QuakeIndex

Earthquake · reviewed by a seismologist

M 3.6md

100 km N of Brenas, Puerto Rico

· 11 km deep · released about 3.9 tons of TNT

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10 km30 km60 km120 km N Dorado Municipio 101 kmVega Baja Municipio 103 kmBarceloneta Municipio 104 kmToa Baja Municipio 104 kmVega Alta Municipio 105 kmManatí Municipio 105 kmCataño Municipio 106 kmSan Juan Municipio 110 kmArecibo Municipio 111 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 3.6 (md)
Depth
11 km below the surface
Felt
no reports yet
Nearest
Dorado Municipio, 101 km S
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 1345 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 3.9 tons of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 4.6 would have released about 32 times as much.

  1. Northridge, California 1994 M 6.7 43,000× the energy of this one
  2. Mineral, Virginia 2011 M 5.8 1,900× the energy of this one
  3. Magna, Utah 2020 M 5.7 1,400× the energy of this one
  4. This earthquake M 3.6 about 3.9 tons of TNT
  5. Around the size people start to feel M 3.0 this one released 8.2× 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 19.3793, -66.3450. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Dorado Municipio, PR 101 km (63 mi) N of here earthquakes near Dorado Municipio
Vega Baja Municipio, PR 103 km (64 mi) N of here earthquakes near Vega Baja Municipio
Barceloneta Municipio, PR 104 km (64 mi) NNE of here earthquakes near Barceloneta Municipio
Toa Baja Municipio, PR 104 km (64 mi) N of here earthquakes near Toa Baja Municipio
Vega Alta Municipio, PR 105 km (65 mi) N of here earthquakes near Vega Alta Municipio
Manatí Municipio, PR 105 km (65 mi) N of here earthquakes near Manatí Municipio

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

Aftershocks so far

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

  1. 3.1 68 km N of Brenas, Puerto Rico
  2. 3.2 75 km N of Tierras Nuevas Poniente, Puerto Rico
  3. 3.2 71 km N of Arecibo, Puerto Rico
  4. 3.4 77 km N of Arecibo, Puerto Rico
  5. 3.2 80 km N of Arecibo, Puerto Rico
  6. 3.4 81 km N of Tierras Nuevas Poniente, Puerto Rico
  7. 3.0 55 km N of Tierras Nuevas Poniente, Puerto Rico
  8. 3.6 74 km N of Tierras Nuevas Poniente, Puerto Rico
  9. 3.3 91 km N of Arecibo, Puerto Rico
  10. 3.4 94 km N of Arecibo, Puerto Rico
  11. 3.3 92 km N of Arecibo, Puerto Rico
  12. 3.4 79 km N of Arecibo, Puerto Rico
  13. 3.3 85 km N of Tierras Nuevas Poniente, Puerto Rico
  14. 3.5 Puerto Rico region
  15. 3.5 83 km N of Tierras Nuevas Poniente, 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 4.8 on 2017-08-18 — it released about 61 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.