July 10, 2026
Earthquake Research Committee,
Headquarters for Earthquake Research Promotion
* On June 8, an earthquake with a moment magnitude (Mw) of 7.7 occurred in Mindanao, the Philippines. The earthquake triggered a tsunami that was recorded along the Pacific coast from the Kanto region to Okinawa Prefecture, as well as in the Izu and Ogasawara Islands. At Chichijimahutami observation point, a 17 cm tsunami was recorded (provisional results).
* On June 16, a magnitude (M) 5.5 earthquake occurred in southern Ibaraki Prefecture. The quake recorded a maximum seismic intensity 5 Lower in Gunma and Saitama Prefectures. It caused damage and injuries.
* On June 25, an M7.2 earthquake occurred offshore of Iwate Prefecture. It recorded a maximum seismic intensity 6 Upper in Aomori Prefecture. It caused damage and injuries. Furthermore, a long-period ground motion of class 2 was recorded from Hokkaido to the Tohoku region.
The event triggered a tsunami, which recorded 0.1 m (preliminary results) at the Kuji Port observation point (Port and Harbor Bureau) in Iwate Prefecture.
Furthermore, on June 28, an M6.1 earthquake occurred, with a maximum seismic intensity 5 Lower in Aomori and Iwate prefectures.
* On June 26, an M5.6 earthquake occurred in eastern Yamanashi Prefecture and the Fuji Five Lakes. The earthquake recorded a maximum seismic intensity 6 Lower in Yamanashi Prefecture. It caused damage and injuries.
There was no remarkable activity.
* For the information about the M7.2 earthquake offshore of Iwate Prefecture on June 25, please refer to "Evaluation of Earthquake Offshore of Iwate Prefecture on June 25, 2026."
* On June 1, an M6.0 earthquake occurred in the ocean near Torishima Island at a depth of approximately 20 km (based on CMT solutions). Its focal mechanism was a reverse fault type with a pressure axis oriented in the E-W direction.
* On June 16, an M5.5 earthquake occurred in southern Ibaraki Prefecture at a depth of approximately 50 km. Its focal mechanism was a reverse fault type with a pressure axis oriented in the NW-SE direction. The earthquake occurred at the boundary between the Philippine Sea Plate and the continental plate.
GNSS observations revealed no remarkable crustal deformation related to this earthquake.
* On June 26, an M5.8 earthquake occurred in northeastern Chiba Prefecture at a depth of approximately 55 km. Its focal mechanism was a reverse fault type with a pressure axis oriented in the E-W direction. The earthquake occurred at the boundary between the Pacific Plate and the Philippine Sea Plate.
* For the information about the M5.6 earthquake in eastern Yamanashi Prefecture and the Fuji Five Lakes on June 26, please refer to "Evaluation of Earthquake in Eastern Yamanashi Prefecture and the Fuji Five Lakes on June 26, 2026."
There was no remarkable activity.
There was no remarkable activity.
* There have been no unusual changes that would suggest that the likelihood of a great earthquake occurring along the Nankai Trough has increased compared to the normal background level.
* On June 8, an earthquake with a moment magnitude (Mw) of 7.7 occurred in Mindanao, the Philippines. The focal mechanism was a reverse fault type with a pressure axis oriented in the E-W direction. The earthquake triggered a tsunami that was recorded along the Pacific coast from the Kanto region to Okinawa Prefecture, as well as in the Izu Islands and Chichijima Island. At Chichijimahutami observation point, a 17 cm tsunami was recorded (provisional results).
Note: GNSS refers to a generic term for satellite positioning systems, including GPS.
July 10, 2026
Earthquake Research Committee
The numbers of earthquakes by magnitude (M) in and around Japan in June 2026 are as follows.
(Reference)
The following events for the period from June 2025 until the end of May 2026 have been listed as "Major Seismic Activities" in the monthly "Evaluation of Seismic Activities."
| – In the ocean near Tokara Islands | M5.3 on June 30, 2025 | ||
| – In the ocean near Tokara Islands | M5.1 on July 2, 2025 | ||
| – In the ocean near Tokara Islands | M5.6 on July 2, 2025 | ||
| – In the ocean near Tokara Islands | M5.5 on July 3, 2025 (Depth of approximately 10 km) |
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| – In the ocean near Tokara Islands | M5.4 on July 5, 2025 | ||
| – In the ocean near Tokara Islands | M4.9 on July 6, 2025 | ||
| – In the ocean near Tokara Islands | M5.5 on July 6, 2025 | ||
| – In the ocean near Tokara Islands | M5.1 on July 7, 2025 | ||
| – Offshore east of the Kamchatka Peninsula, Russia | M8.8 on July30, 2025 | ||
| – In the ocean near Tokara Islands | M4.7 on September 17, 2025 | ||
| – Offshore southeast of the Nemuro Peninsula | M5.8 on October 25, 2025 (Depth of approximately 40 km) |
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| – Offshore of Sanriku | M6.9 on November 9, 2025 (Depth of approximately 15 km) | ||
| – In Aso region, Kumamoto Prefecture | M5.8 on November 25, 2025 (Depth of approximately 10 km) | ||
| – Offshore east of Aomori Prefecture | M7.5 on December 8, 2025 (Depth of approximately 55 km) | ||
| – In eastern Shimane Prefecture | M6.4 on January 6, 2026 (Depth of approximately 10 km) | ||
| – In southern Ibaraki Prefecture | M5.0 on April 1, 2026 (Depth of approximately 50 km) | ||
| – In northern Nagano Prefecture | M5.0 on April 18, 2026 (Depth of approximately 10 km) | ||
| – In northern Nagano Prefecture | M5.1 on April 18, 2026 (Depth of approximately 10 km) | ||
| – Offshore of Sanriku | M7.7 on April 20, 2026 (Depth of approximately 20 km) | ||
| – In the southern Tokachi region | M6.2 on April 27, 2026 (Depth of approximately 85 km) | ||
| – Offshore of Miyagi Prefecture | M6.4 on May 15, 2026 (Depth of approximately 45 km) | ||
| – In the ocean near Okinawa Main Island | M5.9 on May 20, 2026 (Depth of approximately 50 km) | ||
There is no supplementary information for Hokkaido region.
There is no supplementary information for Tohoku region.
– GNSS observations suggest that crustal deformation in the area stretching from western Shizuoka to eastern Aichi Prefectures differs from the normal trend, a phenomenon that has been observed since early 2022. It is believed that this change is the result of long-term slow slip occurring deep within the boundary between the Philippine Sea Plate and the continental plate, extending from the Atsumi Peninsula to Lake Hamana. The slip center is gradually shifting from the Atsumi Peninsula towards the eastern side of Lake Hamana.
– From June 7 to June 23, deep low-frequency earthquakes (tremor activity) were recorded near the boundary between the Philippine Sea Plate and the continental plate in central Shikoku. Strain and tilt data suggest that the slight crustal deformations recorded in the area were almost synchronized with the deep low-frequency earthquakes (tremors). It is believed that this phenomenon resulted from a short-term slow slip event occurring deep within the boundary between the two plates.
– Since approximately mid-2025, there has been a notable increase in clusters of tremor activity occurring at depths ranging from 5 to 20 km within the Earth's crust in northern Yamaguchi Prefecture. The largest earthquake of this series was an M3.1 event (maximum seismic intensity 1) which occurred on June 16.
Since February 2025, clusters of tremors have been occurring continuously at depths of approximately 25 to 30 km in the lower crust around this area. This series of tremors has been accompanied by slight crustal deformation.
There is no supplementary information for the Kyushu-Okinawa region.
– "There have been no unusual changes that would suggest that
the likelihood of a great earthquake occurring along the Nankai Trough has increased compared to the normal background level.":
(This evaluation corroborates the views presented at the regular meeting of the Nankai Trough Earthquake Assessment Committee on July 7 (reference below).)
(Reference)
Recent Crustal Activity Around the Nankai Trough (Seismological and Volcanological Department, Japan Meteorological Agency, July 7, 2026)
"Currently, there have been no unusual changes that would suggest that the likelihood of a great earthquake occurring along the Nankai Trough has increased compared to the normal background level. (Excerpted)"
Reference 1
Earthquakes that are described in the "Evaluation of Seismic Activity" (Monthly Report of Seismic Activity in Japan) have the following features.
Reference 2
Information that is described in the "Supplementary Information to the Evaluation" includes: