QuakeIndex

Earthquake · reviewed by a seismologist

M 2.7md

28 km N of San Juan, Puerto Rico

· 54 km deep · released about 340 lb of TNT

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10 km30 km60 km120 km N Toa Baja Municipio 30 kmDorado Municipio 30 kmCataño Municipio 31 kmSan Juan Municipio 35 kmLoíza Municipio 38 kmVega Alta Municipio 38 kmVega Baja Municipio 40 kmCarolina Municipio 41 kmToa Alta Municipio 41 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
Magnitude
M 2.7 (md)
Depth
54 km below the surface
Felt
no reports yet
Nearest
Toa Baja Municipio, 30 km S
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 2836 days ago

This was a small earthquake. Shaking like this is often felt indoors nearby and very rarely causes damage.

How big was it?

This earthquake released about 340 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 45,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 32,000× the energy of this one
  3. Around the size people start to feel M 3.0 2.8× the energy of this one
  4. This earthquake M 2.7 about 340 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 18.7250, -66.1463. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Toa Baja Municipio, PR 30 km (19 mi) N of here earthquakes near Toa Baja Municipio
Dorado Municipio, PR 30 km (19 mi) NNE of here earthquakes near Dorado Municipio
Cataño Municipio, PR 31 km (19 mi) N of here earthquakes near Cataño Municipio
San Juan Municipio, PR 35 km (22 mi) NNW of here earthquakes near San Juan Municipio
Loíza Municipio, PR 38 km (23 mi) NW of here earthquakes near Loíza Municipio
Vega Alta Municipio, PR 38 km (24 mi) NNE of here earthquakes near Vega Alta Municipio

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

Aftershocks so far

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

  1. 2.2 26 km N of Dorado, Puerto Rico
  2. 2.5 31 km N of Brenas, Puerto Rico
  3. 3.0 36 km N of Suárez, Puerto Rico
  4. 2.6 37 km N of Tierras Nuevas Poniente, Puerto Rico
  5. 2.5 70 km N of San Juan, Puerto Rico
  6. 2.3 Puerto Rico region
  7. 1.9 24 km NNE of Tierras Nuevas Poniente, Puerto Rico
  8. 2.6 8 km NNW of Tierras Nuevas Poniente, Puerto Rico
  9. 2.5 31 km NNE of San Juan, Puerto Rico
  10. 1.7 50 km N of San Juan, Puerto Rico
  11. 2.0 52 km N of Loíza, Puerto Rico
  12. 2.4 24 km N of Dorado, Puerto Rico
  13. 2.0 18 km N of Garrochales, Puerto Rico
  14. 2.7 2 km SW of H. Rivera Colon, Puerto Rico
  15. 2.0 20 km NE 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.

For this area

The largest earthquake within 50 km in our catalogue was M 4.8 on 2017-08-18 — it released about 1,400 times the energy of this one.

From the QuakeIndex catalogue, built from the USGS FDSN event service.

On USGS

QuakeIndex does not issue warnings. For earthquake early warning see ShakeAlert.