QuakeIndex

Earthquake · reviewed by a seismologist

M 3.1md

105 km NW of San Antonio, Puerto Rico

· 30 km deep · released about 1,200 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Aguadilla Municipio 104 kmIsabela Municipio 111 kmAguada Municipio 112 kmRincón Municipio 112 kmMoca Municipio 117 kmQuebradillas Municipio 119 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
30 km below the surface
Felt
no reports yet
Nearest
Aguadilla Municipio, 104 km SSE
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 2633 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 1,200 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 6.7 290,000× the energy of this one
  2. Mineral, Virginia 2011 M 5.8 13,000× the energy of this one
  3. Magna, Utah 2020 M 5.7 9,100× the energy of this one
  4. This earthquake M 3.1 about 1,200 lb of TNT
  5. Around the size people start to feel M 3.0 this one released 1.2× 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 19.2660, -67.6750. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Aguadilla Municipio, PR 104 km (64 mi) NNW of here earthquakes near Aguadilla Municipio
Isabela Municipio, PR 111 km (69 mi) NW of here earthquakes near Isabela Municipio
Aguada Municipio, PR 112 km (69 mi) NNW of here earthquakes near Aguada Municipio
Rincón Municipio, PR 112 km (70 mi) NNW of here earthquakes near Rincón Municipio
Moca Municipio, PR 117 km (73 mi) NNW of here earthquakes near Moca Municipio
Quebradillas Municipio, PR 119 km (74 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

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

  1. 2.9 67 km NNW of San Antonio, Puerto Rico
  2. 2.7 75 km NW of San Antonio, Puerto Rico
  3. 2.3 92 km NNE of Punta Cana, Dominican Republic
  4. 3.0 108 km NNE of Punta Cana, Dominican Republic
  5. 2.7 103 km NNE of Punta Cana, Dominican Republic
  6. 2.6 73 km NW of San Antonio, Puerto Rico
  7. 2.2 95 km NNE of Punta Cana, Dominican Republic
  8. 2.4 Mona Passage
  9. 2.8 85 km NW of San Antonio, Puerto Rico
  10. 3.4 97 km NNE of Punta Cana, Dominican Republic
  11. 2.1 81 km NE of Punta Cana, Dominican Republic
  12. 2.5 74 km NE of Punta Cana, Dominican Republic
  13. 2.8 87 km NNW of San Antonio, Puerto Rico
  14. 2.8 Mona Passage
  15. 3.1 97 km NE 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 4.7 on 2018-12-07 — it released about 260 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.