M7.4 Earthquake 102 km ENE of Miyako, Japan — April 20, 2026
2026-04-20 07:52:58 UTC (2026-04-20) · approx. 5:52 PM UTC+10 local
Felt by 136 people across surrounding communities. Maximum shaking intensity MMI 6.0 (strong).
On April 20, 2026 at 07:52 UTC, a magnitude 7.4 shallow crustal earthquake struck 102 km ENE of Miyako, Japan, at a depth of 25.0 km and coordinates 39.9710°, 143.0592°. The earthquake was reported felt by 136 peopleacross surrounding communities, with a maximum shaking intensity of Modified Mercalli Intensity (MMI) 6.0 (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 239 seismic stations with excellent location accuracy and was assigned a USGS significance rating of 932, making it one of the more significant events of the week. The nearest populated place is Tohoku (population 16,449).
Physical scale: An earthquake of magnitude 7.4 releases seismic energy equivalent to roughly 1.9 megatons of TNT. Empirical fault-scaling laws (Wells & Coppersmith, 1994) estimate the subsurface rupture length at approximately 77 km — a useful intuition for the size of the slip patch on the fault.
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
What the Shaking Felt Like
At MMI 6.0 (strong), people in the most strongly affected areas would have experienced: Moderate shaking that everyone in the area would feel. Sleeping people are awakened. Dishes and windows may break. Unstable objects may be knocked over.
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 136 citizen responses 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 | 5,708 |
| MMI 4 | light | 3,518,262 |
| MMI 5 | moderate | 3,330,676 |
| MMI 6 | strong | 62,206 |
Earthquake Details
143.0592°E
Technical Information
Nearby Earthquakes (Last 7 Days)
Common Questions
How strong was the magnitude 7.4 earthquake near Miyako, Japan?
The magnitude 7.4 earthquake that struck 102 km ENE of Miyako, Japan on April 20, 2026 at 07:52 UTC had a depth of 25.0 km. It was felt by 136 people with maximum shaking intensity of MMI 6.0 (strong). For context, this was a strong earthquake capable of causing significant damage.
Where did the earthquake occur?
The earthquake epicenter was located at 39.9710°, 143.0592°, which is 102 km ENE of Miyako, Japan. The nearest populated place is Tohoku (population 16,449). View all earthquakes in Japan.
Were there aftershocks?
Aftershock activity is monitored continuously by the USGS. Aftershock sequences from magnitude 7.4 earthquakes can continue for months to years and gradually diminish over time.
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 7.4 event is significantly smaller than that historical record.
What should I do after an earthquake?
If you were in the affected area: check yourself and others for injuries, inspect your home for damage, and be prepared for aftershocks. For detailed guidance, see our earthquake safety guide and emergency planning resources.
Authoritative source: USGS event page (event ID: us6000sri7). All scientific values on this page are sourced verbatim from the USGS feed.
Cite this page: EarthquakeTracker.org. (2026, April 20, 2026). M7.4 Earthquake 102 km ENE of Miyako, Japan — April 20, 2026. Retrieved July 3, 2026 from https://www.earthquaketracker.org/earthquakes/event/us6000sri7/