QuakeIndex

Earthquake · reviewed by a seismologist

M 3.3md

3 km SSE of Pájaros, Puerto Rico

· 57 km deep · released about 1.2 tons of TNT

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10 km30 km60 km120 km N Bayamón Municipio 3 kmToa Alta Municipio 5 kmNaranjito Municipio 8 kmGuaynabo Municipio 9 kmAguas Buenas Municipio 12 kmCataño Municipio 13 kmToa Baja Municipio 13 kmComerío Municipio 13 kmCorozal Municipio 14 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
57 km below the surface
Felt
no reports yet
Nearest
Bayamón Municipio, 3 km ENE
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 1345 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 18.3420, -66.1990. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Bayamón Municipio, PR 3 km (2 mi) WSW of here earthquakes near Bayamón Municipio
Toa Alta Municipio, PR 5 km (3 mi) ESE of here earthquakes near Toa Alta Municipio
Naranjito Municipio, PR 8 km (5 mi) NE of here earthquakes near Naranjito Municipio
Guaynabo Municipio, PR 9 km (6 mi) W of here earthquakes near Guaynabo Municipio
Aguas Buenas Municipio, PR 12 km (8 mi) NW of here earthquakes near Aguas Buenas Municipio
Cataño Municipio, PR 13 km (8 mi) SSW of here earthquakes near Cataño Municipio

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

Aftershocks so far

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

  1. 3.0 4 km NW of Corozal, Puerto Rico
  2. 2.2 6 km NNW of Jayuya, Puerto Rico
  3. 2.6 5 km NW of Palomas, Puerto Rico
  4. 3.7 0 km ESE of Campanilla, Puerto Rico
  5. 2.9 4 km N of Animas, Puerto Rico
  6. 2.9 3 km E of San Juan, Puerto Rico
  7. 3.1 12 km N of Brenas, Puerto Rico
  8. 3.1 10 km NW of San Juan, Puerto Rico
  9. 3.3 3 km SE of Trujillo Alto, Puerto Rico
  10. 2.7 Puerto Rico region
  11. 3.2 24 km N of San Juan, Puerto Rico
  12. 1.6 3 km ENE of Capitanejo, Puerto Rico
  13. 3.7 Puerto Rico region
  14. 3.2 5 km ESE of Pájaros, Puerto Rico
  15. 3.1 4 km SSW of Florida, 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 4.6 on 2019-03-12 — it released about 100 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.