QuakeIndex

Earthquake · reviewed by a seismologist

M 2.9md

Earthquake near Fuig, PR

No earthquake was likely felt in Fuig in the 24 hours to 1:35 pm AST (17:35 UTC). The last one was M 2.1, 14 km (8 mi) ENE, at 4:39 pm AST on 9 November 2026, estimated intensity II (weak) in town. Every earthquake near Fuig

This page: a magnitude 2.9 earthquake was recorded 4 km (2 mi) west of Fuig, PR, at 2:09 pm AST on 6 August 2021 (18:09 UTC), 10 km deep.

USGS: 3 km W of Fuig, Puerto Rico

35 km (22 mi) W of Ponce, PR · 31 km (19 mi) SE of Mayagüez, PR

2:09 pm AST, Aug 6, 2021 · · 10 km deep · released about 630 lb of TNT

Every earthquake near Fuig Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Guánica Municipio 5 kmLajas Municipio 9 kmSabana Grande Municipio 11 kmYauco Municipio 15 kmSan Germán Municipio 16 kmGuayanilla Municipio 16 kmMaricao Municipio 21 kmPeñuelas Municipio 24 kmHormigueros 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
2:09 pm AST on 6 August 2021 ()
Where
4 km (2 mi) west of Fuig, PR · earthquakes near Fuig
Magnitude
M 2.9 (md)
Depth
10 km below the surface
Felt
no reports yet
Nearest
Guánica Municipio, 5 km SE
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 1923 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 29 km (18 mi) from the epicentre. In Fuig, 4 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: Yauco 12 km, intensity III · San Germán 15 km, intensity II · Guayanilla 17 km, intensity II · Magas Arriba 20 km, intensity II · Pole Ojea 25 km, intensity II · Tallaboa 25 km, intensity II · Puerto Real 27 km, intensity II · Tallaboa Alta 27 km, intensity II. Estimated for each town centre; each link is that town's own record.

How big was it?

This earthquake released about 630 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 3.9 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 24,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 17,000× the energy of this one
  3. Around the size people start to feel M 3.0 1.5× the energy of this one
  4. This earthquake M 2.9 about 630 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 190,000 times the energy of this one.

Before 2016, the USGS record lists 3 earthquakes of M5 or more within 50 km:

  1. 5.8 4 km E of Moca, Puerto Rico · 48 km NNW of this epicentre
  2. 5.2 19 km SW of Stella, Puerto Rico · 50 km WNW of this epicentre
  3. 5.1 21 km SW of Stella, Puerto Rico · 49 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 17.9863, -66.9511. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection from the epicentre
Guánica Municipio, PR 5 km (3 mi) SE earthquakes near Guánica Municipio
Lajas Municipio, PR 9 km (6 mi) W earthquakes near Lajas Municipio
Sabana Grande Municipio, PR 11 km (7 mi) N earthquakes near Sabana Grande Municipio
Yauco Municipio, PR 15 km (9 mi) NE earthquakes near Yauco Municipio
San Germán Municipio, PR 16 km (10 mi) NW earthquakes near San Germán Municipio
Guayanilla Municipio, PR 16 km (10 mi) E earthquakes near Guayanilla Municipio

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

Aftershocks so far

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

  1. 3.0 11 km SSE of Guánica, Puerto Rico
  2. 3.0 14 km S of Guánica, Puerto Rico
  3. 4.1 13 km S of Guánica, Puerto Rico
  4. 2.6 3 km W of Fuig, Puerto Rico
  5. 2.1 6 km E of Mayagüez, Puerto Rico
  6. 2.9 2 km N of Guayanilla, Puerto Rico
  7. 2.5 1 km NNW of Guayanilla, Puerto Rico
  8. 2.7 2 km E of Pole Ojea, Puerto Rico
  9. 2.7 8 km SSE of Maria Antonia, Puerto Rico
  10. 2.6 3 km SSE of Pole Ojea, Puerto Rico
  11. 2.6 1 km NW of Indios, Puerto Rico
  12. 3.1 12 km SSE of Guánica, Puerto Rico
  13. 2.8 19 km S of Guánica, Puerto Rico
  14. 3.2 20 km SSE of Maria Antonia, Puerto Rico
  15. 1.9 6 km ENE of La Parguera, 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.