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 7:46 am AST (11:46 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 32 km (20 mi) southwest of San Juan, PR, at 9:37 am AST on 9 February 2023 (13:37 UTC), 25 km deep.

USGS: Puerto Rico region

31 km (19 mi) WSW of San Juan, PR · 21 km (13 mi) SW of Bayamón, PR

9:37 am AST, Feb 9, 2023 · · 25 km deep · released about 310 lb of TNT

Every earthquake near San Juan Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Corozal Municipio 4 kmNaranjito Municipio 8 kmBarranquitas Municipio 8 kmMorovis Municipio 12 kmComerío Municipio 12 kmToa Alta Municipio 13 kmOrocovis Municipio 13 kmAibonito Municipio 17 kmBayamón Municipio 18 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
9:37 am AST on 9 February 2023 ()
Where
32 km (20 mi) southwest of San Juan, PR · earthquakes near San Juan
Magnitude
M 2.7 (md)
Depth
25 km below the surface
Felt
no reports yet
Nearest
Corozal Municipio, 4 km N
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 1371 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, 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.

Earthquakes near other towns within 30 km: Corozal, Naranjito, Barranquitas, H. Rivera Colon, Morovis, Comerío.

How big was it?

This earthquake released about 310 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 50,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 35,000× the energy of this one
  3. Around the size people start to feel M 3.0 3.1× the energy of this one
  4. This earthquake M 2.7 about 310 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.

Where

Epicentre 18.2702, -66.3217. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection from the epicentre
Corozal Municipio, PR 4 km (2 mi) N earthquakes near Corozal Municipio
Naranjito Municipio, PR 8 km (5 mi) ENE earthquakes near Naranjito Municipio
Barranquitas Municipio, PR 8 km (5 mi) S earthquakes near Barranquitas Municipio
Morovis Municipio, PR 12 km (7 mi) WNW earthquakes near Morovis Municipio
Comerío Municipio, PR 12 km (7 mi) ESE earthquakes near Comerío Municipio
Toa Alta Municipio, PR 13 km (8 mi) NE earthquakes near Toa Alta Municipio

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

Aftershocks so far

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

  1. 2.0 1 km SSW of Vázquez, Puerto Rico
  2. 3.2 3 km NNW of San Juan, Puerto Rico
  3. 2.1 Puerto Rico region
  4. 2.2 3 km SE of Salinas, Puerto Rico
  5. 3.1 5 km N of Garrochales, Puerto Rico
  6. 1.9 2 km SSW of Coto Laurel, Puerto Rico
  7. 3.0 5 km SSW of Potala Pastillo, Puerto Rico
  8. 2.6 4 km SSE of Arroyo, Puerto Rico
  9. 2.3 4 km SSW of Potala Pastillo, Puerto Rico
  10. 2.4 5 km SSW of Potala Pastillo, Puerto Rico
  11. 3.0 4 km SSW of Potala Pastillo, Puerto Rico
  12. 2.2 2 km WSW of Aguilita, Puerto Rico
  13. 2.6 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

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