QuakeIndex

Earthquake · reviewed by a seismologist

M 3.9md

47 km N of Hatillo, Puerto Rico

· 50 km deep · released about 11 tons of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Isabela Municipio 50 kmQuebradillas Municipio 50 kmCamuy Municipio 52 kmHatillo Municipio 53 kmAguadilla Municipio 56 kmArecibo Municipio 57 kmBarceloneta Municipio 60 kmMoca Municipio 63 kmSan Sebastián Municipio 65 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 3.9 (md)
Depth
50 km below the surface
Felt
7 reports · strongest reported intensity II
Nearest
Isabela Municipio, 50 km SSW
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 1844 days ago

This was a small earthquake. Shaking like this is often felt indoors nearby and very rarely causes damage. 7 people have reported feeling it to USGS.

How big was it?

This earthquake released about 11 tons of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 4.9 would have released about 32 times as much.

  1. Northridge, California 1994 M 6.7 16,000× the energy of this one
  2. Mineral, Virginia 2011 M 5.8 710× the energy of this one
  3. Magna, Utah 2020 M 5.7 500× the energy of this one
  4. This earthquake M 3.9 about 11 tons of TNT
  5. Around the size people start to feel M 3.0 this one released 22× 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 18.9131, -66.8755. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Isabela Municipio, PR 50 km (31 mi) NNE of here earthquakes near Isabela Municipio
Quebradillas Municipio, PR 50 km (31 mi) N of here earthquakes near Quebradillas Municipio
Camuy Municipio, PR 52 km (32 mi) N of here earthquakes near Camuy Municipio
Hatillo Municipio, PR 53 km (33 mi) N of here earthquakes near Hatillo Municipio
Aguadilla Municipio, PR 56 km (35 mi) NNE of here earthquakes near Aguadilla Municipio
Arecibo Municipio, PR 57 km (36 mi) NNW of here earthquakes near Arecibo 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. 3.3 50 km N of Isabela, Puerto Rico
  2. 3.6 63 km N of Hatillo, Puerto Rico
  3. 3.1 Puerto Rico region
  4. 2.4 19 km N of Quebradillas, Puerto Rico
  5. 3.3 26 km N of Hatillo, Puerto Rico
  6. 3.0 15 km NNE of Carrizales, Puerto Rico
  7. 3.0 76 km N of Tierras Nuevas Poniente, Puerto Rico
  8. 3.0 80 km N of Tierras Nuevas Poniente, Puerto Rico
  9. 3.3 7 km N of Camuy, Puerto Rico
  10. 3.3 60 km N of San Antonio, Puerto Rico
  11. 3.1 11 km NNE of San Antonio, Puerto Rico
  12. 3.4 80 km N of Tierras Nuevas Poniente, Puerto Rico
  13. 3.3 36 km NNW of San Antonio, Puerto Rico
  14. 3.5 72 km N of Tierras Nuevas Poniente, Puerto Rico
  15. 3.5 74 km N of Tierras Nuevas Poniente, 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 1,400 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.