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M5.5 Earthquake

UTC time: 2025-08-21 22:34:46 UTC Local time: —
Earthquake newsQuakeMap24
Archive record · original publication time was not recorded

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

Magnitude
M5.5
Depth
50.0 km
Source
NNSN

Earthquake location (38.709, 142.088)

Map

M5.5 Earthquake · 2025-08-21 — Map showing the location of the epicenter
M5.5 Earthquake · 2025-08-21 — Map showing the location of the epicenter

About this earthquake

On August 21, 2025 at 22:34 UTC, a magnitude M5.5 earthquake occurred near Earthquake location (38.709, 142.088). The hypocenter lay relatively close to the surface at around 50 km, increasing how strongly it was felt. Events of this size can cause damage near the epicenter.

The data is provided by NNSN and cross-checked across seismological networks.

Details

ID
1df04385366589a5c1c228b6974a4aab5f79762d
Magnitude
M5.5
Depth
50.0 km
UTC time
2025-08-21 22:34:46 UTC
Local time
—
Country
—
Source
nnsn
Coordinates
38.70900, 142.08800

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
Why depth matters

Shallow quakes release energy near the surface — shaking is felt more strongly and damage potential is higher.

Depth classes per USGS

Nearby population centers

Distances are straight-line distances from the epicenter. Population data: GeoNames.

PlaceDistanceDirectionPopulation
Kesennuma49.1 kmNW61'147
Ishinomaki75.8 kmSW140'151
Sendai117.1 kmSW1'096'704

GeoNames · CC BY 4.0

Volcanoes nearby

  • Kurikomayama
    Distance: 116 km ·Stratovolcano ·Last eruption: 1950 ·Japan
  • Naruko
    Distance: 117 km ·Caldera ·Elevation: 470 m ·Last eruption: 837 ·Japan
  • Zaozan [Zaosan]
    Distance: 157 km ·Complex ·Elevation: 1'841 m ·Last eruption: 1940 ·Japan
  • Iwatesan Activity reported
    Distance: 158 km ·Complex ·Elevation: 2'038 m ·Last eruption: 1919 ·Japan
  • Akita-Komagatake
    Distance: 161 km ·Stratovolcano(es) ·Elevation: 1'637 m ·Last eruption: 1971 ·Japan
  • Hijiori
    Distance: 168 km ·Caldera ·Elevation: 552 m ·Japan

Radius · 100 km

Nearby infrastructure

Up to 3 nearest sites per category

Nuclear power plants

  • Onagawa nuclear power plantJapanOut of operation · Operating at dataset date · Permanently shut downReactor units at site: 3
    61.7 kmStraight-line distance

Source: Global Energy Monitor · Global Nuclear Power Tracker · Dataset date: 2026-08

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

Subsequent earthquakes nearby

Events recorded after this earthquake within 150 km. They are not automatically classified as aftershocks.

First 6 hours4
First 24 hours4
First 72 hours6
Strongest subsequent eventM6.0
M5.22025-08-21 22:34:49 UTC23.0 kmNear East Coast of Honshu, Japan M4.92025-08-21 23:06:10 UTC31.3 kmNear East Coast of Honshu, Japan M5.02025-08-21 23:06:18 UTC107.7 kmEvent of magnitude 5.0, near of Sendai (Monde) M4.52025-08-21 23:06:18 UTC8.1 km47 km SE of Ōfunato, Japan M3.72025-08-23 17:18:30 UTC18.4 kmNEAR EAST COAST OF HONSHU, JAPAN M3.62025-08-24 04:58:30 UTC99.1 kmNEAR EAST COAST OF HONSHU, JAPAN M3.32025-08-25 02:25:30 UTC22.6 kmNEAR EAST COAST OF HONSHU, JAPAN M4.02025-08-28 09:31:30 UTC51.9 kmNEAR EAST COAST OF HONSHU, JAPAN M5.72025-08-29 16:29:14 UTC76.5 kmNear East Coast of Honshu, Japan M5.82025-08-29 16:29:16 UTC41.0 kmNear East Coast of Honshu, Japan M5.62025-08-29 16:29:18 UTC22.9 kmEvent of magnitude 5.6, near of Sendai (Monde) M5.52025-08-29 16:29:19 UTC51.7 kmNear east coast of eastern Honshu, Japan [Sea: Japan]

No unambiguous area assignment

Context for this earthquake

This event has no unambiguous country assignment in the analysed catalogue. It is therefore not assigned to a regional profile.

Earthquake overview

Historical context nearby

Comparison with recorded earthquakes before this event within 150 km.

Magnitude rank#1
Earlier events M≥452
Earlier events M≥56
Compared since2025-01-05

The QuakeMap24 comparison dataset begins on 2024-03-23. Earlier earthquakes may not be included.

Strongest earlier events

M5.52025-08-21 22:34:41 UTC13.2 kmNear East Coast of Honshu, Japan M5.52025-06-14 10:46:56 UTC58.7 km M5.42025-08-21 22:34:42 UTC20.3 kmEvent of magnitude 5.4, near of Sendai (Monde) M5.22025-02-12 21:04:27 UTC65.3 kmNear East Coast of Honshu, Japan M5.12025-06-14 10:46:54 UTC45.7 kmNear East Coast of Honshu, Japan

Stats (last 24h)

Global (24h)
519
Country (24h)
—
—
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