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M4.6 Depth: 10.0 km

M4.6 Earthquake near Kamiamakusa, Kumamoto Prefecture (Japan)

UTC time: 2026-08-12 21:21:29 UTC Local time: —

About this earthquake

A magnitude M4.6 earthquake was recorded near Kamiamakusa, Kumamoto Prefecture (Japan) on August 12, 2026 at 21:21 UTC. The hypocenter lay relatively close to the surface at around 10 km, increasing how strongly it was felt. Tremors of this size are distinctly felt and can occasionally cause light damage.

The data is provided by USGS and cross-checked across seismological networks. Japan: 6 earthquakes were recorded in the past 24 hours, the strongest reaching M5.0.

Details

Magnitude
M4.6
Depth
10.0 km
UTC time
2026-08-12 21:21:29 UTC
Local time
—
Country
Japan
State
Kumamoto Prefecture
City
Kamiamakusa
Source
usgs
Coordinates
32.47650, 130.43430
Temperature
27.1°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

Tectonic context

Located on the Amur Plate.
Near the boundary Amur ↔ Okinawa · about 52 km away

Volcanoes nearby

  • Unzendake
    Distance: 34 km ·Complex ·Elevation: 1'483 m ·Last eruption: 1996 ·Japan
  • Kirishimayama
    Distance: 73 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: 80 km ·Maar(s) ·Elevation: 40 m ·Last eruption: -6200 ·Japan
  • Kujusan
    Distance: 102 km ·Stratovolcano(es) ·Elevation: 1'791 m ·Last eruption: 1996 ·Japan
  • Aira
    Distance: 102 km ·Caldera ·Elevation: 1'117 m ·Last eruption: 2026 ·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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