QuakeIndex

Earthquake · reviewed by a seismologist

M 3.6md

1 km SSE of Galateo, Puerto Rico

· 67 km deep · released about 4.5 tons of TNT

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10 km30 km60 km120 km N Toa Alta Municipio 2 kmNaranjito Municipio 7 kmBayamón Municipio 9 kmCorozal Municipio 9 kmVega Alta Municipio 13 kmToa Baja Municipio 13 kmDorado Municipio 14 kmComerío Municipio 14 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 3.6 (md)
Depth
67 km below the surface
Felt
31 reports · strongest reported intensity III
Measured shaking
intensity II (ShakeMap)
Nearest
Toa Alta Municipio, 2 km NNE
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 429 days ago

This was a small earthquake. Shaking like this is often felt indoors nearby and very rarely causes damage. 31 people have reported feeling it to USGS.

How big was it?

This earthquake released about 4.5 tons of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 4.7 would have released about 32 times as much.

  1. Northridge, California 1994 M 6.7 38,000× the energy of this one
  2. Mineral, Virginia 2011 M 5.8 1,700× the energy of this one
  3. Magna, Utah 2020 M 5.7 1,200× the energy of this one
  4. This earthquake M 3.6 about 4.5 tons of TNT
  5. Around the size people start to feel M 3.0 this one released 9.4× 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 18.3505, -66.2521. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Toa Alta Municipio, PR 2 km (1 mi) SSW of here earthquakes near Toa Alta Municipio
Naranjito Municipio, PR 7 km (4 mi) N of here earthquakes near Naranjito Municipio
Bayamón Municipio, PR 9 km (5 mi) W of here earthquakes near Bayamón Municipio
Corozal Municipio, PR 9 km (6 mi) ENE of here earthquakes near Corozal Municipio
Vega Alta Municipio, PR 13 km (8 mi) SE of here earthquakes near Vega Alta Municipio
Toa Baja Municipio, PR 13 km (8 mi) SSW of here earthquakes near Toa Baja Municipio

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

Aftershocks so far

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

  1. 3.0 7 km NNE of Dorado, Puerto Rico
  2. 2.0 2 km SSW of Las Ochenta, Puerto Rico
  3. 3.6 1 km ESE of Carolina, Puerto Rico
  4. 2.8 4 km N of San Antonio, Puerto Rico
  5. 2.0 0 km ENE of Santa Isabel, Puerto Rico
  6. 2.3 3 km N of Playita Cortada, Puerto Rico
  7. 2.2 1 km ESE of Santa Isabel, Puerto Rico
  8. 3.0 34 km N of Brenas, Puerto Rico
  9. 2.1 1 km ENE of Jauca, Puerto Rico
  10. 2.3 2 km ENE of Jauca, Puerto Rico
  11. 2.6 1 km WNW of Parcelas Peñuelas, Puerto Rico
  12. 2.5 1 km WSW of Parcelas Peñuelas, Puerto Rico
  13. 2.5 1 km WSW of Parcelas Peñuelas, Puerto Rico
  14. 2.4 1 km NNW of Parcelas Peñuelas, Puerto Rico
  15. 1.8 1 km E of Mariano Colón, 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 27 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.