QuakeIndex

Earthquake · reviewed by a seismologist

M 3.7md

4 km SW of Ramos, Puerto Rico

· 131 km deep · released about 5.2 tons of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Luquillo Municipio 7 kmRío Grande Municipio 9 kmNaguabo Municipio 12 kmCanóvanas Municipio 15 kmCeiba Municipio 15 kmFajardo Municipio 19 kmLas Piedras Municipio 19 kmJuncos Municipio 20 kmHumacao Municipio 21 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
131 km below the surface
Felt
no reports yet
Measured shaking
intensity III (ShakeMap)
Nearest
Luquillo Municipio, 7 km NE
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 853 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 5.2 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 33,000× the energy of this one
  2. Mineral, Virginia 2011 M 5.8 1,500× the energy of this one
  3. Magna, Utah 2020 M 5.7 1,000× the energy of this one
  4. This earthquake M 3.7 about 5.2 tons of TNT
  5. Around the size people start to feel M 3.0 this one released 11× 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 18.3163, -65.7486. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Luquillo Municipio, PR 7 km (4 mi) SW of here earthquakes near Luquillo Municipio
Río Grande Municipio, PR 9 km (5 mi) SE of here earthquakes near Río Grande Municipio
Naguabo Municipio, PR 12 km (7 mi) N of here earthquakes near Naguabo Municipio
Canóvanas Municipio, PR 15 km (9 mi) E of here earthquakes near Canóvanas Municipio
Ceiba Municipio, PR 15 km (9 mi) WNW of here earthquakes near Ceiba Municipio
Fajardo Municipio, PR 19 km (12 mi) WSW of here earthquakes near Fajardo Municipio

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

Aftershocks so far

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

  1. 2.2 6 km SSE of Bajandas, Puerto Rico
  2. 3.3 5 km SSE of Bajandas, Puerto Rico
  3. 3.2 0 km ENE of Cidra, Puerto Rico
  4. 3.0 6 km SSE of Bajandas, Puerto Rico
  5. 3.4 1 km S of Canovanas, Puerto Rico
  6. 3.1 6 km NNW of Yaurel, Puerto Rico
  7. 2.7 11 km SE of Emajagua, Puerto Rico
  8. 3.0 11 km SE of Esperanza, Puerto Rico
  9. 2.5 3 km SW of G. L. Garcia, Puerto Rico
  10. 2.8 10 km SW of Esperanza, Puerto Rico
  11. 2.2 0 km SSE of Isabel Segunda, Puerto Rico
  12. 2.5 5 km SE of El Negro, Puerto Rico
  13. 3.1 3 km NE of Martorell, Puerto Rico
  14. 2.8 1 km ESE of Gurabo, Puerto Rico
  15. 3.0 31 km NE of Vieques, 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 2016-12-05 — it released about 23 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.