QuakeIndex

Earthquake · reviewed by a seismologist

M 3.4md

Earthquake near San Juan, PR

No earthquake was likely felt in San Juan in the 24 hours to 11:35 pm AST (03:35 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 3.4 earthquake was recorded 47 km (29 mi) east-northeast of San Juan, PR, at 8:44 am AST on 27 November 2022 (12:44 UTC), 73 km deep. 1 person has reported feeling it to USGS.

USGS: 30 km NNE of Vieques, Puerto Rico

47 km (29 mi) NE of San Juan, PR · 40 km (25 mi) NE of Carolina, PR

8:44 am AST, Nov 27, 2022 · · 73 km deep · released about 2.1 tons of TNT

Every earthquake near San Juan Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Loíza Municipio 35 kmRío Grande Municipio 35 kmLuquillo Municipio 35 kmFajardo Municipio 36 kmCarolina Municipio 41 kmCanóvanas Municipio 43 kmSan Juan Municipio 46 kmTrujillo Alto Municipio 49 kmCeiba Municipio 49 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
8:44 am AST on 27 November 2022 ()
Where
47 km (29 mi) east-northeast of San Juan, PR · earthquakes near San Juan
Magnitude
M 3.4 (md)
Depth
73 km below the surface
Felt
1 report · strongest reported intensity IV
Nearest
Loíza Municipio, 35 km SW
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 1375 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, 47 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 2.1 tons of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 4.4 would have released about 32 times as much.

  1. Northridge, California 1994 M 6.7 80,000× the energy of this one
  2. Mineral, Virginia 2011 M 5.8 3,600× the energy of this one
  3. Magna, Utah 2020 M 5.7 2,500× the energy of this one
  4. This earthquake M 3.4 about 2.1 tons of TNT
  5. Around the size people start to feel M 3.0 this one released 4.4× 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 2021-03-09 — about 110 times the energy of this one.

Before 2016, the USGS record lists one earthquake of M5 or more within 50 km:

  1. 5.0 73 km NNE of Vieques, Puerto Rico · 43 km NE 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 18.6853, -65.7290. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection from the epicentre
Loíza Municipio, PR 35 km (22 mi) SW earthquakes near Loíza Municipio
Río Grande Municipio, PR 35 km (22 mi) SSW earthquakes near Río Grande Municipio
Luquillo Municipio, PR 35 km (22 mi) S earthquakes near Luquillo Municipio
Fajardo Municipio, PR 36 km (23 mi) SSE earthquakes near Fajardo Municipio
Carolina Municipio, PR 41 km (25 mi) SW earthquakes near Carolina Municipio
Canóvanas Municipio, PR 43 km (27 mi) SSW earthquakes near Canóvanas Municipio

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

Aftershocks so far

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

  1. 3.4 79 km NNE of Vieques, Puerto Rico
  2. 3.2 63 km NNE of San Juan, Puerto Rico
  3. 3.1 6 km ENE of San Juan, Puerto Rico
  4. 3.4 Puerto Rico region
  5. 3.3 49 km N of San Juan, Puerto Rico
  6. 3.2 Puerto Rico region
  7. 3.4 3 km NNE of Benitez, Puerto Rico
  8. 2.8 0 km SSW of San Juan, Puerto Rico
  9. 3.1 68 km NNE of Suárez, Puerto Rico
  10. 2.7 2 km WNW of Campo Rico, Puerto Rico
  11. 2.8 45 km N of San Juan, Puerto Rico
  12. 2.8 1 km W of San Isidro, Puerto Rico
  13. 2.9 49 km NE of Luquillo, Puerto Rico
  14. 3.2 3 km NNW of San Juan, Puerto Rico
  15. 3.4 Puerto Rico region

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.