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Japan · Kumamoto Prefecture

M3.3 Earthquake near Kosa, Kumamoto Prefecture (Japan)

UTC time: 2026-07-28 13:23:30 UTC Local time: —

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About this earthquake

On July 28, 2026 at 13:23 UTC, a magnitude M3.3 earthquake occurred near Kosa, Kumamoto Prefecture (Japan). The hypocenter lay relatively close to the surface at around 10 km, increasing how strongly it was felt. Earthquakes of this magnitude are often felt but rarely cause damage.

The data is provided by EMSC and cross-checked across seismological networks. Japan: 3 earthquakes were recorded in the past 24 hours, the strongest reaching M5.1.

Details

ID
ef578bb02b66a4cca6c17dfef524f739fc78e670
Magnitude
M3.3
Depth
10.0 km
UTC time
2026-07-28 13:23:30 UTC
Local time
—
Country
Japan
State
Kumamoto Prefecture
City
Kosa
County
Kamimashiki County
Source
emsc
Coordinates
32.70000, 130.80000
Temperature
19.0°C

Depth profile

Depth profile Depth: 10 km (Shallow) Surface Shallow Intermediate Deep 0 km 70 km 300 km 700 km 10 km
Shallow
10 km
10 km — shallower than the regional average (33.1 km)
Regional average: 33.1 km
Why depth matters

Shallow quakes release energy near the surface — shaking is felt more strongly and damage potential is higher.

Depth classes per USGS

Volcanoes nearby

  • Asosan Activity reported
    Distance: 34 km ·Caldera ·Elevation: 1'592 m ·Last eruption: 2021 ·Japan
  • Unzendake
    Distance: 47 km ·Complex ·Elevation: 1'483 m ·Last eruption: 1996 ·Japan
  • Kujusan
    Distance: 60 km ·Stratovolcano(es) ·Elevation: 1'791 m ·Last eruption: 1996 ·Japan
  • Yufu-Tsurumi
    Distance: 85 km ·Lava dome(s) ·Last eruption: 867 ·Japan
  • Kirishimayama
    Distance: 85 km ·Shield ·Elevation: 1'700 m ·Last eruption: 2025 ·Japan
  • Yonemaru-Sumiyoshiike
    Distance: 105 km ·Maar(s) ·Elevation: 40 m ·Last eruption: -6200 ·Japan

Radius · 50 km

Nearby infrastructure

Up to 3 nearest sites per category

Airports

  • Kumamoto AirportJapan · KMJ · RJFT
    16.1 kmStraight-line distance

Source: OurAirports · Dataset date: 2026-09-21

This selection shows geographic proximity, not a hazard zone or confirmed impacts. Distances use recorded site coordinates. Sources & data dates

Kumamoto Prefecture

Context for this earthquake

21 Sep 2025 – 21 Sep 2026 · M ≥ 3.0 · 190 Catalogue entries

Of 189 other entries for this area and period, 91 have a higher stored magnitude. Different magnitude types and reports not yet merged limit the comparison.

Open seismic profile

Historic earthquake map · Japan

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Explore recent and long-term earthquake activity in this country. Use filters to narrow down by magnitude, depth, and date range.

Country statistics · Japan

Country overview
View earthquake KPIs, strongest and latest events, and averages for this country.

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