QuakeIndex

Earthquake · reviewed by a seismologist

M 3.1md

1 km S of Toa Alta, Puerto Rico

· 65 km deep · released about 1,400 lb of TNT

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10 km30 km60 km120 km N Toa Alta Municipio 1 kmBayamón Municipio 9 kmNaranjito Municipio 10 kmToa Baja Municipio 11 kmDorado Municipio 11 kmVega Alta Municipio 11 kmCorozal Municipio 12 kmCataño Municipio 13 kmGuaynabo 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 3.1 (md)
Depth
65 km below the surface
Felt
2 reports · strongest reported intensity II
Nearest
Toa Alta Municipio, 1 km SSE
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 595 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 1,400 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 4.1 would have released about 32 times as much.

  1. Northridge, California 1994 M 6.7 240,000× the energy of this one
  2. Mineral, Virginia 2011 M 5.8 11,000× the energy of this one
  3. Magna, Utah 2020 M 5.7 7,700× the energy of this one
  4. This earthquake M 3.1 about 1,400 lb of TNT
  5. Around the size people start to feel M 3.0 this one released 1.5× 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 18.3777, -66.2478. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Toa Alta Municipio, PR 1 km (1 mi) NNW of here earthquakes near Toa Alta Municipio
Bayamón Municipio, PR 9 km (6 mi) WNW of here earthquakes near Bayamón Municipio
Naranjito Municipio, PR 10 km (6 mi) N of here earthquakes near Naranjito Municipio
Toa Baja Municipio, PR 11 km (7 mi) SSW of here earthquakes near Toa Baja Municipio
Dorado Municipio, PR 11 km (7 mi) S of here earthquakes near Dorado Municipio
Vega Alta Municipio, PR 11 km (7 mi) SE of here earthquakes near Vega Alta Municipio

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

Aftershocks so far

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

  1. 2.4 1 km ESE of Coto Laurel, Puerto Rico
  2. 2.9 9 km NNW of Brenas, Puerto Rico
  3. 1.6 2 km S of G. L. Garcia, Puerto Rico
  4. 2.8 19 km N of Dorado, Puerto Rico
  5. 2.2 1 km W of Naranjito, Puerto Rico
  6. 2.2 3 km ESE of G. L. Garcia, Puerto Rico
  7. 2.9 2 km NW of Orocovis, Puerto Rico
  8. 2.1 3 km WNW of Guayabal, Puerto Rico
  9. 2.4 4 km SW of Las Piedras, Puerto Rico
  10. 2.0 3 km W of Orocovis, Puerto Rico
  11. 2.2 4 km SSW of Las Piedras, Puerto Rico
  12. 2.1 4 km SSW of Las Piedras, Puerto Rico
  13. 2.6 3 km SSW of Las Piedras, Puerto Rico
  14. 2.1 4 km SSE of Juncos, Puerto Rico
  15. 2.4 5 km SSW of Las Piedras, 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 4.4 on 2018-12-09 — it released about 86 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.