QuakeIndex

Earthquake · reviewed by a seismologist

M 3.0md

Earthquake near Monte Grande, PR

No earthquake was likely felt in Monte Grande in the 24 hours to 11:06 pm AST (03:06 UTC). The last one was M 2.1, 9 km (6 mi) S, at 11:57 pm AST on 8 November 2026, estimated intensity II (weak) in town. Every earthquake near Monte Grande

This page: a magnitude 3.0 earthquake was recorded in Monte Grande, PR, at 6:55 pm AST on 30 December 2022 (22:55 UTC), 18 km deep. 1 person has reported feeling it to USGS.

USGS: 1 km SSE of Monte Grande, Puerto Rico

15 km (9 mi) SSE of Mayagüez, PR · 115 km (72 mi) WSW of San Juan, PR

6:55 pm AST, Dec 30, 2022 · · 18 km deep · released about 1,100 lb of TNT

Every earthquake near Monte Grande Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Hormigueros Municipio 7 kmSan Germán Municipio 8 kmCabo Rojo Municipio 12 kmLajas Municipio 12 kmSabana Grande Municipio 16 kmMaricao Municipio 21 kmLas Marías Municipio 21 kmGuánica Municipio 23 kmAñasco Municipio 24 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
6:55 pm AST on 30 December 2022 ()
Where
in Monte Grande, PR · earthquakes near Monte Grande
Magnitude
M 3.0 (md)
Depth
18 km below the surface
Felt
1 report · strongest reported intensity II
Nearest
Hormigueros Municipio, 7 km NNW
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 1412 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 33 km (21 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: San Germán 6 km, intensity II · Puerto Real 9 km, intensity II · Pole Ojea 14 km, intensity II · Mayagüez 15 km, intensity II · Yauco 27 km, intensity II · San Sebastián 31 km, intensity II · Guayanilla 33 km, intensity II. Estimated for each town centre; each link is that town's own record.

How big was it?

This earthquake released about 1,100 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 6.7 320,000× the energy of this one
  2. Mineral, Virginia 2011 M 5.8 14,000× the energy of this one
  3. Magna, Utah 2020 M 5.7 10,000× the energy of this one
  4. This earthquake M 3.0 about 1,100 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 110,000 times the energy of this one.

Before 2016, the USGS record lists 4 earthquakes of M5 or more within 50 km:

  1. 6.3 6 km WNW of Aguadilla, Puerto Rico · 43 km NNW of this epicentre
  2. 5.8 4 km E of Moca, Puerto Rico · 36 km N of this epicentre
  3. 5.2 19 km SW of Stella, Puerto Rico · 31 km WNW of this epicentre
  4. 5.1 21 km SW of Stella, Puerto Rico · 31 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 18.0732, -67.0983. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection from the epicentre
Hormigueros Municipio, PR 7 km (4 mi) NNW earthquakes near Hormigueros Municipio
San Germán Municipio, PR 8 km (5 mi) ENE earthquakes near San Germán Municipio
Cabo Rojo Municipio, PR 12 km (8 mi) SW earthquakes near Cabo Rojo Municipio
Lajas Municipio, PR 12 km (8 mi) SSE earthquakes near Lajas Municipio
Sabana Grande Municipio, PR 16 km (10 mi) E earthquakes near Sabana Grande Municipio
Maricao Municipio, PR 21 km (13 mi) ENE earthquakes near Maricao Municipio

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

Aftershocks so far

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

  1. 2.3 Puerto Rico region
  2. 2.2 0 km WNW of Guayanilla, Puerto Rico
  3. 2.4 7 km SW of Tallaboa, Puerto Rico
  4. 1.9 2 km SE of Cabo Rojo, Puerto Rico
  5. 2.2 15 km S of Guánica, Puerto Rico
  6. 1.9 Puerto Rico region
  7. 2.6 4 km SW of Indios, Puerto Rico
  8. 2.2 10 km SSE of Maria Antonia, Puerto Rico
  9. 3.2 0 km WNW of Mayag?ez, Puerto Rico
  10. 2.4 Puerto Rico region
  11. 2.3 3 km S of Indios, Puerto Rico
  12. 2.1 4 km WSW of Guánica, Puerto Rico
  13. 2.5 0 km S of Fuig, Puerto Rico
  14. 1.7 Puerto Rico region
  15. 2.9 Puerto Rico region

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.