QuakeIndex

Earthquake · reviewed by a seismologist

M 2.7md

Earthquake near San Juan, PR

No earthquake was likely felt in San Juan in the 24 hours to 11:23 am AST (15:23 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 2.7 earthquake was recorded 40 km (25 mi) northwest of San Juan, PR, at 8:33 am AST on 6 July 2024 (12:33 UTC), 56 km deep.

USGS: 30 km N of Brenas, Puerto Rico

48 km (30 mi) NW of San Juan, PR · 45 km (28 mi) NNW of Bayamón, PR

8:33 am AST, Jul 6, 2024 · · 56 km deep · released about 340 lb of TNT

Every earthquake near San Juan Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Dorado Municipio 31 kmVega Baja Municipio 33 kmVega Alta Municipio 34 kmToa Baja Municipio 36 kmManatí Municipio 37 kmBarceloneta Municipio 38 kmCataño Municipio 40 kmToa Alta Municipio 44 kmSan Juan Municipio 47 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
8:33 am AST on 6 July 2024 ()
Where
40 km (25 mi) northwest of San Juan, PR · earthquakes near San Juan
Magnitude
M 2.7 (md)
Depth
56 km below the surface
Felt
no reports yet
Nearest
Dorado Municipio, 31 km SSE
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 858 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, 40 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.

How big was it?

This earthquake released about 340 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 3.7 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 45,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 32,000× the energy of this one
  3. Around the size people start to feel M 3.0 2.8× the energy of this one
  4. This earthquake M 2.7 about 340 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 4.8 on 2017-08-18 — about 1,400 times the energy of this one.

Before 2016, the USGS record lists 4 earthquakes of M5 or more within 50 km:

  1. 5.8 12 km N of Garrochales, Puerto Rico · 30 km SW of this epicentre
  2. 5.5 64 km N of Tierras Nuevas Poniente, Puerto Rico · 36 km NNW of this epicentre
  3. 5.1 66 km N of Brenas, Puerto Rico · 36 km N of this epicentre
  4. 5.0 3 km N of Brenas, Puerto Rico · 27 km S 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 18.7443, -66.3510. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection from the epicentre
Dorado Municipio, PR 31 km (20 mi) SSE earthquakes near Dorado Municipio
Vega Baja Municipio, PR 33 km (20 mi) S earthquakes near Vega Baja Municipio
Vega Alta Municipio, PR 34 km (21 mi) S earthquakes near Vega Alta Municipio
Toa Baja Municipio, PR 36 km (22 mi) SSE earthquakes near Toa Baja Municipio
Manatí Municipio, PR 37 km (23 mi) SSW earthquakes near Manatí Municipio
Barceloneta Municipio, PR 38 km (23 mi) SW earthquakes near Barceloneta Municipio

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

Aftershocks so far

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

  1. 3.0 23 km N of Tierras Nuevas Poniente, Puerto Rico
  2. 2.9 50 km N of Brenas, Puerto Rico
  3. 2.9 43 km N of Tierras Nuevas Poniente, Puerto Rico
  4. 3.3 2 km NNW of La Luisa, Puerto Rico
  5. 3.2 10 km NNW of Garrochales, Puerto Rico
  6. 2.6 17 km N of Hatillo, Puerto Rico
  7. 2.8 16 km N of Tierras Nuevas Poniente, Puerto Rico
  8. 2.9 9 km NNE of Brenas, Puerto Rico
  9. 3.2 55 km N of Tierras Nuevas Poniente, Puerto Rico
  10. 3.2 61 km N of Tierras Nuevas Poniente, Puerto Rico
  11. 2.8 47 km N of San Juan, Puerto Rico
  12. 2.6 5 km NNW of Arecibo, Puerto Rico
  13. 3.0 45 km N of San Juan, Puerto Rico
  14. 3.2 67 km N of Brenas, Puerto Rico
  15. 3.0 0 km WNW of Candelaria, 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.