QuakeIndex

Earthquake · reviewed by a seismologist

M 3.4md

56 km NNW of San Antonio, Puerto Rico

· 21 km deep · released about 1.6 tons of TNT

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10 km30 km60 km120 km N Aguadilla Municipio 56 kmIsabela Municipio 63 kmAguada Municipio 65 kmRincón Municipio 67 kmMoca Municipio 69 kmQuebradillas Municipio 70 kmAñasco Municipio 76 kmCamuy Municipio 77 kmSan Sebastián Municipio 80 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
21 km below the surface
Felt
no reports yet
Nearest
Aguadilla Municipio, 56 km SSE
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 745 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 1.6 tons of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 4.3 would have released about 32 times as much.

  1. Northridge, California 1994 M 6.7 110,000× the energy of this one
  2. Mineral, Virginia 2011 M 5.8 4,700× the energy of this one
  3. Magna, Utah 2020 M 5.7 3,300× the energy of this one
  4. This earthquake M 3.4 about 1.6 tons of TNT
  5. Around the size people start to feel M 3.0 this one released 3.3× 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 18.9312, -67.3798. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Aguadilla Municipio, PR 56 km (35 mi) NNW of here earthquakes near Aguadilla Municipio
Isabela Municipio, PR 63 km (39 mi) NW of here earthquakes near Isabela Municipio
Aguada Municipio, PR 65 km (40 mi) NNW of here earthquakes near Aguada Municipio
Rincón Municipio, PR 67 km (42 mi) NNW of here earthquakes near Rincón Municipio
Moca Municipio, PR 69 km (43 mi) NNW of here earthquakes near Moca Municipio
Quebradillas Municipio, PR 70 km (44 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

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

  1. 3.1 55 km NW of San Antonio, Puerto Rico
  2. 3.2 24 km N of San Antonio, Puerto Rico
  3. 3.9 89 km NE of Punta Cana, Dominican Republic
  4. 2.8 44 km NNE of Isabela, Puerto Rico
  5. 2.7 35 km NW of Aguadilla, Puerto Rico
  6. 3.6 70 km NNW of San Antonio, Puerto Rico
  7. 3.3 53 km NW of San Antonio, Puerto Rico
  8. 3.2 83 km NW of San Antonio, Puerto Rico
  9. 3.3 90 km NNW of San Antonio, Puerto Rico
  10. 3.4 69 km NW of San Antonio, Puerto Rico
  11. 3.2 40 km NW of Aguadilla, Puerto Rico
  12. 3.1 72 km NW of San Antonio, Puerto Rico
  13. 3.5 90 km NNW of San Antonio, Puerto Rico
  14. 3.1 63 km NNW of San Antonio, Puerto Rico
  15. 3.7 98 km NNW 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 9,400 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.