Reviewed by USGS3d ago
M5.0 earthquake in Mariana Islands region
Wednesday, September 23, 2026, 13:01:51 UTC · 21.662°N, 143.024°E
A magnitude 5.0 earthquake struck in Mariana Islands region on Wednesday, September 23, 2026, 13:01:51 UTC, at a depth of 306.0 km (deep). It is the strongest earthquake within 300 km since an M5.0 on September 22, 2026.
- Magnitude
- 5.0
- Moderate · mb
- Depth
- 306 km
- Deep
- 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
477 tons of TNT
That is about 1/32 of the Hiroshima bomb. Each whole step in magnitude is about 32 times more energy.
Tectonic setting
20 km
from the nearest mapped plate boundary, between the Philippine Sea and Mariana plates. Earthquakes cluster along boundaries like this one, where plates collide, pull apart or slide past each other.
Depth: deep
306 km
Deep earthquakes (over 300 km) happen deep inside subducting plates. They rarely cause damage, but can be felt faintly over very large distances.
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 75 km
USGS has not published any M2.5+ earthquake within 75 km since this event.
Regional history
Past M5+ earthquakes within 300 km
USGS lists 387 M5.0+ earthquakes within 300 km before this one (catalog from 1900; older records are less complete). The strongest:
- 7.9Volcano Islands, Japan regionNovember 24, 1914 · 85 km NW of this epicenter
- 7.6Volcano Islands, Japan regionMarch 28, 2000 · 105 km NE of this epicenter
- 7.5Volcano Islands, Japan regionFebruary 24, 1934 · 190 km NE of this epicenter
- 7.5Volcano Islands, Japan regionSeptember 28, 2007 · 54 km NW of this epicenter
- 7.2Mariana Islands regionJuly 11, 1905 · 91 km E of this epicenter
- 7.2Volcano Islands, Japan regionAugust 27, 1954 · 259 km N of this epicenter
- 7.2Mariana Islands regionJune 19, 1947 · 253 km E of this epicenter
- 7.2Volcano Islands, Japan regionFebruary 1, 1954 · 270 km N of this epicenter
History · NOAA
Deadliest earthquakes in this area
NOAA’s significant-earthquake database lists 3 damaging, deadly or tsunami-generating earthquakes within 300 km of this epicenter since 1700. The most severe:
- 1914M8.1
Volcano Islands
24 Nov 1914 · 38 km away
- 2000M7.6
Volcano Islands
28 Mar 2000 · 105 km away
- 2007M7.5
Volcano Islands
28 Sep 2007 · 54 km away
NOAA NCEI Global Significant Earthquake Database. Historical figures are estimates; older records are incomplete.