QuakeIndex

Earthquake · reviewed by a seismologist

M 3.1md

36 km NNW of San Antonio, Puerto Rico

· 19 km deep · released about 1,300 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Aguadilla Municipio 36 kmIsabela Municipio 42 kmAguada Municipio 47 kmQuebradillas Municipio 49 kmMoca Municipio 49 kmRincón Municipio 51 kmCamuy Municipio 56 kmAñasco Municipio 58 kmSan Sebastián Municipio 59 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
19 km below the surface
Felt
2 reports · strongest reported intensity III
Nearest
Aguadilla Municipio, 36 km SSE
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 1829 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 1,300 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 6.7 250,000× the energy of this one
  2. Mineral, Virginia 2011 M 5.8 11,000× the energy of this one
  3. Magna, Utah 2020 M 5.7 7,900× the energy of this one
  4. This earthquake M 3.1 about 1,300 lb of TNT
  5. Around the size people start to feel M 3.0 this one released 1.4× 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 18.7940, -67.2446. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Aguadilla Municipio, PR 36 km (23 mi) NNW of here earthquakes near Aguadilla Municipio
Isabela Municipio, PR 42 km (26 mi) NW of here earthquakes near Isabela Municipio
Aguada Municipio, PR 47 km (29 mi) N of here earthquakes near Aguada Municipio
Quebradillas Municipio, PR 49 km (31 mi) NW of here earthquakes near Quebradillas Municipio
Moca Municipio, PR 49 km (31 mi) NNW of here earthquakes near Moca Municipio
Rincón Municipio, PR 51 km (31 mi) N of here earthquakes near Rincón Municipio

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

Aftershocks so far

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

  1. 2.7 13 km NNW of Camuy, Puerto Rico
  2. 2.6 42 km NW of San Antonio, Puerto Rico
  3. 3.0 51 km N of Isabela, Puerto Rico
  4. 3.0 19 km N of Camuy, Puerto Rico
  5. 2.6 42 km NW of Aguadilla, Puerto Rico
  6. 2.8 24 km NW of San Antonio, Puerto Rico
  7. 3.5 84 km NNW of San Antonio, Puerto Rico
  8. 2.5 45 km NNW of San Antonio, Puerto Rico
  9. 3.1 59 km NW of San Antonio, Puerto Rico
  10. 3.7 60 km N of Isabela, Puerto Rico
  11. 3.4 60 km NW of San Antonio, Puerto Rico
  12. 3.5 84 km NNW of San Antonio, Puerto Rico
  13. 3.8 47 km NW of Aguadilla, Puerto Rico
  14. 3.4 59 km N of San Antonio, Puerto Rico
  15. 3.5 79 km N of San Antonio, 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 22,000 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.