QuakeIndex

Earthquake · reviewed by a seismologist

M 2.1md

Earthquake near Palmarejo, PR

No earthquake was likely felt in Palmarejo in the 24 hours to 5:52 pm AST (21:52 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 2.1 earthquake was recorded 5 km (3 mi) southwest of Palmarejo, PR, at 12:50 pm AST on 21 June 2018 (16:50 UTC), 13 km deep.

USGS: 4 km SW of Palmarejo, Puerto Rico

22 km (14 mi) S of Mayagüez, PR · 118 km (74 mi) WSW of San Juan, PR

12:50 pm AST, Jun 21, 2018 · · 13 km deep · released about 40 lb of TNT

Every earthquake near Palmarejo Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Lajas Municipio 7 kmCabo Rojo Municipio 8 kmSan Germán Municipio 13 kmHormigueros Municipio 14 kmSabana Grande Municipio 19 kmGuánica Municipio 20 kmMaricao Municipio 26 kmYauco Municipio 27 kmLas Marías Municipio 28 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
12:50 pm AST on 21 June 2018 ()
Where
5 km (3 mi) southwest of Palmarejo, PR · earthquakes near Palmarejo
Magnitude
M 2.1 (md)
Depth
13 km below the surface
Felt
no reports yet
Nearest
Lajas Municipio, 7 km ESE
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 3065 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 11 km (7 mi) from the epicentre. In Palmarejo, 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 9 km, intensity II · San Germán 10 km, intensity II. Estimated for each town centre; each link is that town's own record.

How big was it?

This earthquake released about 40 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 3.1 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 380,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 270,000× the energy of this one
  3. Around the size people start to feel M 3.0 24× the energy of this one
  4. This earthquake M 2.1 about 40 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

No earthquake of M4 or more has been recorded within 50 km since our catalogue begins in 2016.

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 · 50 km NNW of this epicentre
  2. 5.8 4 km E of Moca, Puerto Rico · 44 km N of this epicentre
  3. 5.2 19 km SW of Stella, Puerto Rico · 35 km NW of this epicentre
  4. 5.1 21 km SW of Stella, Puerto Rico · 34 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 18.0058, -67.1028. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection from the epicentre
Lajas Municipio, PR 7 km (5 mi) ESE earthquakes near Lajas Municipio
Cabo Rojo Municipio, PR 8 km (5 mi) W earthquakes near Cabo Rojo Municipio
San Germán Municipio, PR 13 km (8 mi) NNE earthquakes near San Germán Municipio
Hormigueros Municipio, PR 14 km (9 mi) N earthquakes near Hormigueros Municipio
Sabana Grande Municipio, PR 19 km (12 mi) ENE earthquakes near Sabana Grande Municipio
Guánica Municipio, PR 20 km (12 mi) ESE earthquakes near Guánica Municipio

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

Aftershocks so far

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

  1. 2.1 11 km SSE of Lares, Puerto Rico
  2. 2.0 5 km W of Mayagüez, Puerto Rico
  3. 1.7 3 km WNW of Pole Ojea, Puerto Rico
  4. 3.0 10 km SSW of Tallaboa, Puerto Rico
  5. 2.1 4 km NNE of Yauco, Puerto Rico
  6. 1.9 5 km NW of Mayagüez, Puerto Rico
  7. 2.1 19 km S of Tallaboa, Puerto Rico
  8. 2.2 18 km S of Tallaboa, Puerto Rico
  9. 2.2 19 km S of Tallaboa, Puerto Rico
  10. 1.9 9 km S of Guánica, Puerto Rico
  11. 1.5 2 km SSE of Guayanilla, Puerto Rico
  12. 2.1 3 km SW of Maricao, Puerto Rico
  13. 1.8 10 km SSE of Tallaboa, Puerto Rico
  14. 1.9 17 km SSE of Guánica, Puerto Rico
  15. 2.0 20 km SW of Stella, 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.