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Japan · Kumamoto Prefecture

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

UTC time: 2026-08-12 21:21:29 UTC Local time: —
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Archive record · original publication time was not recorded

Automatically generated from measurement data by QuakeMap24. Values may change after further analysis.

Magnitude
M4.6
Depth
10.0 km
Source
USGS

Kumamoto Prefecture · Kamiamakusa

Country overview

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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: 2 earthquakes were recorded in the past 24 hours, the strongest reaching M3.6.

Details

ID
2d6ac3bc8ec9ebb5a3e51ced0b2dd67e877450d1
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

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 (33.7 km)
Regional average: 33.7 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 Activity reported
    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 Activity reported
    Distance: 102 km ·Caldera ·Elevation: 1'117 m ·Last eruption: 2026 ·Japan

Radius · 50 km

Nearby infrastructure

Up to 3 nearest sites per category

Airports

  • Amakusa AirportJapan · AXJ · RJDA
    25.8 kmStraight-line distance

Source: OurAirports · Dataset date: 2026-10-05

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

05 Oct 2025 – 05 Oct 2026 · M ≥ 3.0 · 199 Catalogue entries

Sufficiently reliable matching data are not currently available for a direct comparison. The area profile shows the available records and their limitations.

Open seismic profile

Historic earthquake map · Japan

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Country statistics · Japan

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

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