QuakeIndex

Earthquake · reviewed by a seismologist

M 3.2md

34 km NNE of San Juan, Puerto Rico

· 47 km deep · released about 1.1 tons of TNT

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10 km30 km60 km120 km N Loíza Municipio 34 kmSan Juan Municipio 38 kmCataño Municipio 38 kmCarolina Municipio 39 kmToa Baja Municipio 40 kmDorado Municipio 43 kmRío Grande Municipio 46 kmTrujillo Alto Municipio 46 kmGuaynabo Municipio 47 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 3.2 (md)
Depth
47 km below the surface
Felt
2 reports · strongest reported intensity IV
Nearest
Loíza Municipio, 34 km S
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 655 days ago

This was a small earthquake. Shaking like this is often felt indoors nearby and very rarely causes damage. 2 people have reported feeling it to USGS.

How big was it?

This earthquake released about 1.1 tons of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 4.2 would have released about 32 times as much.

  1. Northridge, California 1994 M 6.7 160,000× the energy of this one
  2. Mineral, Virginia 2011 M 5.8 7,200× the energy of this one
  3. Magna, Utah 2020 M 5.7 5,100× the energy of this one
  4. This earthquake M 3.2 about 1.1 tons of TNT
  5. Around the size people start to feel M 3.0 this one released 2.2× 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 18.7503, -65.9815. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Loíza Municipio, PR 34 km (21 mi) N of here earthquakes near Loíza Municipio
San Juan Municipio, PR 38 km (23 mi) NNE of here earthquakes near San Juan Municipio
Cataño Municipio, PR 38 km (24 mi) NNE of here earthquakes near Cataño Municipio
Carolina Municipio, PR 39 km (24 mi) N of here earthquakes near Carolina Municipio
Toa Baja Municipio, PR 40 km (25 mi) NE of here earthquakes near Toa Baja Municipio
Dorado Municipio, PR 43 km (26 mi) NE of here earthquakes near Dorado Municipio

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

Aftershocks so far

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

  1. 3.0 50 km N of Loíza, Puerto Rico
  2. 3.0 52 km N of Loíza, Puerto Rico
  3. 2.6 3 km ESE of Cataño, Puerto Rico
  4. 3.1 1 km S of Campanilla, Puerto Rico
  5. 3.1 79 km N of San Juan, Puerto Rico
  6. 3.5 78 km N of San Juan, Puerto Rico
  7. 3.3 68 km N of San Juan, Puerto Rico
  8. 3.0 5 km NNW of Dorado, Puerto Rico
  9. 2.8 47 km N of Brenas, Puerto Rico
  10. 3.0 42 km N of San Juan, Puerto Rico
  11. 2.7 27 km NNW of Brenas, Puerto Rico
  12. 3.3 67 km N of San Juan, Puerto Rico
  13. 3.0 12 km NNW of San Juan, Puerto Rico
  14. 2.8 53 km NNW of San Juan, Puerto Rico
  15. 3.1 2 km NW of Hato Candal, 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 4.8 on 2017-08-18 — it released about 230 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.