QuakeIndex

Earthquake · reviewed by a seismologist

M 3.1md

Earthquake near San Juan, PR

No earthquake was likely felt in San Juan in the 24 hours to 7:06 am AST (11:06 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 3.1 earthquake was recorded 34 km (21 mi) west-northwest of San Juan, PR, at 6:05 am AST on 15 June 2023 (10:05 UTC), 93 km deep.

USGS: Puerto Rico region

41 km (26 mi) NW of San Juan, PR · 35 km (22 mi) NW of Bayamón, PR

6:05 am AST, Jun 15, 2023 · · 93 km deep · released about 1,400 lb of TNT

Every earthquake near San Juan Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Vega Baja Municipio 19 kmDorado Municipio 21 kmVega Alta Municipio 22 kmManatí Municipio 24 kmBarceloneta Municipio 26 kmToa Baja Municipio 27 kmCataño Municipio 31 kmToa Alta Municipio 32 kmMorovis Municipio 35 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
6:05 am AST on 15 June 2023 ()
Where
34 km (21 mi) west-northwest of San Juan, PR · earthquakes near San Juan
Magnitude
M 3.1 (md)
Depth
93 km below the surface
Felt
no reports yet
Nearest
Vega Baja Municipio, 19 km S
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 1246 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 it was probably too small to be felt, even directly above it. In San Juan, 34 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: Brenas, Sabana, Ceiba, Vega Baja, Monserrate, San Antonio.

How big was it?

This earthquake released about 1,400 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 4.1 would have released about 32 times as much.

  1. Northridge, California 1994 M 6.7 230,000× the energy of this one
  2. Mineral, Virginia 2011 M 5.8 10,000× the energy of this one
  3. Magna, Utah 2020 M 5.7 7,400× the energy of this one
  4. This earthquake M 3.1 about 1,400 lb of TNT
  5. Around the size people start to feel M 3.0 this one released 1.5× more

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 4.8 on 2017-08-18 — about 330 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 18.6263, -66.3767. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection from the epicentre
Vega Baja Municipio, PR 19 km (12 mi) S earthquakes near Vega Baja Municipio
Dorado Municipio, PR 21 km (13 mi) SE earthquakes near Dorado Municipio
Vega Alta Municipio, PR 22 km (13 mi) SSE earthquakes near Vega Alta Municipio
Manatí Municipio, PR 24 km (15 mi) SSW earthquakes near Manatí Municipio
Barceloneta Municipio, PR 26 km (16 mi) SW earthquakes near Barceloneta Municipio
Toa Baja Municipio, PR 27 km (17 mi) SE earthquakes near Toa Baja Municipio

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

Aftershocks so far

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

  1. 3.0 Puerto Rico region
  2. 3.1 52 km N of Brenas, Puerto Rico
  3. 3.4 52 km N of Brenas, Puerto Rico
  4. 3.2 55 km N of Brenas, Puerto Rico
  5. 3.0 24 km NNW of Loíza, Puerto Rico
  6. 3.1 15 km NNE of Carrizales, Puerto Rico
  7. 3.8 39 km N of Carrizales, Puerto Rico
  8. 3.0 15 km N of Hatillo, Puerto Rico
  9. 3.1 15 km N of Carrizales, Puerto Rico
  10. 2.3 Puerto Rico region
  11. 3.2 2 km NNW of San Juan, Puerto Rico
  12. 3.3 4 km ENE of Guaynabo, Puerto Rico
  13. 3.3 Puerto Rico region
  14. 2.5 13 km NNE of Carrizales, Puerto Rico
  15. 2.8 5 km NNW of Brenas, 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.