QuakeIndex

Earthquake · reviewed by a seismologist

M 3.3md

116 km N of San Juan, Puerto Rico

· 30 km deep · released about 1.4 tons of TNT

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10 km30 km60 km120 km N Loíza 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 3.3 (md)
Depth
30 km below the surface
Felt
no reports yet
Nearest
Loíza Municipio, 118 km S
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 559 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 1.4 tons of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 4.3 would have released about 32 times as much.

  1. Northridge, California 1994 M 6.7 120,000× the energy of this one
  2. Mineral, Virginia 2011 M 5.8 5,200× the energy of this one
  3. Magna, Utah 2020 M 5.7 3,700× the energy of this one
  4. This earthquake M 3.3 about 1.4 tons of TNT
  5. Around the size people start to feel M 3.0 this one released 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 19.5037, -65.9137. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Loíza Municipio, PR 118 km (73 mi) N of here earthquakes near Loíza Municipio
Toa Baja Municipio, PR 120 km (75 mi) NNE of here earthquakes near Toa Baja Municipio
Dorado Municipio, PR 120 km (75 mi) NNE of here earthquakes near Dorado Municipio
Cataño Municipio, PR 120 km (75 mi) NNE of here earthquakes near Cataño Municipio
Vega Alta Municipio, PR 127 km (79 mi) NNE of here earthquakes near Vega Alta Municipio
Vega Baja Municipio, PR 127 km (79 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

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

  1. 4.0 105 km N of Suárez, Puerto Rico
  2. 3.3 93 km N of Brenas, Puerto Rico
  3. 3.1 81 km N of Brenas, Puerto Rico
  4. 3.7 107 km N of Suárez, Puerto Rico
  5. 3.2 96 km N of Brenas, Puerto Rico
  6. 3.0 96 km N of Brenas, Puerto Rico
  7. 3.5 131 km N of San Juan, Puerto Rico
  8. 3.2 96 km N of Brenas, Puerto Rico
  9. 3.5 131 km N of Suárez, Puerto Rico
  10. 3.8 100 km N of San Juan, Puerto Rico
  11. 3.2 75 km N of San Juan, Puerto Rico
  12. 3.2 89 km N of San Juan, Puerto Rico
  13. 3.6 99 km NNE of Vieques, Puerto Rico
  14. 3.2 73 km N of San Juan, Puerto Rico
  15. 3.1 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.

For this area

The largest earthquake within 50 km in our catalogue was M 4.4 on 2016-10-23 — it released about 42 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.