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Japan · Saitama Prefecture

M4.9 Earthquake near Satte, Saitama Prefecture (Japan)

UTC time: 2026-09-28 19:45:08 UTC Local time: —
Earthquake newsQuakeMap24
First published: Content updated:

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

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About this earthquake

On September 28, 2026 at 19:45 UTC, a magnitude M4.9 earthquake occurred near Satte, Saitama Prefecture (Japan). At around 71 km, the focal depth places this among intermediate-depth events. Earthquakes of this magnitude are clearly felt; minor damage to vulnerable buildings is possible.

The event was recorded by USGS. Japan: over the past 24 hours, QuakeMap24 logged 2 earthquakes, the strongest at M3.9.

Details

ID
4b2accf58562e0909e7b9760f7227d73f60a48be
Magnitude
M4.9
Depth
71.0 km
UTC time
2026-09-28 19:45:08 UTC
Local time
—
Country
Japan
State
Saitama Prefecture
City
Satte
Source
usgs
Coordinates
36.08090, 139.77820
Temperature
20.5°C

Depth profile

Depth profile Depth: 71 km (Intermediate) Surface Shallow Intermediate Deep 0 km 70 km 300 km 700 km 71 km
Intermediate
71 km
71 km — deeper than the regional average (33.2 km)
Regional average: 33.2 km
Why depth matters

Intermediate-depth quakes are felt across a wider area but usually cause less surface damage.

Depth classes per USGS

Felt reports

66felt reports at EMSC / LastQuake

Voluntary reports of feeling this earthquake. The count is not an intensity measurement and is not added to USGS DYFI reports.

Data updated: Oct 1, 2026, 12:29 PM UTC · Last checked: Oct 4, 2026, 8:52 PM UTC

Source: EMSC / LastQuake

Estimated impact

69 Felt reports · max reported intensity 4.3

Tectonic context

Located on the Okhotsk Plate.
Near the boundary Okhotsk ↔ Philippine Sea · about 128 km away

Volcanoes nearby

  • Akagisan
    Distance: 75 km ·Stratovolcano ·Elevation: 1'828 m ·Japan
  • Nantaisan
    Distance: 80 km ·Stratovolcano ·Elevation: 2'486 m ·Last eruption: -9540 ·Japan
  • Omanago Group
    Distance: 85 km ·Lava dome(s) ·Elevation: 2'341 m ·Last eruption: -3050 ·Japan
  • Nikko-Shiranesan
    Distance: 88 km ·Shield ·Elevation: 2'578 m ·Last eruption: 1952 ·Japan
  • Takaharayama
    Distance: 91 km ·Stratovolcano ·Elevation: 1'795 m ·Last eruption: -4570 ·Japan
  • Harunasan
    Distance: 94 km ·Stratovolcano ·Elevation: 1'449 m ·Last eruption: 550 ·Japan

Japan

Context for this earthquake

04 Oct 2025 – 04 Oct 2026 · M ≥ 3.0 · 969 Catalogue entries

Of 968 other entries for this area and period, 87 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

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

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