QuakeIndex

Earthquake · reviewed by a seismologist

M 3.1md

106 km N of San Antonio, Puerto Rico

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

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Aguadilla Municipio 108 kmIsabela Municipio 109 kmQuebradillas Municipio 114 kmCamuy Municipio 118 kmAguada Municipio 119 kmMoca Municipio 120 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
9.0 km below the surface
Felt
no reports yet
Nearest
Aguadilla Municipio, 108 km S
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 2412 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 6.7 280,000× the energy of this one
  2. Mineral, Virginia 2011 M 5.8 12,000× the energy of this one
  3. Magna, Utah 2020 M 5.7 8,800× 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 1.3× 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 19.4445, -67.2385. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Aguadilla Municipio, PR 108 km (67 mi) N of here earthquakes near Aguadilla Municipio
Isabela Municipio, PR 109 km (68 mi) NNW of here earthquakes near Isabela Municipio
Quebradillas Municipio, PR 114 km (71 mi) NNW of here earthquakes near Quebradillas Municipio
Camuy Municipio, PR 118 km (73 mi) NNW of here earthquakes near Camuy Municipio
Aguada Municipio, PR 119 km (74 mi) N of here earthquakes near Aguada Municipio
Moca Municipio, PR 120 km (74 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

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

  1. 3.0 64 km NNW of San Antonio, Puerto Rico
  2. 2.7 96 km NNW of San Antonio, Puerto Rico
  3. 3.4 87 km NNW of San Antonio, Puerto Rico
  4. 3.1 62 km N of San Antonio, Puerto Rico
  5. 3.0 78 km NNW of San Antonio, Puerto Rico
  6. 2.8 72 km NNW of San Antonio, Puerto Rico
  7. 2.9 70 km N of Isabela, Puerto Rico
  8. 2.8 Mona Passage
  9. 3.5 93 km NNW of San Antonio, Puerto Rico
  10. 3.1 78 km N of Isabela, Puerto Rico
  11. 3.0 71 km NNW of San Antonio, Puerto Rico
  12. 3.1 96 km NNW of San Antonio, Puerto Rico
  13. 3.0 91 km NNW of San Antonio, Puerto Rico
  14. 2.7 83 km N of Isabela, Puerto Rico
  15. 3.2 92 km NNW 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 25,000 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.