M5.6 Earthquake 16 km NE of Tsunagi, Japan — July 28, 2026
2026-07-28 08:08:35 UTC (1 hour ago) · approx. 5:08 PM UTC+9 local
Felt by 1 person across nearby locations. Maximum shaking intensity MMI 6.2 (very strong). Aftershock of the M6.8 mainshock.
On July 28, 2026 at 08:08 UTC, a magnitude 5.6 shallow crustal earthquake struck 16 km NE of Tsunagi, Japan, at a depth of 10.0 km and coordinates 32.3529°, 130.5868°. The earthquake was reported felt by 1 personacross nearby locations, with a maximum shaking intensity of Modified Mercalli Intensity (MMI) 6.2 (very strong). The USGS PAGER system issued a green alert level for this event, indicating no significant casualties or damage expected. This earthquake was detected by 71 seismic stations with excellent location accuracy and was assigned a USGS significance rating of 483, placing it among routine seismic activity. The nearest populated place is Honmachi (population 122,134).
Physical scale: An earthquake of magnitude 5.6 releases seismic energy equivalent to roughly 4 kilotons of TNT. Empirical fault-scaling laws (Wells & Coppersmith, 1994) estimate the subsurface rupture length at approximately 4.4 km — a useful intuition for the size of the slip patch on the fault.
This earthquake is part of an ongoing aftershock sequence following the magnitude 6.8 mainshock that occurred 2 hours ago 5 km E of Uto, Japan. Since the mainshock, the USGS has recorded 0 aftershocks in this area. Aftershock activity is expected to continue for weeks to months as stresses on surrounding faults redistribute.
The epicenter is located in Japan, a region characterized by the intersection of four tectonic plates — Pacific, Philippine Sea, Eurasian, and North American — creating multiple subduction zones. The nearest mapped fault system is the Japan Trench. View all earthquakes in Japan.
Learn more: Magnitude scale · Aftershock sequences
Nearest Populated Places
ShakeMap — predicted shaking intensity
Modeled ground-motion intensity contoured on the Modified Mercalli scale (MMI). Computed by the USGS from the moment-tensor solution and regional ground-motion prediction equations.
Source: U.S. Geological Survey ShakeMap. View interactive ShakeMap on USGS
Did You Feel It? — community-reported shaking
Aggregated felt-report intensity from 1 citizen response to the USGS Did You Feel It? system. Each colored zone represents the average MMI from reports in that area.
Source: U.S. Geological Survey Did You Feel It?. View on USGS · submit your own report
Population exposure (USGS PAGER)
Estimated population that experienced each level of shaking. Based on the USGS PAGER rapid impact assessment, which combines ShakeMap output with global population grids.
| Shaking intensity (MMI) | Description | Population exposed |
|---|---|---|
| MMI 3 | weak | 7,430,863 |
| MMI 4 | light | 5,673,938 |
| MMI 5 | moderate | 281,843 |
| MMI 6 | strong | 78,373 |
Earthquake Details
130.5868°E
Technical Information
Nearby Earthquakes (Last 7 Days)
Common Questions
How strong was the magnitude 5.6 earthquake near Tsunagi, Japan?
The magnitude 5.6 earthquake that struck 16 km NE of Tsunagi, Japan on July 28, 2026 at 08:08 UTC had a depth of 10.0 km. It was felt by 1 person with maximum shaking intensity of MMI 6.2 (very strong). For context, this was a moderate earthquake that could be widely felt.
Where did the earthquake occur?
The earthquake epicenter was located at 32.3529°, 130.5868°, which is 16 km NE of Tsunagi, Japan. The nearest populated place is Honmachi (population 122,134). View all earthquakes in Japan.
Were there aftershocks?
Aftershock activity is monitored continuously by the USGS. Aftershock sequences from magnitude 5.6 earthquakes can continue for days to weeks and gradually diminish over time.
Is this the same earthquake as the M6.8 one earlier?
No. This magnitude 5.6 earthquake is an aftershock of the larger magnitude 6.8 mainshock that occurred earlier 5 km E of Uto, Japan. Aftershocks are smaller earthquakes triggered by stress changes from the mainshock.
Has Japan had earthquakes this big before?
The largest recorded earthquake in Japan was the M9.1 Tohoku earthquake of March 11, 2011. Today's magnitude 5.6 event is significantly smaller than that historical record.
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Location
Authoritative source: USGS event page (event ID: us6000tgbm). All scientific values on this page are sourced verbatim from the USGS feed.
Cite this page: EarthquakeTracker.org. (2026, July 28, 2026). M5.6 Earthquake 16 km NE of Tsunagi, Japan — July 28, 2026. Retrieved July 28, 2026 from https://www.earthquaketracker.org/earthquakes/event/us6000tgbm/