QuakeIndex

Earthquake · reviewed by a seismologist

M 3.1Md

54 km N of Brenas, Puerto Rico

· 35 km deep · released about 1,300 lb of TNT

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10 km30 km60 km120 km N Dorado Municipio 53 kmToa Baja Municipio 56 kmVega Baja Municipio 57 kmVega Alta Municipio 58 kmCataño Municipio 58 kmManatí Municipio 61 kmBarceloneta Municipio 61 kmSan Juan Municipio 63 kmToa Alta Municipio 66 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 3.1 (Md)
Depth
35 km below the surface
Felt
no reports yet
Nearest
Dorado Municipio, 53 km S
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 3534 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 1,300 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 4.1 would have released about 32 times as much.

  1. Northridge, California 1994 M 6.7 250,000× the energy of this one
  2. Mineral, Virginia 2011 M 5.8 11,000× the energy of this one
  3. Magna, Utah 2020 M 5.7 7,900× the energy of this one
  4. This earthquake M 3.1 about 1,300 lb of TNT
  5. Around the size people start to feel M 3.0 this one released 1.4× 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 18.9535, -66.2810. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Dorado Municipio, PR 53 km (33 mi) N of here earthquakes near Dorado Municipio
Toa Baja Municipio, PR 56 km (35 mi) N of here earthquakes near Toa Baja Municipio
Vega Baja Municipio, PR 57 km (35 mi) NNE of here earthquakes near Vega Baja Municipio
Vega Alta Municipio, PR 58 km (36 mi) N of here earthquakes near Vega Alta Municipio
Cataño Municipio, PR 58 km (36 mi) NNW of here earthquakes near Cataño Municipio
Manatí Municipio, PR 61 km (38 mi) NNE of here earthquakes near Manatí 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. 2.5 20 km NNE of San Juan, Puerto Rico
  2. 2.5 22 km N of Tierras Nuevas Poniente, Puerto Rico
  3. 2.8 61 km N of Tierras Nuevas Poniente, Puerto Rico
  4. 2.6 49 km N of Tierras Nuevas Poniente, Puerto Rico
  5. 3.1 Puerto Rico region
  6. 3.2 73 km N of San Juan, Puerto Rico
  7. 3.0 74 km N of San Juan, Puerto Rico
  8. 3.2 73 km N of San Juan, Puerto Rico
  9. 3.1 20 km N of Dorado, Puerto Rico
  10. 2.8 70 km N of San Juan, Puerto Rico
  11. 3.4 78 km N of Carrizales, Puerto Rico
  12. 2.4 61 km N of San Juan, Puerto Rico
  13. 2.9 70 km N of San Juan, Puerto Rico
  14. 2.9 78 km N of Brenas, Puerto Rico
  15. 2.6 75 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.

On USGS

QuakeIndex does not issue warnings. For earthquake early warning see ShakeAlert.