QuakeIndex

Earthquake · reviewed by a seismologist

M 3.4md

80 km NW of San Antonio, Puerto Rico

· 4.8 km deep · released about 1.9 tons of TNT

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10 km30 km60 km120 km N Aguadilla Municipio 78 kmRincón Municipio 83 kmAguada Municipio 84 kmIsabela Municipio 88 kmMoca Municipio 91 kmAñasco Municipio 95 kmQuebradillas Municipio 96 kmMayagüez Municipio 101 kmSan Sebastián Municipio 103 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 3.4 (md)
Depth
4.8 km below the surface
Felt
no reports yet
Nearest
Aguadilla Municipio, 78 km SE
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 1418 days ago

This was a small earthquake. Shaking like this is often felt indoors nearby and very rarely causes damage.

How big was it?

This earthquake released about 1.9 tons of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 4.4 would have released about 32 times as much.

  1. Northridge, California 1994 M 6.7 89,000× the energy of this one
  2. Mineral, Virginia 2011 M 5.8 4,000× the energy of this one
  3. Magna, Utah 2020 M 5.7 2,800× the energy of this one
  4. This earthquake M 3.4 about 1.9 tons of TNT
  5. Around the size people start to feel M 3.0 this one released 4× 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 18.9662, -67.6767. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Aguadilla Municipio, PR 78 km (48 mi) NW of here earthquakes near Aguadilla Municipio
Rincón Municipio, PR 83 km (52 mi) NNW of here earthquakes near Rincón Municipio
Aguada Municipio, PR 84 km (52 mi) NW of here earthquakes near Aguada Municipio
Isabela Municipio, PR 88 km (55 mi) NW of here earthquakes near Isabela Municipio
Moca Municipio, PR 91 km (56 mi) NW of here earthquakes near Moca Municipio
Añasco Municipio, PR 95 km (59 mi) NW of here earthquakes near Añasco Municipio

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

Aftershocks so far

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

  1. 3.0 68 km NW of San Antonio, Puerto Rico
  2. 3.7 77 km NNW of San Antonio, Puerto Rico
  3. 4.2 80 km NNW of San Antonio, Puerto Rico
  4. 3.0 40 km NW of San Antonio, Puerto Rico
  5. 3.4 44 km NW of San Antonio, Puerto Rico
  6. 3.5 91 km NE of Punta Cana, Dominican Republic
  7. 3.8 75 km NE of Punta Cana, Dominican Republic
  8. 3.7 97 km NNE of Punta Cana, Dominican Republic
  9. 3.9 79 km NE of Punta Cana, Dominican Republic
  10. 4.4 98 km NE of Punta Cana, Dominican Republic
  11. 3.2 41 km NW of San Antonio, Puerto Rico
  12. 3.6 79 km NE of Punta Cana, Dominican Republic
  13. 3.4 48 km NNW of San Antonio, Puerto Rico
  14. 3.5 44 km NW of San Antonio, Puerto Rico
  15. 3.7 Mona Passage

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 7,900 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.