QuakeScout
Magnitude4.5

Reviewed by USGSJapan region8d ago

M4.5 earthquake in Izu Islands, Japan region

Friday, September 18, 2026, 08:39:05 UTC · 32.343°N, 141.362°E

A magnitude 4.5 earthquake struck in Izu Islands, Japan region on Friday, September 18, 2026, 08:39:05 UTC, at a depth of 35.0 km (shallow). It is the strongest earthquake within 300 km since an M5.0 on September 18, 2026.

Magnitude
4.5
Light · mb
Depth
35 km
Shallow
Felt reports
0
Did You Feel It?
Est. shaking
—
No ShakeMap
PAGER alert
None
Not issued
Tsunami
No flag
USGS feed

Outlined circle: this earthquake

In context

How big was it, and why here?

Energy released

85 tons of TNT

That is about 1/178 of the Hiroshima bomb. A magnitude 5.0 releases about 6 times more energy.

Tectonic setting

62 km

from the nearest mapped plate boundary, between the Philippine Sea and Pacific plates. Earthquakes cluster along boundaries like this one, where plates collide, pull apart or slide past each other.

Depth: shallow

35 km

Shallow earthquakes (under 70 km) produce the strongest surface shaking for their size, so they are the ones most likely to cause damage near the epicenter.

Did You Feel It?

Where it was felt

No “Did You Feel It?” reports have been published for this event yet. If you felt it, you can add your report on the USGS website.

I felt it — report to USGS ↗

USGS PAGER estimate

Who was exposed to shaking

USGS publishes PAGER impact estimates for significant earthquakes, usually within an hour. No PAGER estimate is available for this event.

After the main event

Aftershocks within 50 km

USGS has not published any M2.5+ earthquake within 50 km since this event.

Regional history

Past M5+ earthquakes within 300 km

USGS lists 920 M5.0+ earthquakes within 300 km before this one (catalog from 1900; older records are less complete). The strongest:

  1. 7.9174 km SE of Katsuura, JapanNovember 25, 1953 · 186 km N of this epicenter
  2. 7.3206 km SSE of Wada, JapanDecember 4, 1972 · 118 km NW of this epicenter
  3. 7.3190 km SE of Hasaki, JapanSeptember 7, 1906 · 289 km N of this epicenter
  4. 7.2193 km SSE of Wada, JapanFebruary 29, 1972 · 130 km N of this epicenter
  5. 7.0208 km SE of Katsuura, JapanApril 21, 1916 · 155 km N of this epicenter
  6. 7.0125 km ESE of Katsuura, JapanAugust 18, 1927 · 246 km N of this epicenter
  7. 6.9off the east coast of Honshu, JapanJuly 19, 1944 · 164 km N of this epicenter
  8. 6.8166 km SE of Katsuura, JapanSeptember 18, 1984 · 185 km N of this epicenter

History · NOAA

Deadliest earthquakes in this area

NOAA’s significant-earthquake database lists 28 damaging, deadly or tsunami-generating earthquakes within 300 km of this epicenter since 1700, which together caused about 2 recorded deaths. The most severe:

  1. 1953M7.4

    Kashima

    25 Nov 1953 · 187 km away

    1 deathLimited damage (under $1M)tsunami

  2. 2000M6.1

    Near S Coast Honshu: Kozu-Shima

    1 Jul 2000 · 294 km away

    1 deathLimited damage (under $1M)tsunami

  3. 1972M7.4

    S Of Honshu, Hachijojima

    4 Dec 1972 · 123 km away · intensity X

    Moderate damage ($1–5M)tsunami

  4. 1972M7.2

    S Of Honshu: Hachijojima, Tokyo

    29 Feb 1972 · 119 km away · intensity X

    Moderate damage ($1–5M)tsunami

  5. 1983M6.0

    Miyakejima, Oshima

    3 Oct 1983 · 247 km away · intensity VIII

    Moderate damage ($1–5M)

  6. 1909M7.5

    Yokohama

    13 Mar 1909 · 240 km away

    Limited damage (under $1M)tsunami

NOAA NCEI Global Significant Earthquake Database. Historical figures are estimates; older records are incomplete.

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