QuakeIndex

Earthquake · reviewed by a seismologist

M 3.0md

Earthquake near Hormigueros, PR

No earthquake was likely felt in Hormigueros in the 24 hours to 11:32 am AST (15:32 UTC). The last one was M 2.1, 15 km (9 mi) S, at 11:57 pm AST on 8 November 2026, estimated intensity II (weak) in town. Every earthquake near Hormigueros

This page: a magnitude 3.0 earthquake was recorded 2 km (2 mi) south-southwest of Hormigueros, PR, at 1:16 am AST on 25 January 2023 (05:16 UTC), 12 km deep. 2 people have reported feeling it to USGS.

USGS: 2 km SSW of Hormigueros, Puerto Rico

9 km (6 mi) S of Mayagüez, PR · 118 km (73 mi) WSW of San Juan, PR

1:16 am AST, Jan 25, 2023 · · 12 km deep · released about 920 lb of TNT

Every earthquake near Hormigueros Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Hormigueros Municipio 3 kmSan Germán Municipio 11 kmCabo Rojo Municipio 14 kmAñasco Municipio 19 kmLajas Municipio 19 kmSabana Grande Municipio 21 kmLas Marías Municipio 21 kmMaricao Municipio 22 kmRincón Municipio 27 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
1:16 am AST on 25 January 2023 ()
Where
2 km (2 mi) south-southwest of Hormigueros, PR · earthquakes near Hormigueros
Magnitude
M 3.0 (md)
Depth
12 km below the surface
Felt
2 reports · strongest reported intensity II
Nearest
Hormigueros Municipio, 3 km ENE
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 1386 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 34 km (21 mi) from the epicentre. In Hormigueros, 2 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: Puerto Real 7 km, intensity III · Mayagüez 9 km, intensity III · San Germán 11 km, intensity III · Pole Ojea 17 km, intensity II · Rincón 27 km, intensity II · San Sebastián 29 km, intensity II · Aguada 29 km, intensity II · Yauco 32 km, intensity II. Estimated for each town centre; each link is that town's own record.

How big was it?

This earthquake released about 920 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 6.7 370,000× the energy of this one
  2. Mineral, Virginia 2011 M 5.8 16,000× 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 920 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 5 earthquakes of M5 or more within 50 km:

  1. 6.3 6 km WNW of Aguadilla, Puerto Rico · 37 km NNW of this epicentre
  2. 6.1 15 km WNW of San Antonio, Puerto Rico · 49 km NNW of this epicentre
  3. 5.8 4 km E of Moca, Puerto Rico · 32 km NNE of this epicentre
  4. 5.2 19 km SW of Stella, Puerto Rico · 26 km WNW of this epicentre
  5. 5.1 21 km SW of Stella, Puerto Rico · 25 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 18.1205, -67.1388. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection from the epicentre
Hormigueros Municipio, PR 3 km (2 mi) ENE earthquakes near Hormigueros Municipio
San Germán Municipio, PR 11 km (7 mi) E earthquakes near San Germán Municipio
Cabo Rojo Municipio, PR 14 km (9 mi) SSW earthquakes near Cabo Rojo Municipio
Añasco Municipio, PR 19 km (12 mi) N earthquakes near Añasco Municipio
Lajas Municipio, PR 19 km (12 mi) SSE earthquakes near Lajas Municipio
Sabana Grande Municipio, PR 21 km (13 mi) E earthquakes near Sabana Grande Municipio

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

Aftershocks so far

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

  1. 2.1 2 km W of Fuig, Puerto Rico
  2. 2.7 3 km WSW of Guánica, Puerto Rico
  3. 2.7 Mona Passage
  4. 2.2 5 km SSW of Indios, Puerto Rico
  5. 2.4 4 km SSW of Indios, Puerto Rico
  6. 2.5 7 km SE of Maria Antonia, Puerto Rico
  7. 1.9 Mona Passage
  8. 1.9 6 km WSW of Fuig, Puerto Rico
  9. 2.5 0 km SSW of Yauco, Puerto Rico
  10. 2.3 Puerto Rico region
  11. 1.9 7 km ESE of La Parguera, Puerto Rico
  12. 1.9 2 km N of Guayanilla, Puerto Rico
  13. 1.7 2 km WSW of Indios, Puerto Rico
  14. 2.7 2 km N of Guayanilla, Puerto Rico
  15. 2.5 3 km E of Hormigueros, 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.