QuakeIndex

Earthquake · reviewed by a seismologist

M 4.3ml

39 km NNW of San Antonio, Puerto Rico

· 10 km deep · released about 43 tons of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Aguadilla Municipio 40 kmIsabela Municipio 45 kmAguada Municipio 50 kmQuebradillas Municipio 52 kmMoca Municipio 53 kmRincón Municipio 54 kmCamuy Municipio 58 kmAñasco Municipio 61 kmSan Sebastián Municipio 62 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 4.3 (ml)
Depth
10 km below the surface
Felt
34 reports · strongest reported intensity IV
Nearest
Aguadilla Municipio, 40 km SSE
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 319 days ago

This was a light earthquake. It is usually felt clearly nearby and can rattle windows and dishes, but damage is uncommon. 34 people have reported feeling it to USGS.

How big was it?

This earthquake released about 43 tons of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 5.3 would have released about 32 times as much.

  1. Northridge, California 1994 M 6.7 4,000× the energy of this one
  2. Mineral, Virginia 2011 M 5.8 180× the energy of this one
  3. Magna, Utah 2020 M 5.7 130× the energy of this one
  4. This earthquake M 4.3 about 43 tons of TNT
  5. Around the size people start to feel M 3.0 this one released 89× 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 18.8243, -67.2471. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Aguadilla Municipio, PR 40 km (25 mi) NNW of here earthquakes near Aguadilla Municipio
Isabela Municipio, PR 45 km (28 mi) NNW of here earthquakes near Isabela Municipio
Aguada Municipio, PR 50 km (31 mi) N of here earthquakes near Aguada Municipio
Quebradillas Municipio, PR 52 km (32 mi) NW of here earthquakes near Quebradillas Municipio
Moca Municipio, PR 53 km (33 mi) NNW of here earthquakes near Moca Municipio
Rincón Municipio, PR 54 km (34 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

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

  1. 3.2 58 km N of Hatillo, Puerto Rico
  2. 3.2 14 km NNW of Camuy, Puerto Rico
  3. 3.2 34 km NW of San Antonio, Puerto Rico
  4. 3.3 32 km WNW of Rincón, Puerto Rico
  5. 3.4 81 km NNW of San Antonio, Puerto Rico
  6. 3.3 64 km NW of San Antonio, Puerto Rico
  7. 3.0 42 km NW of San Antonio, Puerto Rico
  8. 3.5 42 km NW of San Antonio, Puerto Rico
  9. 2.8 23 km NNW of Camuy, Puerto Rico
  10. 3.0 22 km N of San Antonio, Puerto Rico
  11. 2.9 40 km NNW of San Antonio, Puerto Rico
  12. 3.0 62 km NNW of San Antonio, Puerto Rico
  13. 3.1 29 km WNW of San Antonio, Puerto Rico
  14. 4.0 89 km NNW of San Antonio, Puerto Rico
  15. 2.7 25 km NW of Rincón, 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 350 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.