QuakeIndex

Earthquake · reviewed by a seismologist

M 2.0md

Earthquake near San Juan, PR

No earthquake was likely felt in San Juan in the 24 hours to 4:09 am AST (08:09 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 2.0 earthquake was recorded 39 km (24 mi) southwest of San Juan, PR, at 3:25 pm AST on 23 July 2021 (19:25 UTC), 40 km deep.

USGS: 2 km NNW of Orocovis, Puerto Rico

40 km (25 mi) WSW of San Juan, PR · 29 km (18 mi) WSW of Bayamón, PR

3:25 pm AST, Jul 23, 2021 · · 40 km deep · released about 35 lb of TNT

Every earthquake near San Juan Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Orocovis Municipio 5 kmMorovis Municipio 8 kmCorozal Municipio 10 kmBarranquitas Municipio 11 kmCiales Municipio 13 kmVillalba Municipio 15 kmNaranjito Municipio 16 kmCoamo Municipio 17 kmComerío 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
3:25 pm AST on 23 July 2021 ()
Where
39 km (24 mi) southwest of San Juan, PR · earthquakes near San Juan
Magnitude
M 2.0 (md)
Depth
40 km below the surface
Felt
no reports yet
Nearest
Orocovis Municipio, 5 km SW
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 1938 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 San Juan, 39 km away, the estimate is intensity I (not felt). 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: Morovis, Franquez, Ciales, Barahona, Barranquitas, Corozal.

How big was it?

This earthquake released about 35 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 3.0 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 440,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 310,000× the energy of this one
  3. Around the size people start to feel M 3.0 28× the energy of this one
  4. This earthquake M 2.0 about 35 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 5.6 on 2020-01-07 — about 220,000 times the energy of this one.

Before 2016, the USGS record lists 3 earthquakes of M5 or more within 50 km:

  1. 5.8 12 km N of Garrochales, Puerto Rico · 39 km NNW of this epicentre
  2. 5.1 3 km W of Aguas Buenas, Puerto Rico · 28 km E of this epicentre
  3. 5.0 3 km N of Brenas, Puerto Rico · 29 km NNE 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 18.2506, -66.4010. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection from the epicentre
Orocovis Municipio, PR 5 km (3 mi) SW earthquakes near Orocovis Municipio
Morovis Municipio, PR 8 km (5 mi) NNW earthquakes near Morovis Municipio
Corozal Municipio, PR 10 km (6 mi) NE earthquakes near Corozal Municipio
Barranquitas Municipio, PR 11 km (7 mi) ESE earthquakes near Barranquitas Municipio
Ciales Municipio, PR 13 km (8 mi) WNW earthquakes near Ciales Municipio
Villalba Municipio, PR 15 km (10 mi) SSW earthquakes near Villalba Municipio

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

Aftershocks so far

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

  1. 3.1 3 km SE of Tallaboa Alta, Puerto Rico
  2. 3.0 5 km ESE of Cataño, Puerto Rico
  3. 2.9 1 km SE of Capitanejo, Puerto Rico
  4. 2.4 2 km SSE of Capitanejo, Puerto Rico
  5. 2.7 3 km WSW of Tallaboa, Puerto Rico
  6. 1.7 6 km SSE of Tallaboa, Puerto Rico
  7. 2.7 0 km SW of Magas Arriba, Puerto Rico
  8. 3.1 4 km NE of Yauco, Puerto Rico
  9. 2.4 1 km WNW of Guayanilla, Puerto Rico
  10. 3.5 14 km NNW of Brenas, Puerto Rico
  11. 2.8 1 km NW of Cidra, Puerto Rico
  12. 3.5 22 km NNE of Tierras Nuevas Poniente, 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.