QuakeIndex

Earthquake · reviewed by a seismologist

M 3.3md

36 km N of Isabela, Puerto Rico

· 8.6 km deep · released about 1.2 tons of TNT

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10 km30 km60 km120 km N Isabela Municipio 38 kmAguadilla Municipio 40 kmQuebradillas Municipio 42 kmCamuy Municipio 47 kmHatillo Municipio 50 kmMoca Municipio 50 kmAguada Municipio 53 kmSan Sebastián Municipio 56 kmArecibo Municipio 58 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
8.6 km below the surface
Felt
no reports yet
Nearest
Isabela Municipio, 38 km S
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 824 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 6,200× the energy of this one
  3. Magna, Utah 2020 M 5.7 4,400× 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 18.8293, -67.0393. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Isabela Municipio, PR 38 km (24 mi) N of here earthquakes near Isabela Municipio
Aguadilla Municipio, PR 40 km (25 mi) NNE of here earthquakes near Aguadilla Municipio
Quebradillas Municipio, PR 42 km (26 mi) NNW of here earthquakes near Quebradillas Municipio
Camuy Municipio, PR 47 km (29 mi) NNW of here earthquakes near Camuy Municipio
Hatillo Municipio, PR 50 km (31 mi) NNW of here earthquakes near Hatillo Municipio
Moca Municipio, PR 50 km (31 mi) N of here earthquakes near Moca Municipio

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

Aftershocks so far

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

  1. 2.9 17 km N of Arecibo, Puerto Rico
  2. 3.2 68 km N of Carrizales, Puerto Rico
  3. 3.2 50 km N of Isabela, Puerto Rico
  4. 3.4 45 km N of Isabela, Puerto Rico
  5. 3.1 71 km N of Carrizales, Puerto Rico
  6. 3.0 38 km NW of San Antonio, Puerto Rico
  7. 3.2 71 km N of Isabela, Puerto Rico
  8. 3.0 12 km N of Hatillo, Puerto Rico
  9. 2.6 25 km NNE of Isabela, Puerto Rico
  10. 3.2 62 km N of Hatillo, Puerto Rico
  11. 3.0 27 km NW of San Antonio, Puerto Rico
  12. 3.2 64 km N of Carrizales, Puerto Rico
  13. 2.9 22 km NW of San Antonio, Puerto Rico
  14. 3.3 60 km N of Isabela, Puerto Rico
  15. 3.3 57 km N of Isabela, 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 6.0 on 2019-09-24 — it released about 12,000 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.