QuakeIndex

Earthquake · reviewed by a seismologist

M 3.1Md

76 km N of San Juan, Puerto Rico

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

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10 km30 km60 km120 km N Dorado Municipio 80 kmToa Baja Municipio 80 kmLoíza Municipio 80 kmCataño Municipio 80 kmSan Juan Municipio 82 kmCarolina Municipio 85 kmVega Alta Municipio 86 kmVega Baja Municipio 87 kmRío Grande Municipio 91 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
30 km below the surface
Felt
no reports yet
Nearest
Dorado Municipio, 80 km SSW
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 3554 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 19.1590, -66.0442. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Dorado Municipio, PR 80 km (49 mi) NNE of here earthquakes near Dorado Municipio
Toa Baja Municipio, PR 80 km (49 mi) NNE of here earthquakes near Toa Baja Municipio
Loíza Municipio, PR 80 km (50 mi) N of here earthquakes near Loíza Municipio
Cataño Municipio, PR 80 km (50 mi) N of here earthquakes near Cataño Municipio
San Juan Municipio, PR 82 km (51 mi) N of here earthquakes near San Juan Municipio
Carolina Municipio, PR 85 km (53 mi) N of here earthquakes near Carolina Municipio

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

Aftershocks so far

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

  1. 2.9 42 km N of Brenas, Puerto Rico
  2. 2.7 44 km N of San Juan, Puerto Rico
  3. 3.0 55 km N of San Juan, Puerto Rico
  4. 3.2 67 km N of San Juan, Puerto Rico
  5. 2.6 46 km NNE of San Juan, Puerto Rico
  6. 2.8 106 km N of San Juan, Puerto Rico
  7. 2.5 75 km NNE of Vieques, Puerto Rico
  8. 3.0 88 km N of San Juan, Puerto Rico
  9. 3.2 111 km N of Brenas, Puerto Rico
  10. 2.8 71 km N of Tierras Nuevas Poniente, Puerto Rico
  11. 2.1 46 km NNE of Suárez, Puerto Rico
  12. 2.8 53 km N of Suárez, Puerto Rico
  13. 3.2 73 km N of San Juan, Puerto Rico
  14. 3.0 74 km N of San Juan, Puerto Rico
  15. 3.2 73 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.