QuakeIndex

Earthquake · reviewed by a seismologist

M 3.9md

56 km WNW of Rincón, Puerto Rico

· 99 km deep · released about 11 tons of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Mayagüez Municipio 52 kmRincón Municipio 56 kmAguada Municipio 61 kmAguadilla Municipio 63 kmAñasco Municipio 70 kmMoca Municipio 72 kmIsabela Municipio 77 kmHormigueros Municipio 79 kmCabo Rojo Municipio 84 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
99 km below the surface
Felt
5 reports · strongest reported intensity III
Nearest
Mayagüez Municipio, 52 km SSW
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 1884 days ago

This was a small earthquake. Shaking like this is often felt indoors nearby and very rarely causes damage. 5 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 5.8 680× the energy of this one
  3. Magna, Utah 2020 M 5.7 480× 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 23× 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 18.5296, -67.7435. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Mayagüez Municipio, PR 52 km (32 mi) NNE of here earthquakes near Mayagüez Municipio
Rincón Municipio, PR 56 km (35 mi) WNW of here earthquakes near Rincón Municipio
Aguada Municipio, PR 61 km (38 mi) WNW of here earthquakes near Aguada Municipio
Aguadilla Municipio, PR 63 km (39 mi) W of here earthquakes near Aguadilla Municipio
Añasco Municipio, PR 70 km (43 mi) WNW of here earthquakes near Añasco Municipio
Moca Municipio, PR 72 km (45 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

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

  1. 2.6 35 km WSW of Stella, Puerto Rico
  2. 3.4 59 km NW of San Antonio, Puerto Rico
  3. 3.4 63 km W of Rincón, Puerto Rico
  4. 3.1 45 km NW of Aguadilla, Puerto Rico
  5. 3.6 59 km W of Rincón, Puerto Rico
  6. 3.6 57 km NE of Punta Cana, Dominican Republic
  7. 3.3 46 km WSW of Stella, Puerto Rico
  8. 3.2 29 km NNW of Rincón, Puerto Rico
  9. 3.4 50 km ESE of Punta Cana, Dominican Republic
  10. 3.2 49 km W of Rincón, Puerto Rico
  11. 3.2 48 km NW of San Antonio, Puerto Rico
  12. 3.2 37 km NW of San Antonio, Puerto Rico
  13. 3.3 44 km ENE of Punta Cana, Dominican Republic
  14. 2.7 26 km NW of Rincón, Puerto Rico
  15. 3.1 68 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 4.6 on 2020-01-29 — it released about 11 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.