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M4.9 Depth: 10.0 km

M4.9 Earthquake near Kamiamakusa, Kumamoto Prefecture (Japan)

UTC time: 2026-08-12 04:05:52 UTC Local time: —

About this earthquake

On August 12, 2026 at 04:05 UTC, a magnitude M4.9 earthquake occurred near Kamiamakusa, Kumamoto Prefecture (Japan). With a focal depth of about 10 km, this was a shallow earthquake, whose shaking is usually felt more strongly at the surface. Earthquakes of this magnitude are clearly felt; minor damage to vulnerable buildings is possible.

The event was recorded by USGS. Japan: 6 earthquakes were recorded in the past 24 hours, the strongest reaching M5.0.

Details

Magnitude
M4.9
Depth
10.0 km
UTC time
2026-08-12 04:05:52 UTC
Local time
—
Country
Japan
State
Kumamoto Prefecture
City
Kamiamakusa
Source
usgs
Coordinates
32.45640, 130.45040
Temperature
29.3°C

Map

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 (32.2 km)
Regional average: 32.2 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

Estimated impact

2 Felt reports · max reported intensity 4.1

Tectonic context

Located on the Amur Plate.
Near the boundary Amur ↔ Okinawa · about 50 km away

Volcanoes nearby

  • Unzendake
    Distance: 37 km ·Complex ·Elevation: 1'483 m ·Last eruption: 1996 ·Japan
  • Kirishimayama
    Distance: 70 km ·Shield ·Elevation: 1'700 m ·Last eruption: 2025 ·Japan
  • Asosan
    Distance: 76 km ·Caldera ·Elevation: 1'592 m ·Last eruption: 2021 ·Japan
  • Yonemaru-Sumiyoshiike
    Distance: 77 km ·Maar(s) ·Elevation: 40 m ·Last eruption: -6200 ·Japan
  • Aira
    Distance: 100 km ·Caldera ·Elevation: 1'117 m ·Last eruption: 2026 ·Japan
  • Kujusan
    Distance: 102 km ·Stratovolcano(es) ·Elevation: 1'791 m ·Last eruption: 1996 ·Japan

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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