QuakeIndex

Earthquake · reviewed by a seismologist

M 1.7md

Earthquake near Palmarejo, PR

No earthquake was likely felt in Palmarejo in the 24 hours to 9:10 pm AST (01:10 UTC). The last one was M 2.1, 6 km (4 mi) SW, at 11:57 pm AST on 8 November 2026, estimated intensity II (weak) in town. Every earthquake near Palmarejo

This page: a magnitude 1.7 earthquake was recorded 2 km (2 mi) southeast of Palmarejo, PR, at 8:11 pm AST on 10 January 2021 (00:11 UTC), 14 km deep.

USGS: 2 km SE of Palmarejo, Puerto Rico

21 km (13 mi) SSE of Mayagüez, PR · 113 km (70 mi) WSW of San Juan, PR

8:11 pm AST, Jan 10, 2021 · · 14 km deep · released about 10 lb of TNT

Every earthquake near Palmarejo Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Lajas Municipio 6 kmSan Germán Municipio 9 kmSabana Grande Municipio 13 kmCabo Rojo Municipio 13 kmHormigueros Municipio 13 kmGuánica Municipio 17 kmMaricao Municipio 21 kmYauco Municipio 22 kmLas Marías 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
8:11 pm AST on 10 January 2021 ()
Where
2 km (2 mi) southeast of Palmarejo, PR · earthquakes near Palmarejo
Magnitude
M 1.7 (md)
Depth
14 km below the surface
Felt
no reports yet
Nearest
Lajas Municipio, 6 km SSE
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 2037 days ago

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

At this magnitude and depth it was probably too small to be felt, even directly above it. In Palmarejo, 2 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.

Earthquakes near other towns within 30 km: Lajas, La Parguera, San Germán, Sabana Eneas, Monte Grande, Cabo Rojo.

How big was it?

This earthquake released about 10 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 2.7 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 1,500,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 1,000,000× the energy of this one
  3. Around the size people start to feel M 3.0 92× the energy of this one
  4. This earthquake M 1.7 about 10 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 12,000,000 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 · 49 km NNW of this epicentre
  2. 5.8 4 km E of Moca, Puerto Rico · 41 km N of this epicentre
  3. 5.2 19 km SW of Stella, Puerto Rico · 38 km WNW of this epicentre
  4. 5.1 21 km SW of Stella, Puerto Rico · 37 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 18.0270, -67.0581. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection from the epicentre
Lajas Municipio, PR 6 km (4 mi) SSE earthquakes near Lajas Municipio
San Germán Municipio, PR 9 km (6 mi) NNE earthquakes near San Germán Municipio
Sabana Grande Municipio, PR 13 km (8 mi) ENE earthquakes near Sabana Grande Municipio
Cabo Rojo Municipio, PR 13 km (8 mi) WSW earthquakes near Cabo Rojo Municipio
Hormigueros Municipio, PR 13 km (8 mi) NNW earthquakes near Hormigueros Municipio
Guánica Municipio, PR 17 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

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

  1. 2.2 0 km SW of Magas Arriba, Puerto Rico
  2. 2.9 Puerto Rico region
  3. 2.2 3 km SE of Maria Antonia, Puerto Rico
  4. 2.6 1 km WSW of Magas Arriba, Puerto Rico
  5. 2.4 5 km WSW of Guánica, Puerto Rico
  6. 2.7 9 km SSE of Maria Antonia, Puerto Rico
  7. 1.9 4 km SE of La Parguera, Puerto Rico
  8. 2.7 7 km SE of Maria Antonia, Puerto Rico
  9. 1.9 17 km S of Guánica, Puerto Rico
  10. 1.6 6 km SSE of Maria Antonia, Puerto Rico
  11. 3.0 7 km SE of Maria Antonia, Puerto Rico
  12. 2.7 6 km SSW of Guánica, Puerto Rico
  13. 2.1 2 km ENE of Magas Arriba, Puerto Rico
  14. 2.9 5 km SE of Maria Antonia, Puerto Rico
  15. 2.3 3 km S of Magas Arriba, 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.