Reviewed by USGSGuam6d ago
M4.9 earthquake 93 km ESE of Yigo Village, Guam
Sunday, September 20, 2026, 06:47:56 UTC · 13.265°N, 145.708°E
A magnitude 4.9 earthquake struck 93 km ESE of Yigo Village, Guam on Sunday, September 20, 2026, 06:47:56 UTC, at a depth of 10.0 km (shallow). It is the strongest earthquake within 300 km since an M5.3 on September 20, 2026.
- Magnitude
- 4.9
- Light · mb
- Depth
- 10 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
338 tons of TNT
That is about 1/45 of the Hiroshima bomb. A magnitude 5.0 releases about 1 times more energy.
Tectonic setting
55 km
from the nearest mapped plate boundary, between the Mariana and Pacific plates. Earthquakes cluster along boundaries like this one, where plates collide, pull apart or slide past each other.
Depth: shallow
10 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 758 M5.0+ earthquakes within 300 km before this one (catalog from 1900; older records are less complete). The strongest:
- 7.832 km S of Inarajan Village, GuamAugust 8, 1993 · 103 km W of this epicenter
- 7.6198 km E of Saipan, Northern Mariana IslandsApril 5, 1990 · 290 km NE of this epicenter
- 7.2265 km S of Merizo Village, GuamJanuary 28, 1931 · 299 km SW of this epicenter
- 7.1261 km S of Merizo Village, GuamMay 9, 1917 · 297 km SW of this epicenter
- 7.120 km SSW of Merizo Village, GuamApril 26, 2002 · 120 km W of this epicenter
- 7.0176 km ESE of San Jose Village, Northern Mariana IslandsMay 18, 1913 · 186 km NE of this epicenter
- 7.098 km SSE of Inarajan Village, GuamDecember 9, 1909 · 126 km SW of this epicenter
- 7.032 km NNE of Yigo Village, GuamOctober 26, 1912 · 102 km NW of this epicenter
History · NOAA
Deadliest earthquakes in this area
NOAA’s significant-earthquake database lists 14 damaging, deadly or tsunami-generating earthquakes within 300 km of this epicenter since 1700. The most severe:
- 1993M7.8
Tuman Bay, Apra Harbor
8 Aug 1993 · 103 km away · intensity IX
$250 million damagetsunami
- 1849M7.5
Guam
25 Jan 1849 · 273 km away · intensity IX
Severe damage ($5–24M)tsunami
- 1909M8.0
Guam
9 Dec 1909 · 115 km away · intensity VIII
Moderate damage ($1–5M)tsunami
- 1892M7.5
Guam
16 May 1892 · 273 km away · intensity VIII
Moderate damage ($1–5M)tsunami
- 2001M7.0
Guam
12 Oct 2001 · 102 km away · intensity VIII
Moderate damage ($1–5M)
- 1825
Ladrones Island
Apr 1825 · 273 km away · intensity VIII
Moderate damage ($1–5M)tsunami
NOAA NCEI Global Significant Earthquake Database. Historical figures are estimates; older records are incomplete.