QuakeIndex

Earthquake · reviewed by a seismologist

M 2.1md

Earthquake near Adjuntas, PR

No earthquake was likely felt in Adjuntas in the 24 hours to 11:45 am AST (15:45 UTC). The last one was M 3.0, 31 km (19 mi) SSW, at 3:45 am AST on 8 November 2026, estimated intensity II (weak) in town. Every earthquake near Adjuntas

This page: a magnitude 2.1 earthquake was recorded 6 km (4 mi) southwest of Adjuntas, PR, at 5:19 am AST on 21 April 2026 (09:19 UTC), 22 km deep.

USGS: 6 km SW of Adjuntas, Puerto Rico

20 km (13 mi) NW of Ponce, PR

5:19 am AST, Apr 21, 2026 · · 22 km deep · released about 43 lb of TNT

Every earthquake near Adjuntas Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Adjuntas Municipio 6 kmYauco Municipio 11 kmPeñuelas Municipio 11 kmGuayanilla Municipio 14 kmUtuado Municipio 18 kmMaricao Municipio 19 kmSabana Grande Municipio 20 kmLares Municipio 20 kmJayuya Municipio 21 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
5:19 am AST on 21 April 2026 ()
Where
6 km (4 mi) southwest of Adjuntas, PR · earthquakes near Adjuntas
Magnitude
M 2.1 (md)
Depth
22 km below the surface
Felt
no reports yet
Nearest
Adjuntas Municipio, 6 km N
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 204 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 Adjuntas, 6 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: Santo Domingo, Peñuelas, Tallaboa Alta, Magas Arriba, Guayanilla, Yauco.

How big was it?

This earthquake released about 43 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 5.8 350,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 250,000× the energy of this one
  3. Around the size people start to feel M 3.0 22× the energy of this one
  4. This earthquake M 2.1 about 43 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 2,800,000 times the energy of this one.

Before 2016, the USGS record lists one earthquake of M5 or more within 50 km:

  1. 5.8 4 km E of Moca, Puerto Rico · 45 km NW 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 18.1238, -66.7633. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection from the epicentre
Adjuntas Municipio, PR 6 km (4 mi) N earthquakes near Adjuntas Municipio
Yauco Municipio, PR 11 km (7 mi) WSW earthquakes near Yauco Municipio
Peñuelas Municipio, PR 11 km (7 mi) SSE earthquakes near Peñuelas Municipio
Guayanilla Municipio, PR 14 km (9 mi) SSW earthquakes near Guayanilla Municipio
Utuado Municipio, PR 18 km (11 mi) NNE earthquakes near Utuado Municipio
Maricao Municipio, PR 19 km (12 mi) WNW earthquakes near Maricao Municipio

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

Aftershocks so far

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

  1. 1.6 8 km NW of Adjuntas, Puerto Rico
  2. 2.4 4 km SSW of Indios, Puerto Rico
  3. 2.7 5 km SE of Lares, Puerto Rico
  4. 2.4 8 km S of Guánica, Puerto Rico
  5. 2.6 3 km E of Boquerón, Puerto Rico
  6. 2.4 5 km SSE of Indios, Puerto Rico
  7. 2.7 2 km NW of Tallaboa, Puerto Rico
  8. 3.1 2 km ESE of Boquerón, Puerto Rico
  9. 2.4 8 km SW of Guánica, Puerto Rico
  10. 2.1 7 km SSE of Maria Antonia, Puerto Rico
  11. 2.3 4 km SE of Maria Antonia, Puerto Rico
  12. 2.4 1 km NE of Indios, Puerto Rico
  13. 2.2 4 km SSW of Indios, Puerto Rico
  14. 3.5 5 km WNW of Mayagüez, Puerto Rico
  15. 2.0 6 km ENE of Adjuntas, 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.