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M3.9 Depth: 30.0 km

M3.9 Earthquake near Miyakojima, Okinawa Prefecture (Japan)

UTC time: 2026-08-20 18:15:30 UTC Local time: —

About this earthquake

On August 20, 2026 at 18:15 UTC, a magnitude M3.9 earthquake occurred near Miyakojima, Okinawa Prefecture (Japan). With a focal depth of about 30 km, this was a shallow earthquake, whose shaking is usually felt more strongly at the surface. Shaking of this size is frequently noticed but usually harmless.

The data is provided by EMSC and cross-checked across seismological networks. Japan: 3 earthquakes were recorded in the past 24 hours, the strongest reaching M5.8.

Details

Magnitude
M3.9
Depth
30.0 km
UTC time
2026-08-20 18:15:30 UTC
Local time
—
Country
Japan
State
Okinawa Prefecture
City
Miyakojima
Source
emsc
Coordinates
24.70000, 125.00000
Temperature
28.6°C

Map

Depth profile

Depth profile Depth: 30 km (Shallow) Surface Shallow Intermediate Deep 0 km 70 km 300 km 700 km 30 km
Shallow
30 km
30 km — close to the regional average (32.8 km)
Regional average: 32.8 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

  • Submarine Volcano NNE of Iriomotejima
    Distance: 109 km ·Stratovolcano ·Elevation: -200 m ·Last eruption: 1924 ·Japan
  • Kueishantao
    Distance: 308 km ·Stratovolcano ·Elevation: 361 m ·Last eruption: 1853 ·Taiwan
  • Tatun Volcanic Group
    Distance: 352 km ·Lava dome(s) ·Elevation: 1'120 m ·Last eruption: 648 ·Taiwan
  • Io-Torishima
    Distance: 478 km ·Complex ·Elevation: 212 m ·Last eruption: 1968 ·Japan

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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