QuakeIndex

Earthquake · reviewed by a seismologist

M 2.2md

Earthquake near San Juan, PR

No earthquake was likely felt in San Juan in the 24 hours to 5:19 pm AST (21:19 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 2.2 earthquake was recorded 36 km (22 mi) north-northeast of San Juan, PR, at 4:41 pm AST on 2 December 2018 (20:41 UTC), 47 km deep.

USGS: 34 km N of Loíza, Puerto Rico

40 km (25 mi) NNE of San Juan, PR · 37 km (23 mi) N of Carolina, PR

4:41 pm AST, Dec 2, 2018 · · 47 km deep · released about 64 lb of TNT

Every earthquake near San Juan Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Loíza Municipio 33 kmSan Juan Municipio 38 kmCarolina Municipio 38 kmCataño Municipio 40 kmToa Baja Municipio 42 kmRío Grande Municipio 42 kmTrujillo Alto Municipio 46 kmCanóvanas Municipio 46 kmDorado Municipio 46 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
4:41 pm AST on 2 December 2018 ()
Where
36 km (22 mi) north-northeast of San Juan, PR · earthquakes near San Juan
Magnitude
M 2.2 (md)
Depth
47 km below the surface
Felt
no reports yet
Nearest
Loíza Municipio, 33 km S
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 2901 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, 36 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 64 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 3.2 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 230,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 170,000× the energy of this one
  3. Around the size people start to feel M 3.0 15× the energy of this one
  4. This earthquake M 2.2 about 64 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 7,400 times the energy of this one.

Before 2016, the USGS record since 1900 lists no earthquake of M5 or more within 50 km.

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 18.7383, -65.9275. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection from the epicentre
Loíza Municipio, PR 33 km (20 mi) S earthquakes near Loíza Municipio
San Juan Municipio, PR 38 km (24 mi) SSW earthquakes near San Juan Municipio
Carolina Municipio, PR 38 km (24 mi) S earthquakes near Carolina Municipio
Cataño Municipio, PR 40 km (25 mi) SW earthquakes near Cataño Municipio
Toa Baja Municipio, PR 42 km (26 mi) SW earthquakes near Toa Baja Municipio
Río Grande Municipio, PR 42 km (26 mi) SSE earthquakes near Río Grande Municipio

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

Aftershocks so far

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

  1. 2.7 68 km N of Suárez, Puerto Rico
  2. 2.0 52 km N of Loíza, Puerto Rico
  3. 2.6 68 km N of Suárez, Puerto Rico
  4. 2.4 24 km N of Dorado, Puerto Rico
  5. 2.0 20 km NE of San Juan, Puerto Rico
  6. 2.6 23 km NNE of Luquillo, Puerto Rico
  7. 3.1 37 km NNE of Vieques, Puerto Rico
  8. 2.5 6 km ESE of San Juan, Puerto Rico
  9. 2.6 24 km N of San Juan, Puerto Rico
  10. 2.9 13 km NNW of Brenas, Puerto Rico
  11. 2.1 37 km N of San Juan, Puerto Rico
  12. 2.5 12 km N of Brenas, Puerto Rico
  13. 3.0 2 km ENE of Guaynabo, Puerto Rico
  14. 2.8 71 km N of San Juan, Puerto Rico
  15. 2.6 70 km N of San Juan, 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.