QuakeIndex

Earthquake · reviewed by a seismologist

M 3.4md

3 km NNE of Las Marias, Puerto Rico

· 7.0 km deep · released about 1.8 tons of TNT

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10 km30 km60 km120 km N Añasco Municipio 4 kmAguada Municipio 8 kmMoca Municipio 9 kmRincón Municipio 13 kmSan Sebastián Municipio 17 kmAguadilla Municipio 18 kmLas Marías Municipio 19 kmHormigueros Municipio 21 kmIsabela Municipio 22 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
7.0 km below the surface
Felt
2 reports · strongest reported intensity III
Nearest
Añasco Municipio, 4 km S
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 3182 days ago

This was a small earthquake. Shaking like this is often felt indoors nearby and very rarely causes damage. 2 people have reported feeling it to USGS.

How big was it?

This earthquake released about 1.8 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 95,000× the energy of this one
  2. Mineral, Virginia 2011 M 5.8 4,300× the energy of this one
  3. Magna, Utah 2020 M 5.7 3,000× the energy of this one
  4. This earthquake M 3.4 about 1.8 tons of TNT
  5. Around the size people start to feel M 3.0 this one released 3.7× 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 18.3183, -67.1341. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Añasco Municipio, PR 4 km (2 mi) N of here earthquakes near Añasco Municipio
Aguada Municipio, PR 8 km (5 mi) SE of here earthquakes near Aguada Municipio
Moca Municipio, PR 9 km (5 mi) SW of here earthquakes near Moca Municipio
Rincón Municipio, PR 13 km (8 mi) E of here earthquakes near Rincón Municipio
San Sebastián Municipio, PR 17 km (11 mi) W of here earthquakes near San Sebastián Municipio
Aguadilla Municipio, PR 18 km (11 mi) S of here earthquakes near Aguadilla Municipio

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

Aftershocks so far

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

  1. 2.5 16 km SW of Stella, Puerto Rico
  2. 1.9 Mona Passage
  3. 2.2 Puerto Rico region
  4. 3.1 17 km NW of Rincón, Puerto Rico
  5. 2.6 Mona Passage
  6. 2.2 2 km S of Guánica, Puerto Rico
  7. 2.7 21 km SW of Stella, Puerto Rico
  8. 1.6 0 km SE of Fuig, Puerto Rico
  9. 2.0 15 km SSW of Stella, Puerto Rico
  10. 2.7 11 km E of Maricao, Puerto Rico
  11. 1.7 2 km SE of Maria Antonia, Puerto Rico
  12. 2.3 3 km WNW of Santo Domingo, Puerto Rico
  13. 2.7 19 km NW of San Antonio, Puerto Rico
  14. 2.5 11 km WNW of Puerto Real, Puerto Rico
  15. 2.2 5 km NNW of Puerto Real, 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 4.3 on 2017-10-14 — it released about 24 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.