QuakeIndex

Earthquake · reviewed by a seismologist

M 3.0md

Earthquake near Añasco, PR

No earthquake was likely felt in Añasco in the 24 hours to 5:23 pm AST (21:23 UTC). The last one was M 3.0, 36 km (22 mi) SSE, at 5:47 pm AST on 7 November 2026, estimated intensity II (weak) in town. Every earthquake near Añasco

This page: a magnitude 3.0 earthquake was recorded in Añasco, PR, at 4:57 am AST on 24 December 2023 (08:57 UTC), 25 km deep.

USGS: 0 km SSW of Añasco, Puerto Rico

9 km (5 mi) N of Mayagüez, PR · 115 km (71 mi) W of San Juan, PR

4:57 am AST, Dec 24, 2023 · · 25 km deep · released about 890 lb of TNT

Every earthquake near Añasco Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Añasco Municipio 2 kmAguada Municipio 12 kmMoca Municipio 13 kmRincón Municipio 13 kmHormigueros Municipio 16 kmLas Marías Municipio 18 kmSan Sebastián Municipio 19 kmSan Germán Municipio 22 kmAguadilla Municipio 22 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
4:57 am AST on 24 December 2023 ()
Where
in Añasco, PR · earthquakes near Añasco
Magnitude
M 3.0 (md)
Depth
25 km below the surface
Felt
no reports yet
Nearest
Añasco Municipio, 2 km NE
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 984 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 25 km (16 mi) from the epicentre. 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: Mayagüez 9 km, intensity II · Aguada 12 km, intensity II · Rincón 13 km, intensity II · Aguadilla 17 km, intensity II · San Sebastián 17 km, intensity II · Rafael Hernandez 22 km, intensity II · Puerto Real 23 km, intensity II · San Germán 24 km, intensity II. Estimated for each town centre; each link is that town's own record.

How big was it?

This earthquake released about 890 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 4.0 would have released about 32 times as much.

  1. Northridge, California 1994 M 6.7 380,000× the energy of this one
  2. Mineral, Virginia 2011 M 5.8 17,000× the energy of this one
  3. Magna, Utah 2020 M 5.7 12,000× the energy of this one
  4. This earthquake M 3.0 about 890 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 6.4 on 2020-01-07 — about 130,000 times the energy of this one.

Before 2016, the USGS record lists 8 earthquakes of M5 or more within 50 km; the five largest:

  1. 7.1 24 km NNW of San Antonio, Puerto Rico · 47 km N of this epicentre
  2. 6.4 32 km NW of Aguadilla, Puerto Rico · 45 km NW of this epicentre
  3. 6.3 6 km WNW of Aguadilla, Puerto Rico · 20 km NNW of this epicentre
  4. 6.1 15 km WNW of San Antonio, Puerto Rico · 32 km NNW of this epicentre
  5. 6.1 18 km NNW of San Antonio, Puerto Rico · 40 km N 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 18.2782, -67.1425. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection from the epicentre
Añasco Municipio, PR 2 km (1 mi) NE earthquakes near Añasco Municipio
Aguada Municipio, PR 12 km (7 mi) NNW earthquakes near Aguada Municipio
Moca Municipio, PR 13 km (8 mi) NNE earthquakes near Moca Municipio
Rincón Municipio, PR 13 km (8 mi) WNW earthquakes near Rincón Municipio
Hormigueros Municipio, PR 16 km (10 mi) S earthquakes near Hormigueros Municipio
Las Marías Municipio, PR 18 km (11 mi) ESE earthquakes near Las Marías Municipio

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

Aftershocks so far

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

  1. 2.3 6 km NNE of Yauco, Puerto Rico
  2. 2.4 2 km SSW of Indios, Puerto Rico
  3. 2.0 5 km SSE of Maria Antonia, Puerto Rico
  4. 1.7 2 km NNW of La Parguera, Puerto Rico
  5. 2.3 5 km SE of Maria Antonia, Puerto Rico
  6. 2.2 6 km SW of Guánica, Puerto Rico
  7. 2.3 3 km N of La Parguera, Puerto Rico
  8. 1.7 3 km NNE of La Parguera, Puerto Rico
  9. 2.8 3 km N of La Parguera, Puerto Rico
  10. 2.4 4 km ESE of La Parguera, Puerto Rico
  11. 3.3 7 km ESE of La Parguera, Puerto Rico
  12. 2.2 5 km E of La Parguera, Puerto Rico
  13. 2.3 5 km NNE of Yauco, Puerto Rico
  14. 2.4 4 km SSW of Indios, Puerto Rico
  15. 2.1 2 km N of Guayanilla, 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.