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M3.1 Depth: 55.9 km

M3.1 Earthquake near 3 km SW of Vega Alta, Puerto Rico (United States)

UTC time: 2025-09-09 11:46:43 UTC Local time: —

About this earthquake

A magnitude M3.1 earthquake was recorded near 3 km SW of Vega Alta, Puerto Rico (United States) on September 9, 2025 at 11:46 UTC. The hypocenter lay relatively close to the surface at around 56 km, increasing how strongly it was felt. Shaking of this size is frequently noticed but usually harmless.

The event was recorded by USGS. United States: over the past 24 hours, QuakeMap24 logged 192 earthquakes, the strongest at M4.8.

Details

Magnitude
M3.1
Depth
55.9 km
UTC time
2025-09-09 11:46:43 UTC
Local time
—
Country
United States
City
Puerto Rico
Source
usgs
Coordinates
18.39317, -66.35367
Temperature
29.9°C

Map

Depth profile

Depth profile Depth: 55.9 km (Shallow) Surface Shallow Intermediate Deep 0 km 70 km 300 km 700 km 55.9 km
Shallow
55.9 km
55.9 km — deeper than the regional average (15.4 km)
Regional average: 15.4 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

  • Saba
    Distance: 341 km ·Stratovolcano ·Elevation: 887 m ·Last eruption: 1640 ·Netherlands
  • Quill, The
    Distance: 373 km ·Stratovolcano ·Elevation: 601 m ·Last eruption: 250 ·Netherlands
  • Liamuiga
    Distance: 393 km ·Stratovolcano ·Elevation: 1'156 m ·Last eruption: 160 ·Saint Kitts and Nevis
  • Nevis Peak
    Distance: 423 km ·Stratovolcano ·Elevation: 985 m ·Saint Kitts and Nevis
  • Soufriere Hills
    Distance: 480 km ·Stratovolcano ·Elevation: 915 m ·Last eruption: 2013 ·United Kingdom

Historic earthquake map · United States

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Country statistics · United States

Country overview
View earthquake KPIs, strongest and latest events, and averages for this country.

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