QuakeIndex

Earthquake · reviewed by a seismologist

M 3.1md

110 km N of San Juan, Puerto Rico

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

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10 km30 km60 km120 km N Dorado Municipio 111 kmToa Baja Municipio 112 kmCataño Municipio 113 kmLoíza Municipio 115 kmSan Juan Municipio 116 kmVega Baja Municipio 116 kmVega Alta Municipio 117 kmCarolina Municipio 120 kmBarceloneta Municipio 120 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
29 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 216 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 6.7 270,000× the energy of this one
  2. Mineral, Virginia 2011 M 5.8 12,000× the energy of this one
  3. Magna, Utah 2020 M 5.7 8,500× 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 1.3× 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 19.4645, -66.1157. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Dorado Municipio, PR 111 km (69 mi) N of here earthquakes near Dorado Municipio
Toa Baja Municipio, PR 112 km (70 mi) N of here earthquakes near Toa Baja Municipio
Cataño Municipio, PR 113 km (71 mi) N of here earthquakes near Cataño Municipio
Loíza Municipio, PR 115 km (71 mi) N of here earthquakes near Loíza Municipio
San Juan Municipio, PR 116 km (72 mi) N of here earthquakes near San Juan Municipio
Vega Baja Municipio, PR 116 km (72 mi) NNE of here earthquakes near Vega Baja Municipio

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

Aftershocks so far

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

  1. 3.1 75 km N of Brenas, Puerto Rico
  2. 3.3 110 km N of Suárez, Puerto Rico
  3. 3.2 93 km N of San Juan, Puerto Rico
  4. 3.7 117 km N of San Juan, Puerto Rico
  5. 3.3 80 km N of San Juan, Puerto Rico
  6. 3.4 75 km N of San Juan, Puerto Rico
  7. 3.4 110 km N of Suárez, Puerto Rico
  8. 3.1 63 km N of San Juan, Puerto Rico
  9. 3.3 109 km N of Suárez, Puerto Rico
  10. 3.4 123 km N of Tierras Nuevas Poniente, Puerto Rico
  11. 3.4 110 km N of Suárez, Puerto Rico
  12. 3.3 113 km NNE of San Juan, Puerto Rico
  13. 3.4 121 km NNE of San Juan, Puerto Rico
  14. 3.6 95 km N of San Juan, Puerto Rico
  15. 3.4 108 km NNE 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 95 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.