QuakeIndex

Earthquake · reviewed by a seismologist

M 1.9md

Earthquake near Cidra, PR

No earthquake was likely felt in Cidra in the 24 hours to 3:51 am AST (07:51 UTC). The last one was M 3.3, 44 km (27 mi) SW, at 8:40 am AST on 1 November 2026, estimated intensity II (weak) in town. Every earthquake near Cidra

This page: a magnitude 1.9 earthquake was recorded 3 km (2 mi) southeast of Cidra, PR, at 6:26 pm AST on 1 October 2025 (22:26 UTC), 29 km deep.

USGS: 2 km SE of Cidra, Puerto Rico

29 km (18 mi) SSW of San Juan, PR · 14 km (9 mi) SW of Caguas, PR

6:26 pm AST, Oct 1, 2025 · · 29 km deep · released about 24 lb of TNT

Every earthquake near Cidra Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Cidra Municipio 3 kmCayey Municipio 6 kmComerío Municipio 11 kmAguas Buenas Municipio 12 kmCaguas Municipio 12 kmAibonito Municipio 13 kmSan Lorenzo Municipio 18 kmBarranquitas Municipio 18 kmNaranjito 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
6:26 pm AST on 1 October 2025 ()
Where
3 km (2 mi) southeast of Cidra, PR · earthquakes near Cidra
Magnitude
M 1.9 (md)
Depth
29 km below the surface
Felt
no reports yet
Nearest
Cidra Municipio, 3 km NW
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 406 days ago

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

At this magnitude and depth it was probably too small to be felt, even directly above it. In Cidra, 3 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.

Earthquakes near other towns within 30 km: Parcelas Nuevas, Parcelas La Milagrosa, Cayey, G. L. Garcia, Santa Clara, Sumidero.

How big was it?

This earthquake released about 24 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 2.9 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 640,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 450,000× the energy of this one
  3. Around the size people start to feel M 3.0 40× the energy of this one
  4. This earthquake M 1.9 about 24 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 10,000 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 · 12 km N of this epicentre
  2. 5.0 3 km N of Brenas, Puerto Rico · 44 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 18.1540, -66.1457. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection from the epicentre
Cidra Municipio, PR 3 km (2 mi) NW earthquakes near Cidra Municipio
Cayey Municipio, PR 6 km (4 mi) S earthquakes near Cayey Municipio
Comerío Municipio, PR 11 km (7 mi) NW earthquakes near Comerío Municipio
Aguas Buenas Municipio, PR 12 km (7 mi) N earthquakes near Aguas Buenas Municipio
Caguas Municipio, PR 12 km (7 mi) ENE earthquakes near Caguas Municipio
Aibonito Municipio, PR 13 km (8 mi) WSW earthquakes near Aibonito Municipio

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

Aftershocks so far

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

  1. 1.9 4 km SE of Jagual, Puerto Rico
  2. 2.6 5 km NNW of Aguas Buenas, Puerto Rico
  3. 2.7 5 km WSW of Central Aguirre, Puerto Rico
  4. 2.1 5 km WSW of Central Aguirre, Puerto Rico
  5. 2.3 2 km S of G. L. Garcia, Puerto Rico
  6. 1.9 1 km ENE of Cayey, Puerto Rico
  7. 1.8 2 km E of Cayey, Puerto Rico
  8. 3.1 2 km NE of Bayamón, Puerto Rico
  9. 3.1 1 km SSE of Guaynabo, Puerto Rico
  10. 1.9 1 km E of Cayey, Puerto Rico
  11. 1.8 3 km NNE of Jobos, Puerto Rico
  12. 2.4 2 km WSW of Coto Laurel, Puerto Rico
  13. 2.1 1 km SSE of Santa Isabel, Puerto Rico
  14. 3.3 5 km NNE of Aguas Buenas, Puerto Rico
  15. 1.9 3 km E of G. L. Garcia, 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.