QuakeIndex

Earthquake · reviewed by a seismologist

M 3.7md

24 km N of Isabela, Puerto Rico

· 62 km deep · released about 4.7 tons of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Isabela Municipio 27 kmQuebradillas Municipio 29 kmAguadilla Municipio 32 kmCamuy Municipio 33 kmHatillo Municipio 37 kmMoca Municipio 40 kmSan Sebastián Municipio 43 kmAguada Municipio 44 kmArecibo Municipio 45 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 3.7 (md)
Depth
62 km below the surface
Felt
2 reports · strongest reported intensity II
Nearest
Isabela Municipio, 27 km S
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 1510 days ago

This was a small earthquake. Shaking like this is often felt indoors nearby and very rarely causes damage. 2 people have reported feeling it to USGS.

How big was it?

This earthquake released about 4.7 tons of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 4.7 would have released about 32 times as much.

  1. Northridge, California 1994 M 6.7 36,000× the energy of this one
  2. Mineral, Virginia 2011 M 5.8 1,600× the energy of this one
  3. Magna, Utah 2020 M 5.7 1,100× the energy of this one
  4. This earthquake M 3.7 about 4.7 tons of TNT
  5. Around the size people start to feel M 3.0 this one released 9.8× 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 18.7215, -66.9821. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Isabela Municipio, PR 27 km (17 mi) N of here earthquakes near Isabela Municipio
Quebradillas Municipio, PR 29 km (18 mi) NNW of here earthquakes near Quebradillas Municipio
Aguadilla Municipio, PR 32 km (20 mi) NNE of here earthquakes near Aguadilla Municipio
Camuy Municipio, PR 33 km (21 mi) NNW of here earthquakes near Camuy Municipio
Hatillo Municipio, PR 37 km (23 mi) NNW of here earthquakes near Hatillo Municipio
Moca Municipio, PR 40 km (25 mi) NNE of here earthquakes near Moca Municipio

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

Aftershocks so far

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

  1. 3.8 69 km N of Hatillo, Puerto Rico
  2. 3.4 70 km N of Isabela, Puerto Rico
  3. 2.8 14 km NNE of Hatillo, Puerto Rico
  4. 2.4 2 km WNW of San Sebastián, Puerto Rico
  5. 3.5 42 km NNW of San Antonio, Puerto Rico
  6. 2.9 16 km NNW of San Antonio, Puerto Rico
  7. 2.9 22 km N of Arecibo, Puerto Rico
  8. 3.1 40 km NNW of San Antonio, Puerto Rico
  9. 2.9 46 km N of Isabela, Puerto Rico
  10. 2.0 2 km SW of Lares, Puerto Rico
  11. 3.7 41 km NNW of San Antonio, Puerto Rico
  12. 3.5 3 km S of Animas, Puerto Rico
  13. 2.7 13 km N of Isabela, Puerto Rico
  14. 2.7 16 km NE of Arecibo, Puerto Rico
  15. 3.0 4 km SE of Rafael Capo, 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 3,200 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.