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 6:02 am AST (10:02 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 32 km (20 mi) north of San Juan, PR, at 3:04 am AST on 5 July 2022 (07:04 UTC), 38 km deep. 1 person has reported feeling it to USGS.

USGS: 32 km N of San Juan, Puerto Rico

40 km (25 mi) NNW of San Juan, PR

3:04 am AST, Jul 5, 2022 · · 38 km deep · released about 1,300 lb of TNT

Every earthquake near San Juan Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Toa Baja Municipio 34 kmDorado Municipio 34 kmCataño Municipio 35 kmSan Juan Municipio 38 kmLoíza Municipio 40 kmVega Alta Municipio 41 kmVega Baja Municipio 43 kmCarolina Municipio 44 kmToa Alta Municipio 45 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
3:04 am AST on 5 July 2022 ()
Where
32 km (20 mi) north of San Juan, PR · earthquakes near San Juan
Magnitude
M 3.1 (md)
Depth
38 km below the surface
Felt
1 report · strongest reported intensity II
Nearest
Toa Baja Municipio, 34 km S
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 1555 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 16 km (10 mi) from the epicentre. In San Juan, 32 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 1,300 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 6.7 270,000× the energy of this one
  2. Mineral, Virginia 2011 M 5.8 12,000× the energy of this one
  3. Magna, Utah 2020 M 5.7 8,500× the energy of this one
  4. This earthquake M 3.1 about 1,300 lb of TNT
  5. Around the size people start to feel M 3.0 this one released 1.3× 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 since 2016 was M 4.8 on 2017-08-18 — about 380 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 · 50 km WSW of this epicentre
  2. 5.5 64 km N of Tierras Nuevas Poniente, Puerto Rico · 48 km NW of this epicentre
  3. 5.1 66 km N of Brenas, Puerto Rico · 42 km NW of this epicentre
  4. 5.0 3 km N of Brenas, Puerto Rico · 35 km SW 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 18.7558, -66.1395. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection from the epicentre
Toa Baja Municipio, PR 34 km (21 mi) S earthquakes near Toa Baja Municipio
Dorado Municipio, PR 34 km (21 mi) SSW earthquakes near Dorado Municipio
Cataño Municipio, PR 35 km (22 mi) S earthquakes near Cataño Municipio
San Juan Municipio, PR 38 km (24 mi) SSE earthquakes near San Juan Municipio
Loíza Municipio, PR 40 km (25 mi) SSE earthquakes near Loíza Municipio
Vega Alta Municipio, PR 41 km (26 mi) SSW earthquakes near Vega Alta Municipio

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

Aftershocks so far

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

  1. 3.3 66 km N of Brenas, Puerto Rico
  2. 3.0 73 km N of San Juan, Puerto Rico
  3. 3.4 49 km N of Tierras Nuevas Poniente, Puerto Rico
  4. 3.0 11 km NNW of Brenas, Puerto Rico
  5. 2.8 36 km NNE of Arecibo, Puerto Rico
  6. 2.8 5 km NNW of Dorado, Puerto Rico
  7. 3.4 75 km N of Brenas, Puerto Rico
  8. 3.6 1 km NNW of San José, Puerto Rico
  9. 3.8 5 km ENE of San Juan, Puerto Rico
  10. 3.3 72 km N of Brenas, Puerto Rico
  11. 3.2 2 km ESE of Mucarabones, Puerto Rico
  12. 3.2 17 km N of Tierras Nuevas Poniente, Puerto Rico
  13. 3.0 4 km NNW of Vega Baja, Puerto Rico
  14. 3.2 71 km N of Brenas, Puerto Rico
  15. 3.2 3 km ENE of Guaynabo, 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.