QuakeIndex

Earthquake · reviewed by a seismologist

M 3.5md

21 km WNW of Puerto Real, Puerto Rico

· 10 km deep · released about 3.1 tons of TNT

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10 km30 km60 km120 km N Rincón Municipio 24 kmCabo Rojo Municipio 27 kmHormigueros Municipio 27 kmAñasco Municipio 29 kmAguada Municipio 31 kmSan Germán Municipio 36 kmMoca Municipio 39 kmLajas Municipio 41 kmLas Marías Municipio 42 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 3.5 (md)
Depth
10 km below the surface
Felt
1 report · strongest reported intensity IV
Measured shaking
intensity II (ShakeMap)
Nearest
Rincón Municipio, 24 km NNE
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 1717 days ago

This was a small earthquake. Shaking like this is often felt indoors nearby and very rarely causes damage. 1 person has reported feeling it to USGS.

How big was it?

This earthquake released about 3.1 tons of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 4.5 would have released about 32 times as much.

  1. Northridge, California 1994 M 6.7 55,000× the energy of this one
  2. Mineral, Virginia 2011 M 5.8 2,500× the energy of this one
  3. Magna, Utah 2020 M 5.7 1,700× the energy of this one
  4. This earthquake M 3.5 about 3.1 tons of TNT
  5. Around the size people start to feel M 3.0 this one released 6.5× 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 18.1603, -67.3723. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Rincón Municipio, PR 24 km (15 mi) SSW of here earthquakes near Rincón Municipio
Cabo Rojo Municipio, PR 27 km (17 mi) NW of here earthquakes near Cabo Rojo Municipio
Hormigueros Municipio, PR 27 km (17 mi) W of here earthquakes near Hormigueros Municipio
Añasco Municipio, PR 29 km (18 mi) WSW of here earthquakes near Añasco Municipio
Aguada Municipio, PR 31 km (19 mi) SW of here earthquakes near Aguada Municipio
San Germán Municipio, PR 36 km (22 mi) W of here earthquakes near San Germán Municipio

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

Aftershocks so far

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

  1. 2.5 6 km WSW of La Parguera, Puerto Rico
  2. 3.2 5 km SW of Stella, Puerto Rico
  3. 2.3 5 km W of Fuig, Puerto Rico
  4. 2.8 4 km ESE of La Parguera, Puerto Rico
  5. 1.6 9 km SE of La Parguera, Puerto Rico
  6. 3.1 44 km W of Puerto Real, Puerto Rico
  7. 2.0 7 km SE of La Parguera, Puerto Rico
  8. 1.5 6 km WSW of Fuig, Puerto Rico
  9. 3.6 59 km W of Rincón, Puerto Rico
  10. 2.7 5 km ENE of La Parguera, Puerto Rico
  11. 2.7 6 km WSW of Fuig, Puerto Rico
  12. 3.0 5 km WSW of La Parguera, Puerto Rico
  13. 3.2 6 km WSW of La Parguera, Puerto Rico
  14. 1.8 6 km WSW of La Parguera, Puerto Rico
  15. 2.5 4 km WSW of Fuig, 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 5.3 on 2020-07-03 — it released about 440 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.