QuakeIndex

Earthquake · reviewed by a seismologist

M 3.4md

56 km N of Suárez, Puerto Rico

· 29 km deep · released about 1.7 tons of TNT

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10 km30 km60 km120 km N Loíza Municipio 56 kmCarolina Municipio 61 kmSan Juan Municipio 62 kmRío Grande Municipio 62 kmCataño Municipio 63 kmLuquillo Municipio 65 kmToa Baja Municipio 65 kmFajardo Municipio 67 kmCanóvanas Municipio 68 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
29 km below the surface
Felt
1 report · strongest reported intensity II
Nearest
Loíza Municipio, 56 km S
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 748 days ago

This was a small earthquake. Shaking like this is often felt indoors nearby and very rarely causes damage. 1 person has 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 18.9363, -65.8428. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Loíza Municipio, PR 56 km (35 mi) N of here earthquakes near Loíza Municipio
Carolina Municipio, PR 61 km (38 mi) NNE of here earthquakes near Carolina Municipio
San Juan Municipio, PR 62 km (38 mi) NNE of here earthquakes near San Juan Municipio
Río Grande Municipio, PR 62 km (39 mi) N of here earthquakes near Río Grande Municipio
Cataño Municipio, PR 63 km (39 mi) NNE of here earthquakes near Cataño Municipio
Luquillo Municipio, PR 65 km (40 mi) NNW of here earthquakes near Luquillo Municipio

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

Aftershocks so far

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

  1. 3.3 63 km N of Loíza, Puerto Rico
  2. 2.9 34 km N of San Juan, Puerto Rico
  3. 3.3 77 km NNE of Vieques, Puerto Rico
  4. 2.9 53 km NNE of Luquillo, Puerto Rico
  5. 3.2 9 km NNE of San Juan, Puerto Rico
  6. 2.9 44 km NNE of Luquillo, Puerto Rico
  7. 3.2 67 km N of Culebra, Puerto Rico
  8. 3.0 56 km NNE of Luquillo, Puerto Rico
  9. 2.7 56 km NNE of Luquillo, Puerto Rico
  10. 3.1 75 km N of San Juan, Puerto Rico
  11. 3.5 82 km NNE of Vieques, Puerto Rico
  12. 3.6 96 km NNE of Vieques, Puerto Rico
  13. 3.1 68 km N of San Juan, Puerto Rico
  14. 3.2 34 km NNE of San Juan, Puerto Rico
  15. 3.3 79 km N of Culebra, 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 2017-08-18 — 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.