Last Updated : August 1, 2025

The 2025 Kamchatka Peninsula Earthquake: Crustal deformation detected by ALOS-2 data

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Released: Aug. 1, 2025, update: Aug. 6, 2025 Japanese version of this page

Summary

M8.8 (USGS) earthquake occurred in Kamchatka peninsula on July 29, 2025 (UTC). To measure the crustal deformation caused by this earthquake, we applied interferometric analysis using ALOS-2/PALSAR-2 data. The analysis clearly revealed the spatial distribution of crustal deformation.
  • In southern Kamchatka Peninsula, crustal deformation exceeding 1 m in the eastward direction was observed.

InSAR pair

Pair Fig.
#		 Date Time
(UTC)		 Flight
Dir.		 Beam
Dir.		 Obs.
Mode *1		 Incidence Angle
(around epicenter)		 Bperp
Pair1 4-5 2023-09-13
2025-07-30		 13:20 Asc. Right W-W
(350km)		 37.3° -135.6m
Pair2 6-7 2024-09-14
2025-08-02		 1:40 Des. Right W-W
(350km)		 34.9° 25.9m

*1 W:ScanSAR(Wide)
(cf. ALOS-2 Project / PALSAR-2 (JAXA))

2.5-Dimensional analysis

2.5次元解析結果（準上下成分）

Fig. 1 Quasi-up-down Displacement
from the combination of Pair1 and Pair2 [PNG: 1.3MB]
Epicenter is from USGS.

2.5次元解析結果（準東西成分）

Fig. 2 Quasi-east-west Displacement
from the combination of Pair1 and Pair2 [PNG: 1.2MB]
Epicenter is from USGS.

SAR Interferograms

SAR撮像領域0805

Fig. 3 SAR footprint[PNG: 1.3MB]

SAR干渉画像結果（pair1）0805

Fig. 4 SAR interferogram (Pair 1: 2023-09-13_2025-07-30) [PNG: 1.6MB]
Epicenter is from USGS.

SAR干渉画像結果（アンラップP1）0805

Fig. 5 SAR interferogram (Unwrapped) (Pair 1: 2023-09-13_2025-07-30) [PNG: 1.1MB]
Epicenter is from USGS.

SAR干渉画像結果（pair2）0805

Fig. 6 SAR interferogram (Pair 2: 2024-09-14_2025-08-02) [PNG: 2.6MB]
Epicenter is from USGS.

SAR干渉画像結果（アンラップP2）0805

Fig. 7 SAR interferogram (Unwrapped) (Pair 2: 2024-09-14_2025-08-02) [PNG: 1.6MB]
Epicenter is from USGS.

Analysis by GSI from ALOS-2 data of JAXA.
ALOS-2 data were provided from the SAR analysis working group for monitoring earthquake activity based on a cooperative research agreement with JAXA.

The 2025 Kamchatka Peninsula Earthquake

Date-Time Jul. 29, 2025, 23:24:52(UTC)
Hypocenter
Location		 52.512°N, 160.324°E, Depth:35.0km
(USGS, as of Aug. 5, 2025)
Magnitude M=8.8
(USGS, as of Aug. 5, 2025)

Satellite

ALOS-2 (Advanced Land Observing Satellite 2) launched by Japan Aerospace Exploration Agency on May 24, 2014

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Contact

Geography and Crustal Dynamics Research Center
Crustal Deformation Research
MUNEKANE Hiroshi: Head of Division
Contact

Links

[Reference information] Analysis results on August 1, 2025

Summary

M8.8 (USGS) earthquake occurred in Kamchatka peninsula on July 29, 2025 (UTC). To measure the crustal deformation caused by this earthquake, we applied interferometric analysis using ALOS-2/PALSAR-2 data. The analysis clearly revealed the spatial distribution of crustal deformation.
  • In southern Kamchatka peninsula, crustal deformation reaching 1 m in the direction of away from satellite was observed.

SAR Interferograms

SAR撮像領域

Fig. 1 SAR footprint[PNG: 1.3MB]

SAR干渉画像結果（pair1）

Fig. 2 SAR interferogram (Pair 1: 2023-09-13_2025-07-30) [PNG: 2.5MB]
Epicenter is from USGS.

SAR干渉画像結果（アンラップP1）

Fig. 3 SAR interferogram (Unwrapped) (Pair 1: 2023-09-13_2025-07-30) [PNG: 1.6MB]
Epicenter is from USGS.

InSAR pair and the 2025 Kamchatka Peninsula Earthquake

Pair Fig.
#		 Date Time
(UTC)		 Flight
Dir.		 Beam
Dir.		 Obs.
Mode *1		 Incidence Angle
(around epicenter)		 Bperp
Pair1 2-3 2023-09-13
2025-07-30		 13:20 Asc. Right W-W
(350km)		 37.3° -135.6m

*1 W:ScanSAR(Wide)
(cf. ALOS-2 Project / PALSAR-2 (JAXA))

Date-Time Jul. 29, 2025, 23:24:52(UTC)
Hypocenter
Location		 52.512°N, 160.324°E, Depth:35.0km
(USGS, as of Aug. 1, 2025)
Magnitude M=8.8
(USGS, as of Aug. 1, 2025)

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