QuakeIndex

Earthquake · reviewed by a seismologist

M 3.9md

113 km N of Suárez, Puerto Rico

· 111 km deep · released about 9 tons of TNT

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10 km30 km60 km120 km N Loíza Municipio 114 kmFajardo Municipio 117 kmRío Grande Municipio 119 kmLuquillo Municipio 119 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 3.9 (md)
Depth
111 km below the surface
Felt
no reports yet
Nearest
Loíza Municipio, 114 km SSW
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 1219 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 9 tons of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 4.8 would have released about 32 times as much.

  1. Northridge, California 1994 M 6.7 19,000× the energy of this one
  2. Mineral, Virginia 2011 M 5.8 840× the energy of this one
  3. Magna, Utah 2020 M 5.7 600× the energy of this one
  4. This earthquake M 3.9 about 9 tons of TNT
  5. Around the size people start to feel M 3.0 this one released 19× 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 19.4393, -65.6695. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Loíza Municipio, PR 114 km (71 mi) NNE of here earthquakes near Loíza Municipio
Fajardo Municipio, PR 117 km (73 mi) N of here earthquakes near Fajardo Municipio
Río Grande Municipio, PR 119 km (74 mi) N of here earthquakes near Río Grande Municipio
Luquillo Municipio, PR 119 km (74 mi) N of here earthquakes near Luquillo Municipio
Carolina Municipio, PR 120 km (75 mi) NNE of here earthquakes near Carolina Municipio
San Juan Municipio, PR 121 km (75 mi) NNE of here earthquakes near San Juan Municipio

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

Aftershocks so far

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

  1. 3.8 133 km N of Suárez, Puerto Rico
  2. 2.8 84 km NNE of Luquillo, Puerto Rico
  3. 3.9 129 km N of Suárez, Puerto Rico
  4. 3.7 Puerto Rico region
  5. 3.7 139 km N of Suárez, Puerto Rico
  6. 3.8 136 km N of Suárez, Puerto Rico
  7. 3.9 130 km N of Suárez, Puerto Rico
  8. 3.7 136 km N of Suárez, Puerto Rico
  9. 3.9 130 km N of Suárez, Puerto Rico
  10. 2.5 123 km N of Suárez, Puerto Rico
  11. 3.8 124 km N of Su?rez, Puerto Rico
  12. 3.8 142 km N of Suárez, Puerto Rico
  13. 3.8 Puerto Rico region
  14. 4.0 132 km N of Suárez, Puerto Rico
  15. 3.9 135 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 4.5 on 2018-03-06 — it released about 9.4 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.