QuakeIndex

Earthquake · reviewed by a seismologist

M 1.7md

Earthquake near San Juan, PR

No earthquake was likely felt in San Juan in the 24 hours to 7:20 pm AST (23:20 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 1.7 earthquake was recorded 34 km (21 mi) north of San Juan, PR, at 2:51 pm AST on 24 November 2018 (18:51 UTC), 46 km deep.

USGS: 33 km N of San Juan, Puerto Rico

41 km (25 mi) N of San Juan, PR

2:51 pm AST, Nov 24, 2018 · · 46 km deep · released about 10 lb of TNT

Every earthquake near San Juan Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Toa Baja Municipio 36 kmCataño Municipio 36 kmDorado Municipio 37 kmSan Juan Municipio 39 kmLoíza Municipio 40 kmCarolina Municipio 44 kmVega Alta Municipio 44 kmVega Baja Municipio 47 kmBayamón 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
2:51 pm AST on 24 November 2018 ()
Where
34 km (21 mi) north of San Juan, PR · earthquakes near San Juan
Magnitude
M 1.7 (md)
Depth
46 km below the surface
Felt
no reports yet
Nearest
Toa Baja Municipio, 36 km SSW
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 2909 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, 34 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.

How big was it?

This earthquake released about 10 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 2.7 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 1,500,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 1,100,000× the energy of this one
  3. Around the size people start to feel M 3.0 95× the energy of this one
  4. This earthquake M 1.7 about 10 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 48,000 times the energy of this one.

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

  1. 5.5 64 km N of Tierras Nuevas Poniente, Puerto Rico · 50 km NW of this epicentre
  2. 5.1 66 km N of Brenas, Puerto Rico · 43 km NW of this epicentre
  3. 5.0 3 km N of Brenas, Puerto Rico · 39 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 18.7695, -66.1050. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection from the epicentre
Toa Baja Municipio, PR 36 km (22 mi) SSW earthquakes near Toa Baja Municipio
Cataño Municipio, PR 36 km (23 mi) S earthquakes near Cataño Municipio
Dorado Municipio, PR 37 km (23 mi) SSW earthquakes near Dorado Municipio
San Juan Municipio, PR 39 km (24 mi) S earthquakes near San Juan Municipio
Loíza Municipio, PR 40 km (25 mi) SSE earthquakes near Loíza Municipio
Carolina Municipio, PR 44 km (27 mi) SSE earthquakes near Carolina Municipio

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

Aftershocks so far

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

  1. 2.7 73 km N of San Juan, Puerto Rico
  2. 2.8 72 km N of San Juan, Puerto Rico
  3. 1.6 19 km N of Tierras Nuevas Poniente, Puerto Rico
  4. 2.8 1 km SSW of Levittown, Puerto Rico
  5. 2.5 3 km SE of Bayamón, Puerto Rico
  6. 2.7 14 km NNW of Sabana, Puerto Rico
  7. 2.3 13 km N of Brenas, Puerto Rico
  8. 2.6 22 km NNE of San Juan, Puerto Rico
  9. 2.7 17 km N of Tierras Nuevas Poniente, Puerto Rico
  10. 2.5 13 km NW of Loíza, Puerto Rico
  11. 2.0 8 km NE of San Juan, Puerto Rico
  12. 2.9 11 km NNE of Brenas, Puerto Rico
  13. 2.8 70 km N of San Juan, Puerto Rico
  14. 2.7 28 km N of San Juan, Puerto Rico
  15. 2.6 0 km ENE of Sabana Seca, 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.