QuakeIndex

Earthquake · reviewed by a seismologist

M 3.6Md

20 km NNW of Loíza, Puerto Rico

· 75 km deep · released about 3.8 tons of TNT

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10 km30 km60 km120 km N Loíza Municipio 18 kmCarolina Municipio 23 kmSan Juan Municipio 24 kmCataño Municipio 27 kmToa Baja Municipio 30 kmRío Grande Municipio 30 kmTrujillo Alto Municipio 31 kmCanóvanas Municipio 32 kmGuaynabo Municipio 34 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 3.6 (Md)
Depth
75 km below the surface
Felt
4 reports · strongest reported intensity III
Nearest
Loíza Municipio, 18 km S
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 3440 days ago

This was a small earthquake. Shaking like this is often felt indoors nearby and very rarely causes damage. 4 people have reported feeling it to USGS.

How big was it?

This earthquake released about 3.8 tons of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 4.6 would have released about 32 times as much.

  1. Northridge, California 1994 M 6.7 45,000× the energy of this one
  2. Mineral, Virginia 2011 M 5.8 2,000× the energy of this one
  3. Magna, Utah 2020 M 5.7 1,400× the energy of this one
  4. This earthquake M 3.6 about 3.8 tons of TNT
  5. Around the size people start to feel M 3.0 this one released 7.9× 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 18.6070, -65.9540. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Loíza Municipio, PR 18 km (11 mi) N of here earthquakes near Loíza Municipio
Carolina Municipio, PR 23 km (15 mi) N of here earthquakes near Carolina Municipio
San Juan Municipio, PR 24 km (15 mi) NNE of here earthquakes near San Juan Municipio
Cataño Municipio, PR 27 km (17 mi) NE of here earthquakes near Cataño Municipio
Toa Baja Municipio, PR 30 km (19 mi) ENE of here earthquakes near Toa Baja Municipio
Río Grande Municipio, PR 30 km (19 mi) NNW of here earthquakes near Río Grande 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. 2.4 3 km SW of Río Lajas, Puerto Rico
  2. 3.0 4 km ENE of Guaynabo, Puerto Rico
  3. 2.1 52 km NNE of Luquillo, Puerto Rico
  4. 2.8 10 km NNE of Dorado, Puerto Rico
  5. 2.7 3 km SE of Pájaros, Puerto Rico
  6. 2.9 47 km NNE of San Juan, Puerto Rico
  7. 2.7 10 km N of Brenas, Puerto Rico
  8. 2.5 17 km N of Loíza, Puerto Rico
  9. 2.6 27 km NNE of Luquillo, Puerto Rico
  10. 2.9 8 km ENE of San Juan, Puerto Rico
  11. 3.1 1 km SE of Ceiba, Puerto Rico
  12. 2.8 26 km NNE of Luquillo, Puerto Rico
  13. 2.8 4 km NE of San Juan, Puerto Rico
  14. 2.9 6 km SW of Guaynabo, Puerto Rico
  15. 2.4 35 km NE of Luquillo, 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.

On USGS

QuakeIndex does not issue warnings. For earthquake early warning see ShakeAlert.