QuakeIndex

Earthquake · reviewed by a seismologist

M 3.1md

109 km N of San Juan, Puerto Rico

· 37 km deep · released about 1,400 lb of TNT

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10 km30 km60 km120 km N Dorado Municipio 109 kmToa Baja Municipio 111 kmCataño Municipio 112 kmVega Baja Municipio 114 kmLoíza Municipio 115 kmVega Alta Municipio 115 kmSan Juan Municipio 115 kmBarceloneta Municipio 117 kmManatí 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 3.1 (md)
Depth
37 km below the surface
Felt
no reports yet
Nearest
Dorado Municipio, 109 km S
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 2461 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 1,400 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 6.7 230,000× the energy of this one
  2. Mineral, Virginia 2011 M 5.8 10,000× the energy of this one
  3. Magna, Utah 2020 M 5.7 7,400× the energy of this one
  4. This earthquake M 3.1 about 1,400 lb of TNT
  5. Around the size people start to feel M 3.0 this one released 1.5× 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 19.4543, -66.1626. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Dorado Municipio, PR 109 km (68 mi) N of here earthquakes near Dorado Municipio
Toa Baja Municipio, PR 111 km (69 mi) N of here earthquakes near Toa Baja Municipio
Cataño Municipio, PR 112 km (70 mi) N of here earthquakes near Cataño Municipio
Vega Baja Municipio, PR 114 km (71 mi) NNE of here earthquakes near Vega Baja Municipio
Loíza Municipio, PR 115 km (71 mi) NNW of here earthquakes near Loíza Municipio
Vega Alta Municipio, PR 115 km (71 mi) N of here earthquakes near Vega Alta Municipio

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

Aftershocks so far

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

  1. 3.2 75 km N of Tierras Nuevas Poniente, Puerto Rico
  2. 3.2 72 km N of Brenas, Puerto Rico
  3. 3.2 77 km N of Tierras Nuevas Poniente, Puerto Rico
  4. 3.6 124 km N of Brenas, Puerto Rico
  5. 3.0 Puerto Rico region
  6. 3.2 80 km N of Loíza, Puerto Rico
  7. 3.5 110 km N of Suárez, Puerto Rico
  8. 3.6 127 km N of Suárez, Puerto Rico
  9. 3.4 84 km N of San Juan, Puerto Rico
  10. 3.3 113 km NNE of San Juan, Puerto Rico
  11. 3.7 107 km N of Suárez, Puerto Rico
  12. 3.2 94 km N of Suárez, Puerto Rico
  13. 3.2 112 km N of Suárez, Puerto Rico
  14. 2.7 69 km N of Brenas, Puerto Rico
  15. 3.1 77 km N of Brenas, 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 83 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.