QuakeIndex

Earthquake · reviewed by a seismologist

M 2.6md

Earthquake near San Juan, PR

No earthquake was likely felt in San Juan in the 24 hours to 7:07 am AST (11:07 UTC). The last one was M 4.1, 99 km (62 mi) SE, at 5:44 am AST on 28 October 2026, estimated intensity II (weak) in town; 5 felt reports to USGS. Every earthquake near San Juan

This page: a magnitude 2.6 earthquake was recorded 43 km (27 mi) southwest of San Juan, PR, at 8:10 pm AST on 21 November 2023 (00:10 UTC), 16 km deep.

USGS: Puerto Rico region

41 km (25 mi) SW of San Juan, PR · 31 km (20 mi) SW of Bayamón, PR

8:10 pm AST, Nov 21, 2023 · · 16 km deep · released about 260 lb of TNT

Every earthquake near San Juan Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Coamo Municipio 6 kmBarranquitas Municipio 6 kmAibonito Municipio 9 kmOrocovis Municipio 11 kmVillalba Municipio 13 kmComerío Municipio 16 kmCorozal Municipio 16 kmNaranjito Municipio 18 kmMorovis Municipio 19 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
8:10 pm AST on 21 November 2023 ()
Where
43 km (27 mi) southwest of San Juan, PR · earthquakes near San Juan
Magnitude
M 2.6 (md)
Depth
16 km below the surface
Felt
no reports yet
Nearest
Coamo Municipio, 6 km S
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 1086 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 18 km (11 mi) from the epicentre. In San Juan, 43 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: Coamo 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 260 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 59,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 42,000× the energy of this one
  3. Around the size people start to feel M 3.0 3.7× the energy of this one
  4. This earthquake M 2.6 about 260 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 in our catalogue was M 5.6 on 2020-01-07 — about 30,000 times the energy of this one.

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 18.1590, -66.3492. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection from the epicentre
Coamo Municipio, PR 6 km (4 mi) S earthquakes near Coamo Municipio
Barranquitas Municipio, PR 6 km (4 mi) NE earthquakes near Barranquitas Municipio
Aibonito Municipio, PR 9 km (6 mi) ESE earthquakes near Aibonito Municipio
Orocovis Municipio, PR 11 km (7 mi) NW earthquakes near Orocovis Municipio
Villalba Municipio, PR 13 km (8 mi) WSW earthquakes near Villalba Municipio
Comerío Municipio, PR 16 km (10 mi) ENE earthquakes near Comerío Municipio

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

Aftershocks so far

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

  1. 2.1 4 km ENE of Bayamon, Puerto Rico
  2. 2.2 5 km SSW of Arroyo, Puerto Rico
  3. 3.1 2 km SSE of Magas Arriba, Puerto Rico
  4. 2.4 4 km ENE of Bayamon, Puerto Rico
  5. 2.4 3 km NNE of Guayanilla, Puerto Rico
  6. 2.3 9 km NNW of Coto Laurel, Puerto Rico
  7. 3.5 0 km SSW of Bayamón, Puerto Rico
  8. 2.7 4 km S of Adjuntas, Puerto Rico
  9. 2.6 1 km NNE of Guayanilla, Puerto Rico
  10. 2.5 7 km ESE of Naranjito, Puerto Rico
  11. 2.1 Puerto Rico region
  12. 2.2 5 km SSE of Salinas, Puerto Rico
  13. 2.4 Puerto Rico region
  14. 2.4 6 km SSE of Salinas, Puerto Rico
  15. 2.6 6 km SSE of Salinas, 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.