QuakeIndex

Earthquake · reviewed by a seismologist

M 2.8md

4 km WNW of San Juan, Puerto Rico

· 81 km deep · released about 550 lb of TNT

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10 km30 km60 km120 km N Cataño Municipio 4 kmToa Baja Municipio 6 kmSan Juan Municipio 10 kmDorado Municipio 13 kmBayamón Municipio 15 kmGuaynabo Municipio 15 kmToa Alta Municipio 17 kmCarolina Municipio 21 kmVega Alta Municipio 21 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 2.8 (md)
Depth
81 km below the surface
Felt
no reports yet
Nearest
Cataño Municipio, 4 km S
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 3398 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 550 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 3.8 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 28,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 19,000× the energy of this one
  3. Around the size people start to feel M 3.0 1.7× the energy of this one
  4. This earthquake M 2.8 about 550 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 18.4793, -66.1428. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Cataño Municipio, PR 4 km (2 mi) N of here earthquakes near Cataño Municipio
Toa Baja Municipio, PR 6 km (4 mi) ENE of here earthquakes near Toa Baja Municipio
San Juan Municipio, PR 10 km (6 mi) NW of here earthquakes near San Juan Municipio
Dorado Municipio, PR 13 km (8 mi) E of here earthquakes near Dorado Municipio
Bayamón Municipio, PR 15 km (9 mi) N of here earthquakes near Bayamón Municipio
Guaynabo Municipio, PR 15 km (10 mi) NNW of here earthquakes near Guaynabo Municipio

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

Aftershocks so far

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

  1. 3.0 1 km SE of Corozal, Puerto Rico
  2. 2.8 15 km N of Brenas, Puerto Rico
  3. 2.8 32 km N of Tierras Nuevas Poniente, Puerto Rico
  4. 2.7 26 km N of Tierras Nuevas Poniente, Puerto Rico
  5. 2.9 24 km N of Brenas, Puerto Rico
  6. 2.7 6 km SSW of Corozal, Puerto Rico
  7. 3.1 5 km NE of Orocovis, Puerto Rico
  8. 2.4 2 km W of Aibonito, Puerto Rico
  9. 2.5 18 km NNE of Playa Fortuna, Puerto Rico
  10. 3.0 6 km NW of Palomas, Puerto Rico
  11. 2.9 2 km NNE of Franquez, Puerto Rico
  12. 2.7 7 km NW of Sumidero, Puerto Rico
  13. 2.8 7 km N of Tierras Nuevas Poniente, Puerto Rico
  14. 2.7 30 km N of Loíza, Puerto Rico
  15. 2.6 1 km N of Pueblito del Rio, 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.