QuakeIndex

Earthquake · reviewed by a seismologist

M 3.1md

Earthquake near Humacao, PR

No earthquake was likely felt in Humacao in the 24 hours to 9:34 am AST (13:34 UTC). The last one was M 4.1, 56 km (35 mi) ESE, at 5:44 am AST on 28 October 2026, estimated intensity II (weak) in town; 5 felt reports to USGS. Every earthquake near Humacao

This page: a magnitude 3.1 earthquake was recorded 42 km (26 mi) south-southeast of Humacao, PR, at 1:37 pm AST on 6 February 2026 (17:37 UTC), 38 km deep.

USGS: 30 km SE of Emajagua, Puerto Rico

79 km (49 mi) SSE of San Juan, PR

1:37 pm AST, Feb 6, 2026 · · 38 km deep · released about 1,400 lb of TNT

Every earthquake near Humacao Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Maunabo Municipio 32 kmYabucoa Municipio 35 kmPatillas Municipio 39 kmHumacao Municipio 39 kmArroyo Municipio 43 kmVieques Municipio 45 kmNaguabo Municipio 46 kmLas Piedras Municipio 48 kmSan Lorenzo Municipio 50 km
Distance rings around the epicentre, with the nearest towns at their true direction and later quakes as coloured dots. Not a shaking map — see the USGS ShakeMap for that.
When
1:37 pm AST on 6 February 2026 ()
Where
42 km (26 mi) south-southeast of Humacao, PR · earthquakes near Humacao
Magnitude
M 3.1 (md)
Depth
38 km below the surface
Felt
no reports yet
Nearest
Maunabo Municipio, 32 km NW
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 278 days ago

This was a small earthquake. Shaking like this is often felt indoors nearby and very rarely causes damage.

At this magnitude and depth, people at rest would likely notice it out to about 20 km (12 mi) from the epicentre. In Humacao, 42 km away, the estimate is intensity II (weak). Estimated from magnitude, depth and distance with the intensity equation USGS Did You Feel It? uses; felt reports, where there are any, are the measurement.

How big was it?

This earthquake released about 1,400 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 4.1 would have released about 32 times as much.

  1. Northridge, California 1994 M 6.7 230,000× the energy of this one
  2. Mineral, Virginia 2011 M 5.8 10,000× the energy of this one
  3. Magna, Utah 2020 M 5.7 7,400× the energy of this one
  4. This earthquake M 3.1 about 1,400 lb of TNT
  5. Around the size people start to feel M 3.0 this one released 1.5× more

Energy from the Gutenberg–Richter relation (log10E = 1.5M + 4.8), rounded to two figures; bar length is magnitude, which is already a logarithm of energy. Magnitudes of past earthquakes from the USGS catalogue.

For this area

The largest earthquake within 50 km since 2016 was M 4.8 on 2021-10-08 — about 330 times the energy of this one.

Before 2016, the USGS record lists one earthquake of M5 or more within 50 km:

  1. 5.3 68 km SSE of Emajagua, Puerto Rico · 44 km S of this epicentre

Since 2016: the QuakeIndex catalogue (US, M1.5+), built from the USGS FDSN event service. Before 2016: USGS ComCat, M5+ from 1900. Distances are between epicentres. This is the record, not a forecast.

Where

Epicentre 17.7962, -65.6847. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection from the epicentre
Maunabo Municipio, PR 32 km (20 mi) NW earthquakes near Maunabo Municipio
Yabucoa Municipio, PR 35 km (22 mi) NNW earthquakes near Yabucoa Municipio
Patillas Municipio, PR 39 km (24 mi) NW earthquakes near Patillas Municipio
Humacao Municipio, PR 39 km (24 mi) NNW earthquakes near Humacao Municipio
Arroyo Municipio, PR 43 km (26 mi) WNW earthquakes near Arroyo Municipio
Vieques Municipio, PR 45 km (28 mi) NE earthquakes near Vieques Municipio

Places and coordinates from the US Census Bureau Gazetteer (2024). Distances are from the epicentre.

Aftershocks so far

34 earthquakes have been recorded within 50 km since this one.

  1. 2.2 27 km SE of Emajagua, Puerto Rico
  2. 3.0 26 km SE of Emajagua, Puerto Rico
  3. 3.1 12 km SE of Emajagua, Puerto Rico
  4. 3.1 16 km SE of Esperanza, Puerto Rico
  5. 3.1 14 km SSE of Esperanza, Puerto Rico
  6. 2.9 17 km S of Esperanza, Puerto Rico
  7. 2.9 16 km SSE of Esperanza, Puerto Rico
  8. 2.7 24 km SE of Emajagua, Puerto Rico
  9. 2.1 10 km E of El Negro, Puerto Rico
  10. 3.2 11 km SSE of Punta Santiago, Puerto Rico
  11. 2.1 5 km SSE of Bajandas, Puerto Rico
  12. 3.0 6 km SE of Isabel Segunda, Puerto Rico
  13. 2.6 14 km SE of Esperanza, Puerto Rico
  14. 2.4 7 km WNW of Esperanza, Puerto Rico
  15. 2.7 28 km SSW of Esperanza, Puerto Rico

Counted from the QuakeIndex database, which ingests the USGS feed every 30 seconds · as of . QuakeIndex does not forecast aftershocks. When USGS issues an operational aftershock forecast it appears on the USGS event page.

On USGS

QuakeIndex does not issue warnings. For earthquake early warning see ShakeAlert.