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Japan · Ibaraki Prefecture

M3.9 Earthquake near Shimotsuma, Ibaraki Prefecture (Japan)

UTC time: 2026-09-22 06:34:30 UTC Local time: —
Magnitude
M3.9
Depth
50.0 km
Source
EMSC

Ibaraki Prefecture · Shimotsuma

Country overview

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About this earthquake

A magnitude M3.9 earthquake was recorded near Shimotsuma, Ibaraki Prefecture (Japan) on September 22, 2026 at 06:34 UTC. The hypocenter lay relatively close to the surface at around 50 km, increasing how strongly it was felt. Shaking of this size is frequently noticed but usually harmless.

The event was recorded by EMSC. Japan: over the past 24 hours, QuakeMap24 logged 4 earthquakes, the strongest at M5.1.

Details

ID
4034a7292f20d0ba0d02dde00bb4df9abd4c5489
Magnitude
M3.9
Depth
50.0 km
UTC time
2026-09-22 06:34:30 UTC
Local time
—
Country
Japan
State
Ibaraki Prefecture
City
Shimotsuma
Source
emsc
Coordinates
36.20000, 140.00000
Temperature
30.8°C

Depth profile

Depth profile Depth: 50 km (Shallow) Surface Shallow Intermediate Deep 0 km 70 km 300 km 700 km 50 km
Shallow
50 km
50 km — deeper 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

Volcanoes nearby

  • Nantaisan
    Distance: 78 km ·Stratovolcano ·Elevation: 2'486 m ·Last eruption: -9540 ·Japan
  • Takaharayama
    Distance: 80 km ·Stratovolcano ·Elevation: 1'795 m ·Last eruption: -4570 ·Japan
  • Omanago Group
    Distance: 82 km ·Lava dome(s) ·Elevation: 2'341 m ·Last eruption: -3050 ·Japan
  • Akagisan
    Distance: 83 km ·Stratovolcano ·Elevation: 1'828 m ·Japan
  • Nikko-Shiranesan
    Distance: 87 km ·Shield ·Elevation: 2'578 m ·Last eruption: 1952 ·Japan
  • Nasudake
    Distance: 103 km ·Stratovolcano(es) ·Elevation: 1'915 m ·Last eruption: 1963 ·Japan

Radius · 50 km

Nearby infrastructure

Up to 3 nearest sites per category

Airports

  • Ibaraki AirportJapan · IBR · RJAH
    37.2 kmStraight-line distance

Source: OurAirports · Dataset date: 2026-09-22

This selection shows geographic proximity, not a hazard zone or confirmed impacts. Distances use recorded site coordinates. Sources & data dates

Japan

Context for this earthquake

22 Sep 2025 – 22 Sep 2026 · M ≥ 3.0 · 953 Catalogue entries

Of 952 other entries for this area and period, 296 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

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

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