QuakeIndex

Earthquake · reviewed by a seismologist

M 3.3md

Puerto Rico region

· 91 km deep · released about 1.5 tons of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Toa Baja Municipio 6 kmDorado Municipio 7 kmCataño Municipio 10 kmVega Alta Municipio 16 kmToa Alta Municipio 17 kmSan Juan Municipio 18 kmBayamón Municipio 18 kmVega Baja Municipio 21 kmGuaynabo 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 3.3 (md)
Depth
91 km below the surface
Felt
1 report · strongest reported intensity II
Nearest
Toa Baja Municipio, 6 km SSE
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 1076 days ago

This was a small earthquake. Shaking like this is often felt indoors nearby and very rarely causes damage. 1 person has reported feeling it to USGS.

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 18.5110, -66.2082. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Toa Baja Municipio, PR 6 km (4 mi) NNW of here earthquakes near Toa Baja Municipio
Dorado Municipio, PR 7 km (4 mi) NE of here earthquakes near Dorado Municipio
Cataño Municipio, PR 10 km (6 mi) NW of here earthquakes near Cataño Municipio
Vega Alta Municipio, PR 16 km (10 mi) ENE of here earthquakes near Vega Alta Municipio
Toa Alta Municipio, PR 17 km (10 mi) NNE of here earthquakes near Toa Alta Municipio
San Juan Municipio, PR 18 km (11 mi) NW of here earthquakes near San Juan Municipio

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

Aftershocks so far

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

  1. 3.2 8 km S of Orocovis, Puerto Rico
  2. 3.3 1 km WSW of Jagual, Puerto Rico
  3. 2.5 3 km NW of Orocovis, Puerto Rico
  4. 2.9 27 km N of Tierras Nuevas Poniente, Puerto Rico
  5. 2.2 6 km NW of Orocovis, Puerto Rico
  6. 2.7 3 km SE of Pájaros, Puerto Rico
  7. 2.1 8 km NW of Coamo, Puerto Rico
  8. 2.9 8 km S of Orocovis, Puerto Rico
  9. 2.4 5 km WNW of Aguas Buenas, Puerto Rico
  10. 3.0 27 km NNW of Brenas, Puerto Rico
  11. 2.6 5 km WSW of Orocovis, Puerto Rico
  12. 1.8 2 km E of Cayey, Puerto Rico
  13. 1.5 5 km SE of Cayey, Puerto Rico
  14. 2.1 4 km NW of Orocovis, Puerto Rico
  15. 3.2 2 km SSE of Coto Norte, 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 4.8 on 2017-08-18 — it released about 160 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.