QuakeIndex

Earthquake · reviewed by a seismologist

M 3.6md

0 km ENE of Pájaros, Puerto Rico

· 112 km deep · released about 4.1 tons of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Toa Alta Municipio 4 kmBayamón Municipio 5 kmToa Baja Municipio 10 kmNaranjito Municipio 10 kmCataño Municipio 10 kmGuaynabo Municipio 10 kmDorado Municipio 13 kmCorozal Municipio 14 kmVega Alta 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 3.6 (md)
Depth
112 km below the surface
Felt
1 report · strongest reported intensity II
Nearest
Toa Alta Municipio, 4 km WSW
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 1162 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 4.1 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 42,000× the energy of this one
  2. Mineral, Virginia 2011 M 5.8 1,900× the energy of this one
  3. Magna, Utah 2020 M 5.7 1,300× the energy of this one
  4. This earthquake M 3.6 about 4.1 tons of TNT
  5. Around the size people start to feel M 3.0 this one released 8.5× 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 18.3716, -66.2093. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Toa Alta Municipio, PR 4 km (2 mi) ENE of here earthquakes near Toa Alta Municipio
Bayamón Municipio, PR 5 km (3 mi) WNW of here earthquakes near Bayamón Municipio
Toa Baja Municipio, PR 10 km (6 mi) S of here earthquakes near Toa Baja Municipio
Naranjito Municipio, PR 10 km (6 mi) NNE of here earthquakes near Naranjito Municipio
Cataño Municipio, PR 10 km (6 mi) SW of here earthquakes near Cataño Municipio
Guaynabo Municipio, PR 10 km (7 mi) WNW of here earthquakes near Guaynabo Municipio

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

Aftershocks so far

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

  1. 2.8 1 km SSW of Cidra, Puerto Rico
  2. 2.3 4 km SSE of Salinas, Puerto Rico
  3. 2.7 5 km SSE of Salinas, Puerto Rico
  4. 2.5 Puerto Rico region
  5. 2.3 Puerto Rico region
  6. 3.2 2 km NNW of San Juan, Puerto Rico
  7. 2.6 3 km SSE of Salinas, Puerto Rico
  8. 3.6 Puerto Rico region
  9. 2.3 5 km SSE of Salinas, Puerto Rico
  10. 2.4 3 km SSE of Salinas, Puerto Rico
  11. 2.3 Puerto Rico region
  12. 3.3 4 km ENE of Guaynabo, Puerto Rico
  13. 2.6 8 km S of Orocovis, Puerto Rico
  14. 2.3 3 km S of Las Ochenta, Puerto Rico
  15. 2.4 4 km WSW of Central Aguirre, 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 2019-03-12 — it released about 30 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.