QuakeIndex

Earthquake · reviewed by a seismologist

M 3.1md

121 km NNE of Vieques, Puerto Rico

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

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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
111 km below the surface
Felt
no reports yet
Nearest
Fajardo Municipio, 120 km S
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 2892 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 6.7 240,000× 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 7,700× 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 19.4581, -65.4320. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Fajardo Municipio, PR 120 km (75 mi) N of here earthquakes near Fajardo Municipio
Loíza Municipio, PR 125 km (78 mi) NNE of here earthquakes near Loíza Municipio
Carolina Municipio, PR 131 km (81 mi) NNE of here earthquakes near Carolina Municipio
San Juan Municipio, PR 133 km (83 mi) NNE of here earthquakes near San Juan Municipio
Cataño Municipio, PR 136 km (84 mi) NNE of here earthquakes near Cataño Municipio
Toa Baja Municipio, PR 137 km (85 mi) NE of here earthquakes near Toa Baja Municipio

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

Aftershocks so far

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

  1. 3.1 107 km N of Charlotte Amalie, U.S. Virgin Islands
  2. 3.3 133 km N of Charlotte Amalie, U.S. Virgin Islands
  3. 3.0 108 km N of Suárez, Puerto Rico
  4. 3.2 119 km N of Suárez, Puerto Rico
  5. 3.6 133 km NNE of Vieques, Puerto Rico
  6. 3.4 117 km N of Charlotte Amalie, U.S. Virgin Islands
  7. 3.2 86 km N of Suárez, Puerto Rico
  8. 3.5 126 km NNE of Suárez, Puerto Rico
  9. 2.6 134 km NNE of Vieques, Puerto Rico
  10. 3.4 93 km NNW of Charlotte Amalie, U.S. Virgin Islands
  11. 3.2 87 km N of Culebra, Puerto Rico
  12. 3.2 148 km N of Charlotte Amalie, U.S. Virgin Islands
  13. 4.9 143 km N of Charlotte Amalie, U.S. Virgin Islands
  14. 2.9 116 km NNE of Vieques, Puerto Rico
  15. 2.8 82 km N of Suárez, 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 4.5 on 2018-03-06 — it released about 120 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.