QuakeIndex

Earthquake · reviewed by a seismologist

M 1.6md

Earthquake near Boquerón, PR

No earthquake was likely felt in Boquerón in the 24 hours to 4:16 pm AST (20:16 UTC). The last one was M 2.1, 6 km (4 mi) ESE, at 11:57 pm AST on 8 November 2026, estimated intensity II (weak) in town. Every earthquake near Boquerón

This page: a magnitude 1.6 earthquake was recorded 5 km (3 mi) east of Boquerón, PR, at 3:56 am AST on 3 January 2021 (07:56 UTC), 6.0 km deep.

USGS: 4 km E of Boquerón, Puerto Rico

20 km (12 mi) S of Mayagüez, PR · 120 km (75 mi) WSW of San Juan, PR

3:56 am AST, Jan 3, 2021 · · 6.0 km deep · released about 8.7 lb of TNT

Every earthquake near Boquerón Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Cabo Rojo Municipio 7 kmLajas Municipio 10 kmHormigueros Municipio 12 kmSan Germán Municipio 13 kmSabana Grande Municipio 20 kmGuánica Municipio 23 kmMaricao Municipio 26 kmLas Marías Municipio 28 kmYauco Municipio 29 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
3:56 am AST on 3 January 2021 ()
Where
5 km (3 mi) east of Boquerón, PR · earthquakes near Boquerón
Magnitude
M 1.6 (md)
Depth
6.0 km below the surface
Felt
no reports yet
Nearest
Cabo Rojo Municipio, 7 km WSW
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 2095 days ago

This was a minor earthquake. Quakes this small are rarely felt and do not cause damage.

At this magnitude and depth, people at rest would likely notice it out to about 10 km (6 mi) from the epicentre. In Boquerón, 5 km away, the estimate is intensity II (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: Pole Ojea 8 km, intensity II · Puerto Real 9 km, intensity II. Estimated for each town centre; each link is that town's own record.

How big was it?

This earthquake released about 8.7 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 2.6 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 1,700,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 1,200,000× the energy of this one
  3. Around the size people start to feel M 3.0 110× the energy of this one
  4. This earthquake M 1.6 about 8.7 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 14,000,000 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 · 47 km NNW of this epicentre
  2. 5.8 4 km E of Moca, Puerto Rico · 42 km N of this epicentre
  3. 5.2 19 km SW of Stella, Puerto Rico · 32 km NW 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 18.0233, -67.1258. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection from the epicentre
Cabo Rojo Municipio, PR 7 km (4 mi) WSW earthquakes near Cabo Rojo Municipio
Lajas Municipio, PR 10 km (6 mi) ESE earthquakes near Lajas Municipio
Hormigueros Municipio, PR 12 km (8 mi) N earthquakes near Hormigueros Municipio
San Germán Municipio, PR 13 km (8 mi) NE earthquakes near San Germán Municipio
Sabana Grande Municipio, PR 20 km (12 mi) ENE earthquakes near Sabana Grande Municipio
Guánica Municipio, PR 23 km (14 mi) ESE earthquakes near Guánica 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. 1.8 3 km SSW of Guánica, Puerto Rico
  2. 2.0 3 km SSE of Palomas, Puerto Rico
  3. 2.6 5 km SE of Maria Antonia, Puerto Rico
  4. 2.2 4 km SE of La Parguera, Puerto Rico
  5. 1.9 2 km SW of Guánica, Puerto Rico
  6. 2.4 3 km SSW of La Parguera, Puerto Rico
  7. 1.6 5 km SW of La Parguera, Puerto Rico
  8. 2.0 5 km SE of Maria Antonia, Puerto Rico
  9. 2.1 Puerto Rico region
  10. 2.5 1 km SW of Fuig, Puerto Rico
  11. 2.3 4 km ESE of La Parguera, Puerto Rico
  12. 1.6 6 km WSW of Fuig, Puerto Rico
  13. 1.6 2 km SW of Lluveras, Puerto Rico
  14. 1.6 4 km SSE of La Parguera, Puerto Rico
  15. 2.4 4 km SSW of Indios, 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.