QuakeIndex

Earthquake · reviewed by a seismologist

M 3.5md

Earthquake near Camuy, PR

No earthquake was likely felt in Camuy in the 24 hours to 10:48 am AST (14:48 UTC). The last one was M 3.4, 39 km (25 mi) NNW, at 9:00 pm AST on 27 October 2026, estimated intensity II (weak) in town. Every earthquake near Camuy

This page: a magnitude 3.5 earthquake was recorded 9 km (5 mi) northwest of Camuy, PR, at 10:31 pm AST on 2 January 2023 (02:31 UTC), 5.0 km deep.

USGS: 8 km NW of Camuy, Puerto Rico

89 km (55 mi) W of San Juan, PR · 20 km (12 mi) WNW of Arecibo, PR

10:31 pm AST, Jan 2, 2023 · · 5.0 km deep · released about 2.3 tons of TNT

Every earthquake near Camuy Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Quebradillas Municipio 10 kmCamuy Municipio 12 kmIsabela Municipio 15 kmHatillo Municipio 16 kmSan Sebastián Municipio 26 kmArecibo Municipio 26 kmMoca Municipio 28 kmAguadilla Municipio 28 kmLares Municipio 30 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
10:31 pm AST on 2 January 2023 ()
Where
9 km (5 mi) northwest of Camuy, PR · earthquakes near Camuy
Magnitude
M 3.5 (md)
Depth
5.0 km below the surface
Felt
no reports yet
Nearest
Quebradillas Municipio, 10 km SSW
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 1408 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, people at rest would likely notice it out to about 61 km (38 mi) from the epicentre. In Camuy, 9 km away, the estimate is intensity III (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: Quebradillas 10 km, intensity III · Hatillo 10 km, intensity III · Isabela 15 km, intensity III · Arecibo 20 km, intensity III · Rafael Hernandez 22 km, intensity III · San Sebastián 26 km, intensity II · Lares 28 km, intensity II · Aguadilla 31 km, intensity II. Estimated for each town centre; each link is that town's own record.

How big was it?

This earthquake released about 2.3 tons of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 4.5 would have released about 32 times as much.

  1. Northridge, California 1994 M 6.7 72,000× the energy of this one
  2. Mineral, Virginia 2011 M 5.8 3,200× the energy of this one
  3. Magna, Utah 2020 M 5.7 2,300× the energy of this one
  4. This earthquake M 3.5 about 2.3 tons of TNT
  5. Around the size people start to feel M 3.0 this one released 4.9× 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 4.2 on 2022-12-30 — about 12 times the energy of this one.

Before 2016, the USGS record lists 10 earthquakes of M5 or more within 50 km; the five largest:

  1. 7.7 45 km N of San Antonio, Puerto Rico · 46 km NNW of this epicentre
  2. 7.1 24 km NNW of San Antonio, Puerto Rico · 36 km WNW of this epicentre
  3. 6.3 6 km WNW of Aguadilla, Puerto Rico · 36 km WSW of this epicentre
  4. 6.1 15 km WNW of San Antonio, Puerto Rico · 36 km W of this epicentre
  5. 6.1 18 km NNW of San Antonio, Puerto Rico · 32 km WNW 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 18.5491, -66.8916. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection from the epicentre
Quebradillas Municipio, PR 10 km (6 mi) SSW earthquakes near Quebradillas Municipio
Camuy Municipio, PR 12 km (7 mi) SSE earthquakes near Camuy Municipio
Isabela Municipio, PR 15 km (9 mi) WSW earthquakes near Isabela Municipio
Hatillo Municipio, PR 16 km (10 mi) SE earthquakes near Hatillo Municipio
San Sebastián Municipio, PR 26 km (16 mi) SSW earthquakes near San Sebastián Municipio
Arecibo Municipio, PR 26 km (16 mi) ESE earthquakes near Arecibo Municipio

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

Aftershocks so far

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

  1. 2.6 5 km SW of Maricao, Puerto Rico
  2. 3.0 27 km N of Hatillo, Puerto Rico
  3. 3.1 38 km NNW of San Antonio, Puerto Rico
  4. 3.1 Mona Passage
  5. 2.9 1 km NNE of La Playa, Puerto Rico
  6. 3.4 40 km N of San Antonio, Puerto Rico
  7. 3.1 5 km N of Garrochales, Puerto Rico
  8. 2.2 4 km E of Hormigueros, Puerto Rico
  9. 2.9 0 km NW of Stella, Puerto Rico
  10. 3.1 2 km WSW of Las Marias, Puerto Rico
  11. 2.7 7 km E of Mayagüez, Puerto Rico
  12. 1.9 Mona Passage
  13. 3.3 47 km N of Arecibo, Puerto Rico
  14. 2.4 Puerto Rico region
  15. 2.6 0 km S of Maricao, 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.