QuakeIndex

Earthquake · reviewed by a seismologist

M 2.1Md

51 km NW of San Antonio, Puerto Rico

· 8.0 km deep · released about 43 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Aguadilla Municipio 49 kmAguada Municipio 56 kmRincón Municipio 57 kmIsabela Municipio 59 kmMoca Municipio 62 kmQuebradillas Municipio 67 kmAñasco Municipio 67 kmSan Sebastián Municipio 74 kmCamuy Municipio 74 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
8.0 km below the surface
Felt
no reports yet
Nearest
Aguadilla Municipio, 49 km SE
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 3702 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 18.8132, -67.4489. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Aguadilla Municipio, PR 49 km (30 mi) NW of here earthquakes near Aguadilla Municipio
Aguada Municipio, PR 56 km (35 mi) NNW of here earthquakes near Aguada Municipio
Rincón Municipio, PR 57 km (35 mi) NNW of here earthquakes near Rincón Municipio
Isabela Municipio, PR 59 km (36 mi) NW of here earthquakes near Isabela Municipio
Moca Municipio, PR 62 km (39 mi) NW of here earthquakes near Moca Municipio
Quebradillas Municipio, PR 67 km (42 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

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

  1. 2.8 54 km NW of San Antonio, Puerto Rico
  2. 2.4 29 km N of Isabela, Puerto Rico
  3. 2.9 37 km WNW of Rincón, Puerto Rico
  4. 2.5 15 km NNW of Rincón, Puerto Rico
  5. 2.5 60 km NW of San Antonio, Puerto Rico
  6. 3.1 75 km NNW of San Antonio, Puerto Rico
  7. 3.1 67 km NNW of San Antonio, Puerto Rico
  8. 3.1 78 km N of San Antonio, Puerto Rico
  9. 2.4 36 km NW of San Antonio, Puerto Rico
  10. 3.4 93 km NE of Punta Cana, Dominican Republic
  11. 2.5 42 km NNW of San Antonio, Puerto Rico
  12. 3.1 33 km NW of Rincón, Puerto Rico
  13. 3.0 74 km NE of Punta Cana, Dominican Republic
  14. 2.9 79 km NW of San Antonio, Puerto Rico
  15. 3.2 46 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.

On USGS

QuakeIndex does not issue warnings. For earthquake early warning see ShakeAlert.