QuakeIndex

Earthquake · reviewed by a seismologist

M 2.8Md

4 km NE of San Juan, Puerto Rico

· 99 km deep · released about 480 lb of TNT

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10 km30 km60 km120 km N San Juan Municipio 7 kmCataño Municipio 9 kmToa Baja Municipio 13 kmLoíza Municipio 15 kmCarolina Municipio 15 kmGuaynabo Municipio 16 kmBayamón Municipio 18 kmTrujillo Alto Municipio 18 kmDorado Municipio 20 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
99 km below the surface
Felt
no reports yet
Nearest
San Juan Municipio, 7 km S
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 3453 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 480 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 32,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 22,000× the energy of this one
  3. Around the size people start to feel M 3.0 2× the energy of this one
  4. This earthquake M 2.8 about 480 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 18.4874, -66.0739. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
San Juan Municipio, PR 7 km (5 mi) N of here earthquakes near San Juan Municipio
Cataño Municipio, PR 9 km (6 mi) ENE of here earthquakes near Cataño Municipio
Toa Baja Municipio, PR 13 km (8 mi) ENE of here earthquakes near Toa Baja Municipio
Loíza Municipio, PR 15 km (9 mi) WNW of here earthquakes near Loíza Municipio
Carolina Municipio, PR 15 km (9 mi) NW of here earthquakes near Carolina Municipio
Guaynabo Municipio, PR 16 km (10 mi) NNE of here earthquakes near Guaynabo Municipio

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

Aftershocks so far

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

  1. 2.6 1 km N of Pueblito del Rio, Puerto Rico
  2. 3.1 24 km NNW of Loíza, Puerto Rico
  3. 3.3 51 km N of San Juan, Puerto Rico
  4. 2.8 3 km N of San Juan, Puerto Rico
  5. 3.4 29 km N of Dorado, Puerto Rico
  6. 2.1 4 km SSE of Cayey, Puerto Rico
  7. 3.1 1 km NW of Bayamón, Puerto Rico
  8. 2.7 18 km NNE of Luquillo, Puerto Rico
  9. 2.3 1 km S of Río Lajas, Puerto Rico
  10. 2.6 21 km NNE of Dorado, Puerto Rico
  11. 2.4 22 km NNE of Luquillo, Puerto Rico
  12. 3.1 5 km ESE of Cataño, Puerto Rico
  13. 2.9 3 km N of Trujillo Alto, Puerto Rico
  14. 2.7 48 km N of Loíza, Puerto Rico
  15. 2.7 20 km N of Brenas, 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.