QuakeIndex

Earthquake · reviewed by a seismologist

M 2.6md

Earthquake near Palmarejo, PR

No earthquake was likely felt in Palmarejo in the 24 hours to 5:50 pm AST (21:50 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 2.6 earthquake was recorded 3 km (2 mi) southeast of Palmarejo, PR, at 7:18 pm AST on 21 July 2023 (23:18 UTC), 7.7 km deep.

USGS: 2 km SE of Palmarejo, Puerto Rico

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

7:18 pm AST, Jul 21, 2023 · · 7.7 km deep · released about 220 lb of TNT

Every earthquake near Palmarejo Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Lajas Municipio 5 kmSan Germán Municipio 10 kmCabo Rojo Municipio 13 kmSabana Grande Municipio 14 kmHormigueros Municipio 14 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
7:18 pm AST on 21 July 2023 ()
Where
3 km (2 mi) southeast of Palmarejo, PR · earthquakes near Palmarejo
Magnitude
M 2.6 (md)
Depth
7.7 km below the surface
Felt
no reports yet
Nearest
Lajas Municipio, 5 km SSE
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 1209 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 22 km (14 mi) from the epicentre. In Palmarejo, 3 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 7 km, intensity III · Pole Ojea 14 km, intensity II · Puerto Real 15 km, intensity II · Mayagüez 22 km, intensity II · Yauco 22 km, intensity II. Estimated for each town centre; each link is that town's own record.

How big was it?

This earthquake released about 220 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 3.6 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 70,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 50,000× the energy of this one
  3. Around the size people start to feel M 3.0 4.4× the energy of this one
  4. This earthquake M 2.6 about 220 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 560,000 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 · 42 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 18.0225, -67.0592. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection from the epicentre
Lajas Municipio, PR 5 km (3 mi) SSE earthquakes near Lajas Municipio
San Germán Municipio, PR 10 km (6 mi) NNE earthquakes near San Germán Municipio
Cabo Rojo Municipio, PR 13 km (8 mi) WSW earthquakes near Cabo Rojo Municipio
Sabana Grande Municipio, PR 14 km (8 mi) ENE earthquakes near Sabana Grande Municipio
Hormigueros Municipio, PR 14 km (9 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

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

  1. 2.5 Puerto Rico region
  2. 2.0 7 km SSE of Guánica, Puerto Rico
  3. 2.5 Puerto Rico region
  4. 1.8 7 km ESE of Pole Ojea, Puerto Rico
  5. 2.5 6 km E of Espino, Puerto Rico
  6. 2.4 8 km WSW of La Parguera, Puerto Rico
  7. 3.0 Puerto Rico region
  8. 2.2 3 km SSW of Indios, Puerto Rico
  9. 2.2 4 km NE of La Parguera, Puerto Rico
  10. 2.3 2 km NNW of Indios, Puerto Rico
  11. 2.8 5 km SW of Liborio Negron Torres, Puerto Rico
  12. 2.4 5 km WSW of Liborio Negron Torres, Puerto Rico
  13. 2.5 4 km WSW of Fuig, Puerto Rico
  14. 2.5 2 km E of Yauco, Puerto Rico
  15. 2.3 7 km WSW 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.