QuakeIndex

Earthquake · reviewed by a seismologist

M 4.0md

49 km NW of San Antonio, Puerto Rico

· 9.0 km deep · released about 17 tons of TNT

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10 km30 km60 km120 km N Aguadilla Municipio 47 kmAguada Municipio 54 kmRincón Municipio 55 kmIsabela Municipio 57 kmMoca Municipio 60 kmQuebradillas Municipio 65 kmAñasco Municipio 66 kmSan Sebastián Municipio 72 kmCamuy Municipio 72 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 4.0 (md)
Depth
9.0 km below the surface
Felt
5 reports · strongest reported intensity III
Nearest
Aguadilla Municipio, 47 km SE
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 865 days ago

This was a light earthquake. It is usually felt clearly nearby and can rattle windows and dishes, but damage is uncommon. 5 people have reported feeling it to USGS.

How big was it?

This earthquake released about 17 tons of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 5.0 would have released about 32 times as much.

  1. Northridge, California 1994 M 6.7 10,000× the energy of this one
  2. Mineral, Virginia 2011 M 5.8 450× the energy of this one
  3. Magna, Utah 2020 M 5.7 320× the energy of this one
  4. This earthquake M 4.0 about 17 tons of TNT
  5. Around the size people start to feel M 3.0 this one released 35× 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 18.8028, -67.4346. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Aguadilla Municipio, PR 47 km (29 mi) NW of here earthquakes near Aguadilla Municipio
Aguada Municipio, PR 54 km (34 mi) NNW of here earthquakes near Aguada Municipio
Rincón Municipio, PR 55 km (34 mi) NNW of here earthquakes near Rincón Municipio
Isabela Municipio, PR 57 km (35 mi) NW of here earthquakes near Isabela Municipio
Moca Municipio, PR 60 km (37 mi) NW of here earthquakes near Moca Municipio
Quebradillas Municipio, PR 65 km (41 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

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

  1. 3.4 45 km N of Isabela, Puerto Rico
  2. 3.0 38 km NW of San Antonio, Puerto Rico
  3. 2.6 25 km NNE of Isabela, Puerto Rico
  4. 2.9 21 km W of Rincón, Puerto Rico
  5. 3.0 27 km NW of San Antonio, Puerto Rico
  6. 2.8 24 km WNW of Rincón, Puerto Rico
  7. 2.9 22 km NW of San Antonio, Puerto Rico
  8. 3.0 14 km WNW of Rincón, Puerto Rico
  9. 3.3 72 km NW of Rincón, Puerto Rico
  10. 3.1 77 km NW of San Antonio, Puerto Rico
  11. 2.6 8 km NW of Rincón, Puerto Rico
  12. 3.3 60 km N of Isabela, Puerto Rico
  13. 3.3 57 km N of Isabela, Puerto Rico
  14. 3.4 71 km NNW of San Antonio, Puerto Rico
  15. 3.7 64 km N of Isabela, 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 900 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.