QuakeIndex

Earthquake · reviewed by a seismologist

M 3.4md

5 km SSW of Ramos, Puerto Rico

· 128 km deep · released about 1.7 tons of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Luquillo Municipio 8 kmNaguabo Municipio 10 kmRío Grande Municipio 11 kmCeiba Municipio 14 kmCanóvanas Municipio 16 kmLas Piedras Municipio 19 kmHumacao Municipio 19 kmFajardo Municipio 19 kmJuncos Municipio 20 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 3.4 (md)
Depth
128 km below the surface
Felt
3 reports · strongest reported intensity III
Nearest
Luquillo Municipio, 8 km NNE
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 1265 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 1.7 tons of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 4.4 would have released about 32 times as much.

  1. Northridge, California 1994 M 6.7 100,000× the energy of this one
  2. Mineral, Virginia 2011 M 5.8 4,600× the energy of this one
  3. Magna, Utah 2020 M 5.7 3,200× the energy of this one
  4. This earthquake M 3.4 about 1.7 tons of TNT
  5. Around the size people start to feel M 3.0 this one released 3.5× 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 18.2983, -65.7407. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Luquillo Municipio, PR 8 km (5 mi) SSW of here earthquakes near Luquillo Municipio
Naguabo Municipio, PR 10 km (6 mi) N of here earthquakes near Naguabo Municipio
Río Grande Municipio, PR 11 km (7 mi) SE of here earthquakes near Río Grande Municipio
Ceiba Municipio, PR 14 km (8 mi) WNW of here earthquakes near Ceiba Municipio
Canóvanas Municipio, PR 16 km (10 mi) ESE of here earthquakes near Canóvanas Municipio
Las Piedras Municipio, PR 19 km (12 mi) NE of here earthquakes near Las Piedras Municipio

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

Aftershocks so far

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

  1. 3.4 33 km NNW of Culebra, Puerto Rico
  2. 3.0 13 km N of Loíza, Puerto Rico
  3. 2.5 9 km SE of El Negro, Puerto Rico
  4. 2.8 4 km SE of G. L. Garcia, Puerto Rico
  5. 2.9 0 km NNW of Cataño, Puerto Rico
  6. 3.1 2 km SE of Cayey, Puerto Rico
  7. 3.4 1 km W of Punta Santiago, Puerto Rico
  8. 2.6 5 km SE of G. L. Garcia, Puerto Rico
  9. 2.2 3 km E of Bayamon, Puerto Rico
  10. 2.7 Puerto Rico region
  11. 2.9 1 km W of Punta Santiago, Puerto Rico
  12. 2.8 Puerto Rico region
  13. 2.9 9 km SSE of Bajandas, Puerto Rico
  14. 2.6 19 km SW of Esperanza, Puerto Rico
  15. 3.1 6 km ENE 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 4.8 on 2021-10-08 — it released about 140 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.