QuakeIndex

Earthquake · reviewed by a seismologist

M 4.1md

79 km N of San Antonio, Puerto Rico

· 24 km deep · released about 21 tons of TNT

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10 km30 km60 km120 km N Aguadilla Municipio 81 kmIsabela Municipio 82 kmQuebradillas Municipio 87 kmCamuy Municipio 91 kmAguada Municipio 93 kmMoca Municipio 93 kmHatillo Municipio 94 kmRincón Municipio 97 kmSan Sebastián Municipio 100 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 4.1 (md)
Depth
24 km below the surface
Felt
13 reports · strongest reported intensity III
Nearest
Aguadilla Municipio, 81 km S
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 2269 days ago

This was a light earthquake. It is usually felt clearly nearby and can rattle windows and dishes, but damage is uncommon. 13 people have reported feeling it to USGS.

How big was it?

This earthquake released about 21 tons of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 5.1 would have released about 32 times as much.

  1. Northridge, California 1994 M 6.7 7,900× the energy of this one
  2. Mineral, Virginia 2011 M 5.8 350× the energy of this one
  3. Magna, Utah 2020 M 5.7 250× the energy of this one
  4. This earthquake M 4.1 about 21 tons of TNT
  5. Around the size people start to feel M 3.0 this one released 45× 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 19.2096, -67.1768. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Aguadilla Municipio, PR 81 km (50 mi) N of here earthquakes near Aguadilla Municipio
Isabela Municipio, PR 82 km (51 mi) NNW of here earthquakes near Isabela Municipio
Quebradillas Municipio, PR 87 km (54 mi) NNW of here earthquakes near Quebradillas Municipio
Camuy Municipio, PR 91 km (57 mi) NNW of here earthquakes near Camuy Municipio
Aguada Municipio, PR 93 km (58 mi) N of here earthquakes near Aguada Municipio
Moca Municipio, PR 93 km (58 mi) N of here earthquakes near Moca Municipio

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

Aftershocks so far

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

  1. 3.8 Mona Passage
  2. 2.5 77 km NW of San Antonio, Puerto Rico
  3. 3.6 80 km NW of San Antonio, Puerto Rico
  4. 3.5 93 km NNW of San Antonio, Puerto Rico
  5. 2.8 75 km NW of San Antonio, Puerto Rico
  6. 3.2 81 km NW of San Antonio, Puerto Rico
  7. 3.3 77 km NW of San Antonio, Puerto Rico
  8. 3.2 90 km NNW of San Antonio, Puerto Rico
  9. 3.5 79 km NNW of San Antonio, Puerto Rico
  10. 3.6 106 km NNW of San Antonio, Puerto Rico
  11. 3.4 87 km NNW of San Antonio, Puerto Rico
  12. 3.4 81 km NW of San Antonio, Puerto Rico
  13. 3.6 74 km NW of San Antonio, Puerto Rico
  14. 3.3 81 km NW of San Antonio, Puerto Rico
  15. 3.4 98 km NW 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 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.