QuakeIndex

Earthquake · reviewed by a seismologist

M 3.0md

Earthquake near La Parguera, PR

No earthquake was likely felt in La Parguera in the 24 hours to 10:21 am AST (14:21 UTC). The last one was M 2.1, 9 km (5 mi) WNW, at 11:57 pm AST on 8 November 2026, estimated intensity II (weak) in town. Every earthquake near La Parguera

This page: a magnitude 3.0 earthquake was recorded 4 km (2 mi) north-northwest of La Parguera, PR, at 3:52 am AST on 21 July 2021 (07:52 UTC), 6.0 km deep.

USGS: 3 km NNW of La Parguera, Puerto Rico

23 km (14 mi) SSE of Mayagüez, PR · 114 km (71 mi) WSW of San Juan, PR

3:52 am AST, Jul 21, 2021 · · 6.0 km deep · released about 1,100 lb of TNT

Every earthquake near La Parguera Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Lajas Municipio 4 kmSan Germán Municipio 11 kmCabo Rojo Municipio 13 kmSabana Grande Municipio 14 kmHormigueros Municipio 15 kmGuánica Municipio 16 kmMaricao Municipio 23 kmYauco Municipio 23 kmLas Marías Municipio 26 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
3:52 am AST on 21 July 2021 ()
Where
4 km (2 mi) north-northwest of La Parguera, PR · earthquakes near La Parguera
Magnitude
M 3.0 (md)
Depth
6.0 km below the surface
Felt
no reports yet
Nearest
Lajas Municipio, 4 km SSE
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 1873 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 38 km (24 mi) from the epicentre. In La Parguera, 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: San Germán 8 km, intensity III · Pole Ojea 14 km, intensity III · Puerto Real 16 km, intensity III · Yauco 22 km, intensity II · Mayagüez 23 km, intensity II · Guayanilla 28 km, intensity II · Magas Arriba 31 km, intensity II · Tallaboa 36 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 6.7 310,000× 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 9,800× 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 3 earthquakes of M5 or more within 50 km:

  1. 5.8 4 km E of Moca, Puerto Rico · 44 km N of this epicentre
  2. 5.2 19 km SW of Stella, Puerto Rico · 39 km WNW of this epicentre
  3. 5.1 21 km SW of Stella, Puerto Rico · 38 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 18.0078, -67.0583. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection from the epicentre
Lajas Municipio, PR 4 km (2 mi) SSE earthquakes near Lajas Municipio
San Germán Municipio, PR 11 km (7 mi) NNE earthquakes near San Germán Municipio
Cabo Rojo Municipio, PR 13 km (8 mi) W earthquakes near Cabo Rojo Municipio
Sabana Grande Municipio, PR 14 km (9 mi) NE earthquakes near Sabana Grande Municipio
Hormigueros Municipio, PR 15 km (10 mi) NNW earthquakes near Hormigueros Municipio
Guánica Municipio, PR 16 km (10 mi) ESE earthquakes near Guánica 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. 2.5 6 km WSW of La Parguera, Puerto Rico
  2. 1.9 5 km SW of La Parguera, Puerto Rico
  3. 3.1 2 km SW of Guánica, Puerto Rico
  4. 2.2 12 km SSE of Maria Antonia, Puerto Rico
  5. 2.4 3 km E of La Parguera, Puerto Rico
  6. 2.7 11 km SSE of Guánica, Puerto Rico
  7. 3.1 4 km NE of Yauco, Puerto Rico
  8. 2.5 11 km SSE of Guánica, Puerto Rico
  9. 2.5 7 km SW of La Parguera, Puerto Rico
  10. 2.2 Puerto Rico region
  11. 2.4 1 km WNW of Guayanilla, Puerto Rico
  12. 1.6 5 km SSE of La Parguera, Puerto Rico
  13. 1.8 2 km ESE of Maria Antonia, Puerto Rico
  14. 3.2 1 km ENE of Lluveras, Puerto Rico
  15. 3.1 2 km SSW of Guánica, 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.