The 2026 Offshore Sarangani Earthquake: Crustal deformation detected by ALOS-2 and ALOS-4 data

M7.8 (USGS) earthquake occurred in Mindanao Island, Philippines, on June 7, 2026 (UTC). To measure the crustal deformation caused by this earthquake, we applied interferometric analysis using ALOS-2/PALSAR-2 and ALOS-4/PALSAR-3 data. The analysis clearly revealed the spatial distribution of crustal deformation.

• Coseismic crustal deformation was observed in southern Mindanao Island.

Pair	Fig. #	Satellite	Date	Time (UTC)	Flight Dir.	Beam Dir.	Obs. Mode *1	Incidence Angle	Bperp
Pair 1	2	ALOS-2 ALOS-4	2022-06-06 2026-06-09	03:25	Dsc.	Right	F-F (10 m)	32.5°	-3.6m
Pair 2	2	ALOS-2 ALOS-4	2022-03-14 2026-06-09	03:25	Dsc.	Right	F-F (10 m)	36.2°	-121.9m

*1 F: Stripmap (Fine)
(cf. JAXA | ALOS-2 Project, JAXA | ALOS-4 Project)

Analysis by GSI from ALOS-2 and ALOS-4 data of JAXA.
ALOS-2 and ALOS-4 data were provided from the SAR analysis working group for monitoring earthquake activity based on a cooperative research agreement with JAXA.

Date-Time	Jun. 7, 2026, 23:37:41 (UTC)
Hypocenter Location	5.592°N, 125.047°E, Depth: 55.2km (USGS, as of Jun. 9, 2026)
Magnitude	M=7.8 (USGS, as of Jun. 9, 2026)

ALOS-2 (Advanced Land Observing Satellite 2) launched by Japan Aerospace Exploration Agency on May 24, 2014
ALOS-4 (Advanced Land Observing Satellite 4) launched by Japan Aerospace Exploration Agency on July 1, 2024

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