QuakeIndex

Earthquake · reviewed by a seismologist

M 3.4md

Earthquake near Cidra, PR

No earthquake was likely felt in Cidra in the 24 hours to 7:46 am AST (11:46 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 3.4 earthquake was recorded in Cidra, PR, at 1:22 pm AST on 4 February 2023 (17:22 UTC), 73 km deep. 1 person has reported feeling it to USGS.

USGS: Puerto Rico region

29 km (18 mi) SSW of San Juan, PR · 16 km (10 mi) WSW of Caguas, PR

1:22 pm AST, Feb 4, 2023 · · 73 km deep · released about 2 tons of TNT

Every earthquake near Cidra Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Cidra Municipio 2 kmCayey Municipio 7 kmComerío Municipio 8 kmAibonito Municipio 10 kmAguas Buenas Municipio 11 kmCaguas Municipio 14 kmBarranquitas Municipio 15 kmNaranjito Municipio 16 kmBayamón 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
1:22 pm AST on 4 February 2023 ()
Where
in Cidra, PR · earthquakes near Cidra
Magnitude
M 3.4 (md)
Depth
73 km below the surface
Felt
1 report · strongest reported intensity II
Nearest
Cidra Municipio, 2 km NE
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 1376 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, Cayey, Santa Clara, Sumidero, Comerío.

How big was it?

This earthquake released about 2 tons of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 4.4 would have released about 32 times as much.

  1. Northridge, California 1994 M 6.7 83,000× the energy of this one
  2. Mineral, Virginia 2011 M 5.8 3,700× the energy of this one
  3. Magna, Utah 2020 M 5.7 2,600× the energy of this one
  4. This earthquake M 3.4 about 2 tons of TNT
  5. Around the size people start to feel M 3.0 this one released 4.3× 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 in our catalogue was M 4.6 on 2016-12-05 — about 59 times the energy of this one.

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 18.1657, -66.1752. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection from the epicentre
Cidra Municipio, PR 2 km (1 mi) NE earthquakes near Cidra Municipio
Cayey Municipio, PR 7 km (5 mi) SSE earthquakes near Cayey Municipio
Comerío Municipio, PR 8 km (5 mi) NW earthquakes near Comerío Municipio
Aibonito Municipio, PR 10 km (6 mi) WSW earthquakes near Aibonito Municipio
Aguas Buenas Municipio, PR 11 km (7 mi) NNE earthquakes near Aguas Buenas Municipio
Caguas Municipio, PR 14 km (9 mi) ENE earthquakes near Caguas 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. 2.9 1 km W of Punta Santiago, Puerto Rico
  2. 2.8 Puerto Rico region
  3. 2.5 19 km SSW of Central Aguirre, Puerto Rico
  4. 3.2 10 km NNW of Levittown, Puerto Rico
  5. 2.9 9 km SSE of Bajandas, Puerto Rico
  6. 3.2 3 km NNW of Jayuya, Puerto Rico
  7. 3.1 6 km ENE of San Juan, Puerto Rico
  8. 2.9 5 km S of Jagual, Puerto Rico
  9. 2.0 1 km NNW of Punta Santiago, Puerto Rico
  10. 3.4 2 km SE of Aguas Buenas, Puerto Rico
  11. 2.4 2 km NW of Punta Santiago, Puerto Rico
  12. 2.0 4 km NW of Yaurel, Puerto Rico
  13. 2.1 20 km SSE of Arroyo, Puerto Rico
  14. 3.4 3 km NNE of Benitez, Puerto Rico
  15. 2.8 0 km SSW of San Juan, 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.