QuakeIndex

Earthquake · reviewed by a seismologist

M 3.4md

30 km NNE of Vieques, Puerto Rico

· 73 km deep · released about 2.1 tons of TNT

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10 km30 km60 km120 km N Loíza Municipio 35 kmRío Grande Municipio 35 kmLuquillo Municipio 35 kmFajardo Municipio 36 kmCarolina Municipio 41 kmCanóvanas Municipio 43 kmSan Juan Municipio 46 kmTrujillo Alto Municipio 49 kmCeiba Municipio 49 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 3.4 (md)
Depth
73 km below the surface
Felt
1 report · strongest reported intensity IV
Nearest
Loíza Municipio, 35 km SW
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 1330 days ago

This was a small earthquake. Shaking like this is often felt indoors nearby and very rarely causes damage. 1 person has reported feeling it to USGS.

How big was it?

This earthquake released about 2.1 tons of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 4.4 would have released about 32 times as much.

  1. Northridge, California 1994 M 6.7 80,000× the energy of this one
  2. Mineral, Virginia 2011 M 5.8 3,600× the energy of this one
  3. Magna, Utah 2020 M 5.7 2,500× the energy of this one
  4. This earthquake M 3.4 about 2.1 tons of TNT
  5. Around the size people start to feel M 3.0 this one released 4.4× 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 18.6853, -65.7290. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Loíza Municipio, PR 35 km (22 mi) NE of here earthquakes near Loíza Municipio
Río Grande Municipio, PR 35 km (22 mi) NNE of here earthquakes near Río Grande Municipio
Luquillo Municipio, PR 35 km (22 mi) N of here earthquakes near Luquillo Municipio
Fajardo Municipio, PR 36 km (23 mi) NNW of here earthquakes near Fajardo Municipio
Carolina Municipio, PR 41 km (25 mi) NE of here earthquakes near Carolina Municipio
Canóvanas Municipio, PR 43 km (27 mi) NNE of here earthquakes near Canóvanas Municipio

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

Aftershocks so far

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

  1. 3.4 79 km NNE of Vieques, Puerto Rico
  2. 3.2 63 km NNE of San Juan, Puerto Rico
  3. 3.1 6 km ENE of San Juan, Puerto Rico
  4. 3.4 Puerto Rico region
  5. 3.3 49 km N of San Juan, Puerto Rico
  6. 3.2 Puerto Rico region
  7. 3.4 3 km NNE of Benitez, Puerto Rico
  8. 2.8 0 km SSW of San Juan, Puerto Rico
  9. 3.1 68 km NNE of Suárez, Puerto Rico
  10. 2.7 2 km WNW of Campo Rico, Puerto Rico
  11. 2.8 45 km N of San Juan, Puerto Rico
  12. 2.8 1 km W of San Isidro, Puerto Rico
  13. 2.9 49 km NE of Luquillo, Puerto Rico
  14. 3.2 3 km NNW of San Juan, Puerto Rico
  15. 3.4 Puerto Rico region

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 4.8 on 2021-03-09 — it released about 110 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.