QuakeIndex

Earthquake · reviewed by a seismologist

M 3.7md

120 km N of San Juan, Puerto Rico

· 42 km deep · released about 4.7 tons of TNT

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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 3.7 (md)
Depth
42 km below the surface
Felt
no reports yet
Nearest
Dorado Municipio, 120 km S
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 975 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 4.7 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 36,000× the energy of this one
  2. Mineral, Virginia 2011 M 5.8 1,600× the energy of this one
  3. Magna, Utah 2020 M 5.7 1,100× the energy of this one
  4. This earthquake M 3.7 about 4.7 tons of TNT
  5. Around the size people start to feel M 3.0 this one released 9.8× 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 19.5513, -66.1440. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Dorado Municipio, PR 120 km (75 mi) N of here earthquakes near Dorado Municipio
Isabela Municipio, PR 150 km (93 mi) NE of here earthquakes near Isabela Municipio
Aguadilla Municipio, PR 159 km (99 mi) NE of here earthquakes near Aguadilla 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. 3.3 88 km N of Brenas, Puerto Rico
  2. 3.6 105 km N of Suárez, Puerto Rico
  3. 3.9 123 km N of Suárez, Puerto Rico
  4. 3.6 123 km N of Suárez, Puerto Rico
  5. 3.7 97 km N of Brenas, Puerto Rico
  6. 3.6 108 km NNE of San Juan, Puerto Rico
  7. 3.6 119 km N of San Juan, Puerto Rico
  8. 3.6 124 km N of Suárez, Puerto Rico
  9. 3.3 92 km N of Tierras Nuevas Poniente, Puerto Rico
  10. 3.6 118 km N of Suárez, Puerto Rico
  11. 3.4 75 km N of San Juan, Puerto Rico
  12. 3.2 89 km N of Brenas, Puerto Rico
  13. 3.7 133 km N of Tierras Nuevas Poniente, Puerto Rico
  14. 3.5 106 km N of San Juan, Puerto Rico
  15. 3.7 111 km N of San Juan, 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 2016-10-23 — it released about 13 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.