QuakeIndex

Earthquake · reviewed by a seismologist

M 3.3md

1 km SE of Toa Baja, Puerto Rico

· 107 km deep · released about 1.5 tons of TNT

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10 km30 km60 km120 km N Dorado Municipio 5 kmToa Baja Municipio 6 kmToa Alta Municipio 8 kmVega Alta Municipio 9 kmCataño Municipio 11 kmBayamón Municipio 13 kmVega Baja Municipio 16 kmNaranjito Municipio 16 kmCorozal Municipio 16 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
107 km below the surface
Felt
no reports yet
Nearest
Dorado Municipio, 5 km NNW
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 1535 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 1.5 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 6.7 110,000× the energy of this one
  2. Mineral, Virginia 2011 M 5.8 5,100× the energy of this one
  3. Magna, Utah 2020 M 5.7 3,600× the energy of this one
  4. This earthquake M 3.3 about 1.5 tons of TNT
  5. Around the size people start to feel M 3.0 this one released 3.1× 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 18.4328, -66.2493. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Dorado Municipio, PR 5 km (3 mi) SSE of here earthquakes near Dorado Municipio
Toa Baja Municipio, PR 6 km (4 mi) WSW of here earthquakes near Toa Baja Municipio
Toa Alta Municipio, PR 8 km (5 mi) N of here earthquakes near Toa Alta Municipio
Vega Alta Municipio, PR 9 km (6 mi) E of here earthquakes near Vega Alta Municipio
Cataño Municipio, PR 11 km (7 mi) W of here earthquakes near Cataño Municipio
Bayamón Municipio, PR 13 km (8 mi) NW of here earthquakes near Bayamón Municipio

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

Aftershocks so far

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

  1. 3.3 1 km S of Comerío, Puerto Rico
  2. 3.2 2 km ESE of Mucarabones, Puerto Rico
  3. 3.2 17 km N of Tierras Nuevas Poniente, Puerto Rico
  4. 3.0 4 km NNW of Vega Baja, Puerto Rico
  5. 2.0 0 km ENE of Parcelas La Milagrosa, Puerto Rico
  6. 3.2 3 km ENE of Guaynabo, Puerto Rico
  7. 2.3 3 km ESE of Comerío, Puerto Rico
  8. 1.8 3 km SW of Naranjito, Puerto Rico
  9. 3.4 1 km SSW of Pájaros, Puerto Rico
  10. 3.5 3 km S of Animas, Puerto Rico
  11. 2.7 16 km NE of Arecibo, Puerto Rico
  12. 2.8 13 km N of Levittown, Puerto Rico
  13. 3.5 1 km NNW of Trujillo Alto, Puerto Rico
  14. 2.6 5 km WNW of Jagual, Puerto Rico
  15. 2.4 6 km ESE of Villalba, 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 4.4 on 2018-12-09 — it released about 40 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.