QuakeIndex

Earthquake · reviewed by a seismologist

M 3.2md

Earthquake near Cidra, PR

No earthquake was likely felt in Cidra in the 24 hours to 12:50 pm AST (16:50 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 3.2 earthquake was recorded in Cidra, PR, at 12:38 am AST on 2 September 2024 (04:38 UTC), 78 km deep. 4 people have reported feeling it to USGS.

USGS: 0 km ENE of Cidra, Puerto Rico

27 km (17 mi) SSW of San Juan, PR · 14 km (8 mi) WSW of Caguas, PR

12:38 am AST, Sep 2, 2024 · · 78 km deep · released about 1,900 lb of TNT

Every earthquake near Cidra Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Cidra Municipio 1 kmCayey Municipio 8 kmComerío Municipio 9 kmAguas Buenas Municipio 9 kmCaguas Municipio 12 kmAibonito Municipio 13 kmNaranjito Municipio 16 kmBarranquitas Municipio 16 kmGuaynabo 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
12:38 am AST on 2 September 2024 ()
Where
in Cidra, PR · earthquakes near Cidra
Magnitude
M 3.2 (md)
Depth
78 km below the surface
Felt
4 reports · strongest reported intensity II
Nearest
Cidra Municipio, 1 km SW
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 726 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: Parcelas La Milagrosa, Parcelas Nuevas, Santa Clara, Sumidero, Cayey, G. L. Garcia.

How big was it?

This earthquake released about 1,900 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 6.7 180,000× the energy of this one
  2. Mineral, Virginia 2011 M 5.8 7,900× the energy of this one
  3. Magna, Utah 2020 M 5.7 5,600× the energy of this one
  4. This earthquake M 3.2 about 1,900 lb of TNT
  5. Around the size people start to feel M 3.0 this one released 2× 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 4.6 on 2016-12-05 — about 130 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 · 9 km NNE of this epicentre
  2. 5.0 3 km N of Brenas, Puerto Rico · 41 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 18.1787, -66.1552. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection from the epicentre
Cidra Municipio, PR 1 km (1 mi) SW earthquakes near Cidra Municipio
Cayey Municipio, PR 8 km (5 mi) S earthquakes near Cayey Municipio
Comerío Municipio, PR 9 km (5 mi) NW earthquakes near Comerío Municipio
Aguas Buenas Municipio, PR 9 km (6 mi) NNE 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

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

  1. 2.5 18 km S of Lamboglia, Puerto Rico
  2. 3.0 18 km S of Lamboglia, Puerto Rico
  3. 3.0 11 km NNW of San Juan, Puerto Rico
  4. 2.9 13 km SW of Santa Isabel, Puerto Rico
  5. 1.9 2 km W of Potala Pastillo, Puerto Rico
  6. 2.2 2 km E of Cayey, Puerto Rico
  7. 2.0 4 km NNW of Jobos, Puerto Rico
  8. 2.3 11 km SSE of Arroyo, Puerto Rico
  9. 2.5 5 km NNW of Jagual, Puerto Rico
  10. 1.8 4 km NNW of Yaurel, Puerto Rico
  11. 2.8 0 km SW of Santa Isabel, Puerto Rico
  12. 2.2 2 km WSW of Potala Pastillo, Puerto Rico
  13. 3.2 3 km SE of Bartolo, Puerto Rico
  14. 2.4 5 km SSE of Emajagua, Puerto Rico
  15. 2.9 9 km NNE of Brenas, 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.