QuakeIndex

Earthquake · reviewed by a seismologist

M 3.1md

Earthquake near Monserrate, PR

No earthquake was likely felt in Monserrate in the 24 hours to 5:26 pm AST (21:26 UTC). The last one was M 4.8, 83 km (52 mi) SW, at 9:19 am AST on 18 September 2026, estimated intensity III (weak) in town; 86 felt reports to USGS. Every earthquake near Monserrate

This page: a magnitude 3.1 earthquake was recorded in Monserrate, PR, at 8:42 am AST on 7 July 2026 (12:42 UTC), 89 km deep.

USGS: 0 km WNW of Monserrate, Puerto Rico

32 km (20 mi) W of San Juan, PR · 22 km (14 mi) WNW of Bayamón, PR

8:42 am AST, Jul 7, 2026 · · 89 km deep · released about 1,600 lb of TNT

Every earthquake near Monserrate Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Vega Alta Municipio 3 kmVega Baja Municipio 4 kmDorado Municipio 12 kmManatí Municipio 13 kmMorovis Municipio 15 kmToa Alta Municipio 15 kmCorozal Municipio 16 kmToa Baja Municipio 18 kmNaranjito Municipio 20 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
8:42 am AST on 7 July 2026 ()
Where
in Monserrate, PR · earthquakes near Monserrate
Magnitude
M 3.1 (md)
Depth
89 km below the surface
Felt
no reports yet
Measured shaking
intensity II (ShakeMap)
Nearest
Vega Alta Municipio, 3 km E
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 53 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 it was probably too small to be felt, even directly above it. 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.

Earthquakes near other towns within 30 km: Ceiba, Vega Baja, Sabana, Brenas, Vega Alta, Miranda.

How big was it?

This earthquake released about 1,600 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 4.2 would have released about 32 times as much.

  1. Northridge, California 1994 M 6.7 210,000× the energy of this one
  2. Mineral, Virginia 2011 M 5.8 9,400× the energy of this one
  3. Magna, Utah 2020 M 5.7 6,700× the energy of this one
  4. This earthquake M 3.1 about 1,600 lb of TNT
  5. Around the size people start to feel M 3.0 this one released 1.7× 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 4.4 on 2018-12-09 — about 75 times the energy of this one.

Before 2016, the USGS record lists 3 earthquakes of M5 or more within 50 km:

  1. 5.8 12 km N of Garrochales, Puerto Rico · 25 km WNW of this epicentre
  2. 5.1 3 km W of Aguas Buenas, Puerto Rico · 31 km SE of this epicentre
  3. 5.0 3 km N of Brenas, Puerto Rico · 7 km NNE 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 18.4383, -66.3665. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection from the epicentre
Vega Alta Municipio, PR 3 km (2 mi) E earthquakes near Vega Alta Municipio
Vega Baja Municipio, PR 4 km (2 mi) WNW earthquakes near Vega Baja Municipio
Dorado Municipio, PR 12 km (7 mi) ENE earthquakes near Dorado Municipio
Manatí Municipio, PR 13 km (8 mi) W earthquakes near Manatí Municipio
Morovis Municipio, PR 15 km (9 mi) SSW earthquakes near Morovis Municipio
Toa Alta Municipio, PR 15 km (9 mi) ESE earthquakes near Toa Alta Municipio

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

Aftershocks so far

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

  1. 2.4 19 km NNE of Arecibo, Puerto Rico
  2. 2.3 4 km N of Brenas, Puerto Rico
  3. 2.9 7 km NNE of Brenas, Puerto Rico
  4. 2.9 0 km E of Parcelas Peñuelas, Puerto Rico
  5. 2.7 5 km SW of Guaynabo, Puerto Rico
  6. 2.7 14 km N of Carrizales, Puerto Rico
  7. 2.2 0 km SE of Parcelas Peñuelas, Puerto Rico
  8. 2.1 3 km NE of La Plena, Puerto Rico
  9. 2.9 29 km N of San Juan, Puerto Rico
  10. 2.1 5 km NNW of Coto Laurel, Puerto Rico
  11. 2.1 2 km W of Garrochales, Puerto Rico
  12. 1.9 4 km ENE of La Plena, Puerto Rico
  13. 1.7 0 km SW of Coco, Puerto Rico
  14. 2.8 15 km NNE of Dorado, 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.