QuakeIndex

Earthquake · reviewed by a seismologist

M 3.3md

7 km ESE of San Juan, Puerto Rico

· 126 km deep · released about 1.2 tons of TNT

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10 km30 km60 km120 km N San Juan Municipio 4 kmCarolina Municipio 9 kmLoíza Municipio 10 kmCataño Municipio 12 kmTrujillo Alto Municipio 12 kmGuaynabo Municipio 14 kmToa Baja Municipio 17 kmBayamón Municipio 18 kmGurabo 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 3.3 (md)
Depth
126 km below the surface
Felt
no reports yet
Nearest
San Juan Municipio, 4 km WSW
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 616 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 1.2 tons of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 4.3 would have released about 32 times as much.

  1. Northridge, California 1994 M 6.7 140,000× the energy of this one
  2. Mineral, Virginia 2011 M 5.8 6,500× the energy of this one
  3. Magna, Utah 2020 M 5.7 4,600× the energy of this one
  4. This earthquake M 3.3 about 1.2 tons of TNT
  5. Around the size people start to feel M 3.0 this one released 2.5× more

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 18.4437, -66.0350. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
San Juan Municipio, PR 4 km (3 mi) ENE of here earthquakes near San Juan Municipio
Carolina Municipio, PR 9 km (5 mi) NW of here earthquakes near Carolina Municipio
Loíza Municipio, PR 10 km (6 mi) W of here earthquakes near Loíza Municipio
Cataño Municipio, PR 12 km (7 mi) E of here earthquakes near Cataño Municipio
Trujillo Alto Municipio, PR 12 km (8 mi) NNW of here earthquakes near Trujillo Alto Municipio
Guaynabo Municipio, PR 14 km (9 mi) NE of here earthquakes near Guaynabo Municipio

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

Aftershocks so far

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

  1. 1.7 7 km NNE of Yaurel, Puerto Rico
  2. 3.2 28 km NNE of Dorado, Puerto Rico
  3. 3.6 1 km SSE of Galateo, Puerto Rico
  4. 2.8 5 km E of Naranjito, Puerto Rico
  5. 3.0 4 km NW of Orocovis, Puerto Rico
  6. 2.5 5 km SSE of Bajandas, Puerto Rico
  7. 3.0 2 km N of Tierras Nuevas Poniente, Puerto Rico
  8. 2.1 5 km SSE of Bajandas, Puerto Rico
  9. 2.6 3 km ESE of Cataño, Puerto Rico
  10. 3.1 1 km S of Campanilla, Puerto Rico
  11. 3.0 5 km NNW of Dorado, Puerto Rico
  12. 3.0 42 km N of San Juan, Puerto Rico
  13. 2.2 3 km NW of Orocovis, Puerto Rico
  14. 2.4 4 km SW of Las Piedras, Puerto Rico
  15. 3.0 12 km NNW 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.