QuakeIndex

Earthquake · reviewed by a seismologist

M 3.5md

87 km N of Isabela, Puerto Rico

· 38 km deep · released about 2.3 tons of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Isabela Municipio 90 kmAguadilla Municipio 90 kmQuebradillas Municipio 93 kmCamuy Municipio 97 kmHatillo Municipio 100 kmMoca Municipio 101 kmAguada Municipio 102 kmArecibo Municipio 105 kmRincón Municipio 107 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 3.5 (md)
Depth
38 km below the surface
Felt
1 report · strongest reported intensity II
Nearest
Isabela Municipio, 90 km S
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 1513 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 2.3 tons of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 4.5 would have released about 32 times as much.

  1. Northridge, California 1994 M 6.7 75,000× the energy of this one
  2. Mineral, Virginia 2011 M 5.8 3,300× the energy of this one
  3. Magna, Utah 2020 M 5.7 2,400× the energy of this one
  4. This earthquake M 3.5 about 2.3 tons of TNT
  5. Around the size people start to feel M 3.0 this one released 4.7× 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 19.2898, -67.1026. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Isabela Municipio, PR 90 km (56 mi) N of here earthquakes near Isabela Municipio
Aguadilla Municipio, PR 90 km (56 mi) N of here earthquakes near Aguadilla Municipio
Quebradillas Municipio, PR 93 km (58 mi) NNW of here earthquakes near Quebradillas Municipio
Camuy Municipio, PR 97 km (60 mi) NNW of here earthquakes near Camuy Municipio
Hatillo Municipio, PR 100 km (62 mi) NNW of here earthquakes near Hatillo Municipio
Moca Municipio, PR 101 km (63 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

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

  1. 3.4 59 km N of Isabela, Puerto Rico
  2. 3.2 73 km NNW of San Antonio, Puerto Rico
  3. 3.5 62 km N of Isabela, Puerto Rico
  4. 3.3 47 km NNW of San Antonio, Puerto Rico
  5. 3.0 51 km N of Hatillo, Puerto Rico
  6. 3.0 48 km N of Hatillo, Puerto Rico
  7. 3.3 73 km N of Isabela, Puerto Rico
  8. 3.0 41 km NNW of San Antonio, Puerto Rico
  9. 3.1 63 km N of Hatillo, Puerto Rico
  10. 3.6 63 km N of San Antonio, Puerto Rico
  11. 3.8 86 km N of Isabela, Puerto Rico
  12. 3.2 64 km N of San Antonio, Puerto Rico
  13. 3.4 96 km N of Isabela, Puerto Rico
  14. 3.6 91 km N of Isabela, Puerto Rico
  15. 3.6 90 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 6,700 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.