QuakeIndex

Earthquake · reviewed by a seismologist

M 3.5md

1 km NNW of Trujillo Alto, Puerto Rico

· 125 km deep · released about 3.1 tons of TNT

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10 km30 km60 km120 km N Trujillo Alto Municipio 3 kmCarolina Municipio 6 kmSan Juan Municipio 9 kmGurabo Municipio 11 kmGuaynabo Municipio 11 kmLoíza Municipio 12 kmCanóvanas Municipio 14 kmBayamón Municipio 17 kmCataño Municipio 17 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 3.5 (md)
Depth
125 km below the surface
Felt
1 report · strongest reported intensity II
Nearest
Trujillo Alto Municipio, 3 km SSE
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 1446 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 3.1 tons of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 4.5 would have released about 32 times as much.

  1. Northridge, California 1994 M 6.7 55,000× the energy of this one
  2. Mineral, Virginia 2011 M 5.8 2,500× the energy of this one
  3. Magna, Utah 2020 M 5.7 1,700× the energy of this one
  4. This earthquake M 3.5 about 3.1 tons of TNT
  5. Around the size people start to feel M 3.0 this one released 6.5× 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 18.3635, -66.0098. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Trujillo Alto Municipio, PR 3 km (2 mi) NNW of here earthquakes near Trujillo Alto Municipio
Carolina Municipio, PR 6 km (4 mi) SW of here earthquakes near Carolina Municipio
San Juan Municipio, PR 9 km (6 mi) SE of here earthquakes near San Juan Municipio
Gurabo Municipio, PR 11 km (7 mi) NNW of here earthquakes near Gurabo Municipio
Guaynabo Municipio, PR 11 km (7 mi) E of here earthquakes near Guaynabo Municipio
Loíza Municipio, PR 12 km (7 mi) SW of here earthquakes near Loíza Municipio

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

Aftershocks so far

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

  1. 3.1 22 km NE of Luquillo, Puerto Rico
  2. 3.6 5 km E of Candelero Arriba, Puerto Rico
  3. 3.0 11 km NNW of Brenas, Puerto Rico
  4. 2.8 5 km NNW of Dorado, Puerto Rico
  5. 2.2 3 km N of Orocovis, Puerto Rico
  6. 2.3 2 km SE of Lamboglia, Puerto Rico
  7. 1.9 2 km SSE of Lamboglia, Puerto Rico
  8. 3.6 1 km NNW of San José, Puerto Rico
  9. 3.0 3 km ESE of Cayey, Puerto Rico
  10. 3.0 3 km E of Cayey, Puerto Rico
  11. 1.8 2 km SW of G. L. Garcia, Puerto Rico
  12. 3.0 10 km ENE of Luis M. Cintron, Puerto Rico
  13. 2.1 3 km ENE of Mariano Colón, Puerto Rico
  14. 2.7 4 km SE of Morovis, Puerto Rico
  15. 3.8 5 km ENE 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 4.1 on 2019-05-02 — it released about 6.9 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.