QuakeIndex

Earthquake · reviewed by a seismologist

M 3.9md

111 km N of Brenas, Puerto Rico

· 32 km deep · released about 10 tons of TNT

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10 km30 km60 km120 km N Dorado Municipio 111 kmToa Baja Municipio 113 kmVega Baja Municipio 114 kmCataño Municipio 115 kmVega Alta Municipio 116 kmBarceloneta Municipio 116 kmManatí Municipio 117 kmSan Juan Municipio 118 kmLoíza Municipio 118 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
32 km below the surface
Felt
no reports yet
Nearest
Dorado Municipio, 111 km S
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 960 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 10 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 16,000× the energy of this one
  2. Mineral, Virginia 2011 M 5.8 730× the energy of this one
  3. Magna, Utah 2020 M 5.7 520× the energy of this one
  4. This earthquake M 3.9 about 10 tons of TNT
  5. Around the size people start to feel M 3.0 this one released 22× 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 19.4731, -66.2395. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Dorado Municipio, PR 111 km (69 mi) N of here earthquakes near Dorado Municipio
Toa Baja Municipio, PR 113 km (70 mi) N of here earthquakes near Toa Baja Municipio
Vega Baja Municipio, PR 114 km (71 mi) N of here earthquakes near Vega Baja Municipio
Cataño Municipio, PR 115 km (71 mi) N of here earthquakes near Cataño Municipio
Vega Alta Municipio, PR 116 km (72 mi) N of here earthquakes near Vega Alta Municipio
Barceloneta Municipio, PR 116 km (72 mi) NNE of here earthquakes near Barceloneta Municipio

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

Aftershocks so far

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

  1. 3.3 88 km N of Brenas, Puerto Rico
  2. 3.0 79 km N of Arecibo, Puerto Rico
  3. 3.6 105 km N of Suárez, Puerto Rico
  4. 3.3 68 km N of Brenas, Puerto Rico
  5. 3.4 97 km N of Arecibo, Puerto Rico
  6. 3.2 69 km N of Tierras Nuevas Poniente, Puerto Rico
  7. 2.8 69 km N of San Juan, Puerto Rico
  8. 3.7 97 km N of Brenas, Puerto Rico
  9. 3.6 108 km NNE of San Juan, Puerto Rico
  10. 3.0 69 km N of Brenas, Puerto Rico
  11. 3.6 119 km N of San Juan, Puerto Rico
  12. 3.5 75 km NNE of San Juan, Puerto Rico
  13. 3.2 66 km N of San Juan, Puerto Rico
  14. 3.3 92 km N of Tierras Nuevas Poniente, Puerto Rico
  15. 3.2 67 km N of San Juan, 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 2016-10-23 — it released about 5.8 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.