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Japan · Kumamoto Prefecture

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

UTC time: 2026-08-01 16:07:22 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

On August 1, 2026 at 16:07 UTC, a magnitude M4.6 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. 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: 3 earthquakes were recorded in the past 24 hours, the strongest reaching M5.1.

Details

ID
b036c0959a8b14faffb3831b5d3a08f3c4ce247d
Magnitude
M4.6
Depth
10.0 km
UTC time
2026-08-01 16:07:22 UTC
Local time
—
Country
Japan
State
Kumamoto Prefecture
City
Kamiamakusa
Source
usgs
Coordinates
32.44880, 130.45990
Temperature
28.7°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

Estimated impact

1 Felt reports · max reported intensity 2.7

Tectonic context

Located on the Amur Plate.
Near the boundary Amur ↔ Okinawa · about 49 km away

Volcanoes nearby

  • Unzendake
    Distance: 38 km ·Complex ·Elevation: 1'483 m ·Last eruption: 1996 ·Japan
  • Kirishimayama
    Distance: 69 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: 76 km ·Maar(s) ·Elevation: 40 m ·Last eruption: -6200 ·Japan
  • Aira Activity reported
    Distance: 99 km ·Caldera ·Elevation: 1'117 m ·Last eruption: 2026 ·Japan
  • Kujusan
    Distance: 102 km ·Stratovolcano(es) ·Elevation: 1'791 m ·Last eruption: 1996 ·Japan

Radius · 50 km

Nearby infrastructure

Up to 3 nearest sites per category

Airports

  • Amakusa AirportJapan · AXJ · RJDA
    28.5 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, 9 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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Country statistics · Japan

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

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