QuakeIndex

Earthquake · reviewed by a seismologist

M 3.1md

52 km NW of San Antonio, Puerto Rico

· 8.1 km deep · released about 1,500 lb of TNT

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10 km30 km60 km120 km N Aguadilla Municipio 51 kmAguada Municipio 58 kmRincón Municipio 58 kmIsabela Municipio 60 kmMoca Municipio 64 kmQuebradillas Municipio 68 kmAñasco Municipio 69 kmSan Sebastián Municipio 75 kmCamuy Municipio 75 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 3.1 (md)
Depth
8.1 km below the surface
Felt
no reports yet
Nearest
Aguadilla Municipio, 51 km SE
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 918 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 1,500 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 4.1 would have released about 32 times as much.

  1. Northridge, California 1994 M 6.7 220,000× the energy of this one
  2. Mineral, Virginia 2011 M 5.8 9,800× the energy of this one
  3. Magna, Utah 2020 M 5.7 6,900× the energy of this one
  4. This earthquake M 3.1 about 1,500 lb of TNT
  5. Around the size people start to feel M 3.0 this one released 1.6× 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 18.8290, -67.4508. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Aguadilla Municipio, PR 51 km (31 mi) NW of here earthquakes near Aguadilla Municipio
Aguada Municipio, PR 58 km (36 mi) NNW of here earthquakes near Aguada Municipio
Rincón Municipio, PR 58 km (36 mi) NNW of here earthquakes near Rincón Municipio
Isabela Municipio, PR 60 km (37 mi) NW of here earthquakes near Isabela Municipio
Moca Municipio, PR 64 km (40 mi) NW of here earthquakes near Moca Municipio
Quebradillas Municipio, PR 68 km (42 mi) NW of here earthquakes near Quebradillas Municipio

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

Aftershocks so far

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

  1. 2.9 36 km NNW of San Antonio, Puerto Rico
  2. 3.6 51 km N of Isabela, Puerto Rico
  3. 3.3 41 km NW of San Antonio, Puerto Rico
  4. 3.0 33 km WNW of Rincón, Puerto Rico
  5. 3.2 69 km NW of San Antonio, Puerto Rico
  6. 2.9 36 km NNW of San Antonio, Puerto Rico
  7. 3.4 48 km N of Isabela, Puerto Rico
  8. 3.4 8 km WNW of San Antonio, Puerto Rico
  9. 3.2 80 km NW of San Antonio, Puerto Rico
  10. 3.2 50 km N of Isabela, Puerto Rico
  11. 3.4 16 km NW of Rincón, Puerto Rico
  12. 3.4 45 km N of Isabela, Puerto Rico
  13. 3.0 38 km NW of San Antonio, Puerto Rico
  14. 3.0 27 km NW of San Antonio, Puerto Rico
  15. 2.8 24 km WNW of Rincón, 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 19,000 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.