QuakeIndex

Earthquake · reviewed by a seismologist

M 2.4md

Earthquake near Cidra, PR

No earthquake was likely felt in Cidra in the 24 hours to 12:49 pm AST (16:49 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 2.4 earthquake was recorded in Cidra, PR, at 2:00 pm AST on 31 May 2020 (18:00 UTC), 29 km deep.

USGS: 0 km N of Cidra, Puerto Rico

27 km (17 mi) SSW of San Juan, PR · 14 km (9 mi) WSW of Caguas, PR

2:00 pm AST, May 31, 2020 · · 29 km deep · released about 130 lb of TNT

Every earthquake near Cidra Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Cidra Municipio 1 kmComerío Municipio 8 kmAguas Buenas Municipio 9 kmCayey Municipio 9 kmCaguas Municipio 12 kmAibonito Municipio 12 kmNaranjito Municipio 15 kmBarranquitas Municipio 16 kmBayamón Municipio 18 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
2:00 pm AST on 31 May 2020 ()
Where
in Cidra, PR · earthquakes near Cidra
Magnitude
M 2.4 (md)
Depth
29 km below the surface
Felt
no reports yet
Nearest
Cidra Municipio, 1 km S
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 2355 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. 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, Santa Clara, Parcelas Nuevas, Sumidero, Comerío, Cayey.

How big was it?

This earthquake released about 130 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 3.4 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 110,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 80,000× the energy of this one
  3. Around the size people start to feel M 3.0 7.2× the energy of this one
  4. This earthquake M 2.4 about 130 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 1,800 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 · 40 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 18.1838, -66.1621. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection from the epicentre
Cidra Municipio, PR 1 km (1 mi) S earthquakes near Cidra Municipio
Comerío Municipio, PR 8 km (5 mi) NW earthquakes near Comerío Municipio
Aguas Buenas Municipio, PR 9 km (5 mi) NNE earthquakes near Aguas Buenas Municipio
Cayey Municipio, PR 9 km (6 mi) S earthquakes near Cayey Municipio
Caguas Municipio, PR 12 km (8 mi) ENE earthquakes near Caguas Municipio
Aibonito Municipio, PR 12 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

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

  1. 2.9 1 km SSE of Playita Cortada, Puerto Rico
  2. 2.9 1 km SSE of Playita Cortada, Puerto Rico
  3. 3.1 2 km SW of Potala Pastillo, Puerto Rico
  4. 3.1 3 km NNW of Loíza, Puerto Rico
  5. 2.8 3 km SSW of G. L. Garcia, Puerto Rico
  6. 2.6 2 km ESE of Potala Pastillo, Puerto Rico
  7. 3.5 6 km NW of Trujillo Alto, Puerto Rico
  8. 2.7 7 km SSE of Potala Pastillo, Puerto Rico
  9. 3.1 3 km ESE of Jauca, Puerto Rico
  10. 2.9 2 km ESE of Jauca, 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.