QuakeIndex

Earthquake · reviewed by a seismologist

M 3.3md

3 km SE of Trujillo Alto, Puerto Rico

· 113 km deep · released about 1.1 tons of TNT

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10 km30 km60 km120 km N Trujillo Alto Municipio 2 kmGurabo Municipio 7 kmCarolina Municipio 7 kmCanóvanas Municipio 10 kmLoíza Municipio 13 kmSan Juan Municipio 13 kmGuaynabo Municipio 14 kmJuncos Municipio 15 kmCaguas Municipio 15 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
113 km below the surface
Felt
1 report · strongest reported intensity II
Nearest
Trujillo Alto Municipio, 2 km W
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 1317 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 1.1 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 6.7 150,000× the energy of this one
  2. Mineral, Virginia 2011 M 5.8 6,700× the energy of this one
  3. Magna, Utah 2020 M 5.7 4,700× the energy of this one
  4. This earthquake M 3.3 about 1.1 tons of TNT
  5. Around the size people start to feel M 3.0 this one released 2.4× 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 18.3343, -65.9845. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Trujillo Alto Municipio, PR 2 km (1 mi) E of here earthquakes near Trujillo Alto Municipio
Gurabo Municipio, PR 7 km (4 mi) N of here earthquakes near Gurabo Municipio
Carolina Municipio, PR 7 km (4 mi) SSW of here earthquakes near Carolina Municipio
Canóvanas Municipio, PR 10 km (6 mi) W of here earthquakes near Canóvanas Municipio
Loíza Municipio, PR 13 km (8 mi) SSW of here earthquakes near Loíza Municipio
San Juan Municipio, PR 13 km (8 mi) SE of here earthquakes near San Juan Municipio

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

Aftershocks so far

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

  1. 3.4 3 km NNE of Benitez, Puerto Rico
  2. 2.8 0 km SSW of San Juan, Puerto Rico
  3. 2.5 0 km N of Vázquez, Puerto Rico
  4. 2.9 2 km NNW of Punta Santiago, Puerto Rico
  5. 2.1 6 km NE of Orocovis, Puerto Rico
  6. 2.3 10 km S of Emajagua, Puerto Rico
  7. 2.7 2 km WNW of Campo Rico, Puerto Rico
  8. 3.0 3 km WSW of La Plena, Puerto Rico
  9. 2.6 6 km SSW of Lamboglia, Puerto Rico
  10. 2.8 Puerto Rico region
  11. 2.2 Puerto Rico region
  12. 3.1 Puerto Rico region
  13. 2.8 1 km W of San Isidro, Puerto Rico
  14. 2.0 1 km SSW of Vázquez, Puerto Rico
  15. 3.2 3 km NNW 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 4.6 on 2016-12-05 — 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.