QuakeIndex

Earthquake · reviewed by a seismologist

M 3.9md

40 km WNW of Rincón, Puerto Rico

· 104 km deep · released about 11 tons of TNT

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10 km30 km60 km120 km N Rincón Municipio 40 kmAguada Municipio 45 kmAguadilla Municipio 47 kmAñasco Municipio 54 kmMayagüez Municipio 55 kmMoca Municipio 56 kmIsabela Municipio 61 kmHormigueros Municipio 64 kmSan Sebastián Municipio 68 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 3.9 (md)
Depth
104 km below the surface
Felt
3 reports · strongest reported intensity IV
Nearest
Rincón Municipio, 40 km ESE
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 2010 days ago

This was a small earthquake. Shaking like this is often felt indoors nearby and very rarely causes damage. 3 people have reported feeling it to USGS.

How big was it?

This earthquake released about 11 tons of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 4.9 would have released about 32 times as much.

  1. Northridge, California 1994 M 6.7 15,000× the energy of this one
  2. Mineral, Virginia 2011 M 5.8 660× the energy of this one
  3. Magna, Utah 2020 M 5.7 470× the energy of this one
  4. This earthquake M 3.9 about 11 tons of TNT
  5. Around the size people start to feel M 3.0 this one released 24× 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 18.4976, -67.5925. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Rincón Municipio, PR 40 km (25 mi) WNW of here earthquakes near Rincón Municipio
Aguada Municipio, PR 45 km (28 mi) WNW of here earthquakes near Aguada Municipio
Aguadilla Municipio, PR 47 km (29 mi) W of here earthquakes near Aguadilla Municipio
Añasco Municipio, PR 54 km (34 mi) WNW of here earthquakes near Añasco Municipio
Mayagüez Municipio, PR 55 km (34 mi) NE of here earthquakes near Mayagüez Municipio
Moca Municipio, PR 56 km (35 mi) WNW of here earthquakes near Moca Municipio

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

Aftershocks so far

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

  1. 3.2 Mona Passage
  2. 3.0 18 km WNW of Rincón, Puerto Rico
  3. 3.4 53 km NW of San Antonio, Puerto Rico
  4. 3.4 27 km NW of Rincón, Puerto Rico
  5. 3.4 68 km NW of San Antonio, Puerto Rico
  6. 3.1 60 km NW of San Antonio, Puerto Rico
  7. 3.2 44 km NW of San Antonio, Puerto Rico
  8. 3.3 47 km ESE of Punta Cana, Dominican Republic
  9. 3.1 72 km NW of Aguadilla, Puerto Rico
  10. 2.8 34 km WNW of Rincón, Puerto Rico
  11. 3.4 71 km NW of Rincón, Puerto Rico
  12. 2.0 2 km NNE of Rincón, Puerto Rico
  13. 3.2 59 km W of Stella, Puerto Rico
  14. 3.6 50 km NW of Rincón, Puerto Rico
  15. 3.2 69 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 4.4 on 2017-10-01 — it released about 5.2 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.