QuakeIndex

Earthquake · reviewed by a seismologist

M 1.8md

Earthquake near Pastos, PR

No earthquake was likely felt in Pastos in the 24 hours to 4:37 pm AST (20:37 UTC). The last one was M 3.3, 32 km (20 mi) SSW, at 8:40 am AST on 1 November 2026, estimated intensity II (weak) in town. Every earthquake near Pastos

This page: a magnitude 1.8 earthquake was recorded 4 km (3 mi) east of Pastos, PR, at 12:29 pm AST on 6 August 2025 (16:29 UTC), 11 km deep.

USGS: 4 km E of Pastos, Puerto Rico

36 km (23 mi) SSW of San Juan, PR · 23 km (14 mi) SW of Caguas, PR

12:29 pm AST, Aug 6, 2025 · · 11 km deep · released about 17 lb of TNT

Every earthquake near Pastos Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Aibonito Municipio 5 kmCayey Municipio 7 kmCidra Municipio 9 kmComerío Municipio 13 kmBarranquitas Municipio 14 kmCoamo Municipio 15 kmSalinas Municipio 16 kmGuayama Municipio 18 kmAguas Buenas Municipio 19 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
12:29 pm AST on 6 August 2025 ()
Where
4 km (3 mi) east of Pastos, PR · earthquakes near Pastos
Magnitude
M 1.8 (md)
Depth
11 km below the surface
Felt
no reports yet
Nearest
Aibonito Municipio, 5 km WNW
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 462 days ago

This was a minor earthquake. Quakes this small are rarely felt and do not cause damage.

At this magnitude and depth, people at rest would likely notice it out to about 9 km (6 mi) from the epicentre. In Pastos, 4 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.

Likely felt in: Cayey 6 km, intensity II. Estimated for each town centre; each link is that town's own record.

How big was it?

This earthquake released about 17 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 2.8 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 870,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 620,000× the energy of this one
  3. Around the size people start to feel M 3.0 55× the energy of this one
  4. This earthquake M 1.8 about 17 lb of TNT

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 4.6 on 2016-12-05 — about 14,000 times the energy of this one.

Before 2016, the USGS record lists 2 earthquakes of M5 or more within 50 km:

  1. 5.1 3 km W of Aguas Buenas, Puerto Rico · 19 km NNE of this epicentre
  2. 5.0 3 km N of Brenas, Puerto Rico · 45 km NNW 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 18.1120, -66.2198. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection from the epicentre
Aibonito Municipio, PR 5 km (3 mi) WNW earthquakes near Aibonito Municipio
Cayey Municipio, PR 7 km (5 mi) E earthquakes near Cayey Municipio
Cidra Municipio, PR 9 km (6 mi) NE earthquakes near Cidra Municipio
Comerío Municipio, PR 13 km (8 mi) N earthquakes near Comerío Municipio
Barranquitas Municipio, PR 14 km (8 mi) NW earthquakes near Barranquitas Municipio
Coamo Municipio, PR 15 km (9 mi) W earthquakes near Coamo Municipio

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

Aftershocks so far

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

  1. 2.0 4 km SSW of Arroyo, Puerto Rico
  2. 2.9 1 km WSW of Bayamon, Puerto Rico
  3. 3.0 4 km NNW of Dorado, Puerto Rico
  4. 2.1 1 km NE of Las Ochenta, Puerto Rico
  5. 2.2 5 km NW of Orocovis, Puerto Rico
  6. 1.5 1 km SE of Salinas, Puerto Rico
  7. 2.9 2 km S of Cayey, Puerto Rico
  8. 1.9 2 km SE of Cidra, Puerto Rico
  9. 1.6 6 km SSE of Lamboglia, Puerto Rico
  10. 2.8 10 km S of Santa Isabel, Puerto Rico
  11. 2.6 10 km S of Santa Isabel, Puerto Rico
  12. 2.8 9 km S of Santa Isabel, Puerto Rico
  13. 2.4 13 km S of Santa Isabel, Puerto Rico
  14. 3.0 3 km SW of Vega Alta, Puerto Rico
  15. 2.4 4 km NW of Orocovis, 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.