QuakeIndex

Earthquake · reviewed by a seismologist

M 2.1md

8 km WNW of San Antonio, Puerto Rico

· 87 km deep · released about 41 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Aguadilla Municipio 6 kmAguada Municipio 17 kmIsabela Municipio 17 kmMoca Municipio 19 kmRincón Municipio 22 kmQuebradillas Municipio 26 kmAñasco Municipio 27 kmSan Sebastián Municipio 30 kmCamuy Municipio 33 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
87 km below the surface
Felt
no reports yet
Nearest
Aguadilla Municipio, 6 km SSE
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 2771 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 41 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 5.8 370,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 260,000× the energy of this one
  3. Around the size people start to feel M 3.0 23× the energy of this one
  4. This earthquake M 2.1 about 41 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 18.5243, -67.1680. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Aguadilla Municipio, PR 6 km (3 mi) NNW of here earthquakes near Aguadilla Municipio
Aguada Municipio, PR 17 km (10 mi) N of here earthquakes near Aguada Municipio
Isabela Municipio, PR 17 km (10 mi) WNW of here earthquakes near Isabela Municipio
Moca Municipio, PR 19 km (12 mi) NNW of here earthquakes near Moca Municipio
Rincón Municipio, PR 22 km (14 mi) NNE of here earthquakes near Rincón Municipio
Quebradillas Municipio, PR 26 km (16 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

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

  1. 1.6 1 km NNW of Monte Grande, Puerto Rico
  2. 2.5 11 km N of Arecibo, Puerto Rico
  3. 2.2 5 km N of San Germán, Puerto Rico
  4. 2.1 1 km SE of Espino, Puerto Rico
  5. 2.5 0 km NNE of Monte Grande, Puerto Rico
  6. 2.0 4 km SSW of La Playa, Puerto Rico
  7. 2.2 12 km WNW of Puerto Real, Puerto Rico
  8. 2.6 29 km WNW of Rincón, Puerto Rico
  9. 2.7 13 km NNW of Rincón, Puerto Rico
  10. 2.8 56 km NW of San Antonio, Puerto Rico
  11. 1.7 3 km S of Maricao, Puerto Rico
  12. 1.8 3 km W of La Playa, Puerto Rico
  13. 2.2 7 km WSW of Maricao, Puerto Rico
  14. 2.5 2 km S of Las Marías, Puerto Rico
  15. 2.1 11 km WNW of Puerto Real, 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 4.3 on 2017-10-14 — it released about 2,100 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.