SCIENCE
This study analyzes crustal movements and ionospheric response triggered by the powerful MW 8.8 earthquake of July 29, 2025, using continuous GNSS observations from open geodetic network stations located on the Kamchatka Peninsula, Sakhalin Island, the coast of the Sea of Okhotsk, and the Kuril Islands. Significant coseismic horizontal and vertical coordinate changes were detected at GNSS stations on the Kamchatka Peninsula near Petropavlovsk-Kamchatsky (up to 65 cm horizontally and 8 cm vertically), in Severo-Kurilsk city (168 cm horizontally and 19 cm vertically), and on Sakhalin Island (up to 3 cm horizontally). The time delay of surface deformation propagation was estimated for stations in Petropavlovsk-Kamchatsky and Severo-Kurilsk. The ionospheric response to the earthquake was investigated, revealing concentric ionospheric disturbances propagating southwestward from the earthquake epicenter. Two modes of this disturbance were identified: a fast mode with a propagation velocity of 800–1300 m/s detectable during the first ~20 minutes, and a slow mode with velocity of 180–330 m/s observed approximately 40 minutes after the main shock.
Aftershock displacements, surface movements, Precise Point Positioning (PPP), InnoGNSS, Total Electron Content (TEC), Kamchatka megathrust earthquake
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