QuakeIndex

Earthquake · reviewed by a seismologist

M 3.7md

4 km E of Punta Santiago, Puerto Rico

· 14 km deep · released about 5.5 tons of TNT

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10 km30 km60 km120 km N Naguabo Municipio 6 kmHumacao Municipio 10 kmCeiba Municipio 13 kmLas Piedras Municipio 18 kmYabucoa Municipio 20 kmLuquillo Municipio 23 kmJuncos Municipio 23 kmRío Grande Municipio 26 kmCanóvanas Municipio 27 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 3.7 (md)
Depth
14 km below the surface
Felt
3 reports · strongest reported intensity II
Nearest
Naguabo Municipio, 6 km NW
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 1426 days ago

This was a small earthquake. Shaking like this is often felt indoors nearby and very rarely causes damage. 3 people have reported feeling it to USGS.

How big was it?

This earthquake released about 5.5 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 31,000× the energy of this one
  2. Mineral, Virginia 2011 M 5.8 1,400× the energy of this one
  3. Magna, Utah 2020 M 5.7 970× the energy of this one
  4. This earthquake M 3.7 about 5.5 tons of TNT
  5. Around the size people start to feel M 3.0 this one released 12× 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 18.1656, -65.7015. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Naguabo Municipio, PR 6 km (4 mi) SE of here earthquakes near Naguabo Municipio
Humacao Municipio, PR 10 km (6 mi) ENE of here earthquakes near Humacao Municipio
Ceiba Municipio, PR 13 km (8 mi) SW of here earthquakes near Ceiba Municipio
Las Piedras Municipio, PR 18 km (11 mi) E of here earthquakes near Las Piedras Municipio
Yabucoa Municipio, PR 20 km (13 mi) NE of here earthquakes near Yabucoa Municipio
Luquillo Municipio, PR 23 km (14 mi) S of here earthquakes near Luquillo Municipio

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

Aftershocks so far

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

  1. 2.3 Puerto Rico region
  2. 1.9 9 km SSW of Emajagua, Puerto Rico
  3. 3.1 Puerto Rico region
  4. 3.3 16 km NW of Culebra, Puerto Rico
  5. 3.3 15 km S of Esperanza, Puerto Rico
  6. 2.8 16 km S of Lamboglia, Puerto Rico
  7. 2.5 12 km SE of Esperanza, Puerto Rico
  8. 2.8 Puerto Rico region
  9. 2.9 Puerto Rico region
  10. 2.4 5 km ESE of Punta Santiago, Puerto Rico
  11. 2.8 28 km SE of Emajagua, Puerto Rico
  12. 3.2 24 km SW of Esperanza, Puerto Rico
  13. 3.3 3 km SE of Trujillo Alto, Puerto Rico
  14. 2.5 6 km S of Esperanza, Puerto Rico
  15. 3.4 25 km NNE of Playa Fortuna, 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 4.8 on 2021-10-08 — it released about 43 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.