QuakeIndex

Earthquake · reviewed by a seismologist

M 3.1md

75 km NW of San Antonio, Puerto Rico

· 12 km deep · released about 1,400 lb of TNT

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10 km30 km60 km120 km N Aguadilla Municipio 73 kmRincón Municipio 78 kmAguada Municipio 78 kmIsabela Municipio 83 kmMoca Municipio 86 kmAñasco Municipio 90 kmQuebradillas Municipio 92 kmMayagüez Municipio 97 kmSan Sebastián Municipio 97 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
12 km below the surface
Felt
no reports yet
Nearest
Aguadilla Municipio, 73 km SE
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 135 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 1,400 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 6.7 230,000× the energy of this one
  2. Mineral, Virginia 2011 M 5.8 10,000× the energy of this one
  3. Magna, Utah 2020 M 5.7 7,400× the energy of this one
  4. This earthquake M 3.1 about 1,400 lb of TNT
  5. Around the size people start to feel M 3.0 this one released 1.5× 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 18.9240, -67.6507. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Aguadilla Municipio, PR 73 km (45 mi) NW of here earthquakes near Aguadilla Municipio
Rincón Municipio, PR 78 km (48 mi) NNW of here earthquakes near Rincón Municipio
Aguada Municipio, PR 78 km (49 mi) NW of here earthquakes near Aguada Municipio
Isabela Municipio, PR 83 km (52 mi) NW of here earthquakes near Isabela Municipio
Moca Municipio, PR 86 km (53 mi) NW of here earthquakes near Moca Municipio
Añasco Municipio, PR 90 km (56 mi) NW of here earthquakes near Añasco Municipio

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

Aftershocks so far

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

  1. 3.2 40 km NNW of San Antonio, Puerto Rico
  2. 2.9 74 km NW of San Antonio, Puerto Rico
  3. 3.2 52 km NW of San Antonio, Puerto Rico
  4. 3.3 84 km ENE of Punta Cana, Dominican Republic
  5. 3.1 62 km NNW of San Antonio, Puerto Rico
  6. 3.1 43 km NNW of San Antonio, Puerto Rico
  7. 3.1 56 km NW of San Antonio, Puerto Rico
  8. 3.8 92 km NW of San Antonio, Puerto Rico
  9. 3.1 37 km NW of San Antonio, Puerto Rico
  10. 3.3 90 km NW of San Antonio, Puerto Rico
  11. 3.4 46 km NNW of San Antonio, Puerto Rico
  12. 3.1 84 km ENE of Punta Cana, Dominican Republic
  13. 3.2 66 km NW of Rincón, Puerto Rico
  14. 3.0 69 km NW of San Antonio, Puerto Rico
  15. 3.4 55 km NNE of Punta Cana, Dominican Republic

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 21,000 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.