QuakeIndex

Earthquake · reviewed by a seismologist

M 2.1md

40 km NW of San Antonio, Puerto Rico

· 13 km deep · released about 43 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Aguadilla Municipio 38 kmAguada Municipio 45 kmRincón Municipio 46 kmIsabela Municipio 48 kmMoca Municipio 51 kmQuebradillas Municipio 56 kmAñasco Municipio 57 kmSan Sebastián Municipio 63 kmCamuy Municipio 63 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 2.1 (md)
Depth
13 km below the surface
Felt
no reports yet
Nearest
Aguadilla Municipio, 38 km SE
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 2533 days ago

This was a minor earthquake. Quakes this small are rarely felt and do not cause damage.

How big was it?

This earthquake released about 43 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 3.1 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 350,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 250,000× the energy of this one
  3. Around the size people start to feel M 3.0 22× the energy of this one
  4. This earthquake M 2.1 about 43 lb of TNT

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 18.7391, -67.3790. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Aguadilla Municipio, PR 38 km (24 mi) NW of here earthquakes near Aguadilla Municipio
Aguada Municipio, PR 45 km (28 mi) NNW of here earthquakes near Aguada Municipio
Rincón Municipio, PR 46 km (29 mi) NNW of here earthquakes near Rincón Municipio
Isabela Municipio, PR 48 km (30 mi) NW of here earthquakes near Isabela Municipio
Moca Municipio, PR 51 km (32 mi) NW of here earthquakes near Moca Municipio
Quebradillas Municipio, PR 56 km (35 mi) WNW of here earthquakes near Quebradillas Municipio

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

Aftershocks so far

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

  1. 3.1 57 km N of San Antonio, Puerto Rico
  2. 2.3 45 km NW of Aguadilla, Puerto Rico
  3. 2.6 66 km N of San Antonio, Puerto Rico
  4. 2.9 Mona Passage
  5. 3.0 67 km N of San Antonio, Puerto Rico
  6. 2.9 60 km N of San Antonio, Puerto Rico
  7. 2.7 47 km NNW of San Antonio, Puerto Rico
  8. 2.3 57 km WNW of Rincón, Puerto Rico
  9. 2.0 18 km W of Stella, Puerto Rico
  10. 2.5 54 km NW of San Antonio, Puerto Rico
  11. 3.0 53 km N of San Antonio, Puerto Rico
  12. 2.9 32 km NNW of San Antonio, Puerto Rico
  13. 3.2 69 km NNW of San Antonio, Puerto Rico
  14. 2.9 65 km NNW of San Antonio, Puerto Rico
  15. 3.0 63 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 710,000 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.