Last Updated : January 16, 2025

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

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Released: Jan. 16, 2025 Japanese version of this page

Summary

M7.1 (USGS) earthquake occurred in Tibet on January 7, 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.
  • Over 1m displacement was observed.

InSAR pair

Pair Fig.
#		 Date Time
(UTC)		 Flight
Dir.		 Beam
Dir.		 Obs.
Mode *1		 Incidence Angle
(around epicenter)		 Bperp
Pair1 2-5 2024-10-15
2025-01-07		 06:06 Des. Right F-F
(10m)		 36.2° +211.0m
Pair2 6-7 2024-12-29
2025-01-12		 06:13 Des. Right W-W
(350km)		 34.9° +53.1m

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

SAR Interferograms

解析範囲

Fig. 1 range

INSAR画像

Fig. 2 SAR interferogram (Pair 1: 2024-10-15_2025-01-07) [PNG: 931KB]
Epicenter is from USGS. Fault lines are based on Styron et al. (2020).

INSAR画像

Fig. 3 SAR interferogram(Unwrapped) (Pair 1: 2024-10-15_2025-01-07) [PNG: 654KB]
Epicenter is from USGS. Fault lines are based on Styron et al. (2020).

INSAR画像

Fig. 4 Result of pixel offset tracking(Beam Direction). (Pair 1: 2024-10-15_2025-01-07) [PNG: 873KB]
Epicenter is from USGS. Fault lines are based on Styron et al. (2020).

INSAR画像

Fig. 5 Result of pixel offset tracking(Flight Direction). (Pair 1: 2024-10-15_2025-01-07) [PNG: 873KB]
Epicenter is from USGS. Fault lines are based on Styron et al. (2020).

INSAR画像

Fig. 6 SAR interferogram (Pair 2: 2024-12-29_2025-01-12) [PNG: 1MB]
Epicenter is from USGS. Fault lines are based on Styron et al. (2020).

INSAR画像

Fig. 7 SAR interferogram(Unwrapped) (Pair 2: 2024-12-29_2025-01-12) [PNG: 743KB]
Epicenter is from USGS. Fault lines are based on Styron et al. (2020).

Analysis by GSI from ALOS-2 data of JAXA.
These results were obtained through the activity of the SAR analysis working group of the Coordinating Committee for Earthquake Prediction.

The 2025 Tibet Earthquake

Date-Time Jan. 7, 2025, 1:05(UTC)
Hypocenter
Location		 28.639°N, 87.361°E, Depth:10.0km
(USGS, as of Jan. 16, 2025)
Magnitude M=7.1
(USGS, as of Jan. 16, 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
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