QuakeIndex

Earthquake · reviewed by a seismologist

M 3.1md

77 km N of Suárez, Puerto Rico

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

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10 km30 km60 km120 km N Loíza Municipio 78 kmRío Grande Municipio 83 kmCarolina Municipio 84 kmSan Juan Municipio 84 kmFajardo Municipio 84 kmLuquillo Municipio 85 kmCataño Municipio 86 kmToa Baja Municipio 87 kmDorado Municipio 89 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
30 km below the surface
Felt
no reports yet
Nearest
Loíza Municipio, 78 km SSW
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 1516 days ago

This was a small earthquake. Shaking like this is often felt indoors nearby and very rarely causes damage.

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 6.7 230,000× the energy of this one
  2. Mineral, Virginia 2011 M 5.8 10,000× the energy of this one
  3. Magna, Utah 2020 M 5.7 7,400× 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 19.1263, -65.7688. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Loíza Municipio, PR 78 km (48 mi) NNE of here earthquakes near Loíza Municipio
Río Grande Municipio, PR 83 km (52 mi) N of here earthquakes near Río Grande Municipio
Carolina Municipio, PR 84 km (52 mi) NNE of here earthquakes near Carolina Municipio
San Juan Municipio, PR 84 km (52 mi) NNE of here earthquakes near San Juan Municipio
Fajardo Municipio, PR 84 km (52 mi) NNW of here earthquakes near Fajardo Municipio
Luquillo Municipio, PR 85 km (53 mi) N of here earthquakes near Luquillo Municipio

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

Aftershocks so far

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

  1. 3.8 118 km N of Suárez, Puerto Rico
  2. 3.9 98 km NNE of San Juan, Puerto Rico
  3. 3.7 119 km N of Suárez, Puerto Rico
  4. 3.5 116 km NNE of Suárez, Puerto Rico
  5. 3.3 102 km N of San Juan, Puerto Rico
  6. 3.4 80 km N of Brenas, Puerto Rico
  7. 4.1 125 km N of Suárez, Puerto Rico
  8. 3.1 79 km NNE of Vieques, Puerto Rico
  9. 3.6 80 km NNE of Vieques, Puerto Rico
  10. 3.5 74 km NNE of Vieques, Puerto Rico
  11. 3.4 30 km NNE of Vieques, Puerto Rico
  12. 3.4 42 km NNE of Luquillo, Puerto Rico
  13. 3.2 73 km N of Culebra, Puerto Rico
  14. 3.4 59 km N of San Juan, Puerto Rico
  15. 3.7 124 km N of Suárez, 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 4.3 on 2016-09-04 — it released about 59 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.