QuakeIndex

Earthquake · reviewed by a seismologist

M 3.4md

101 km NNE of Suárez, Puerto Rico

· 39 km deep · released about 1.8 tons of TNT

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10 km30 km60 km120 km N Loíza Municipio 103 kmFajardo Municipio 105 kmRío Grande Municipio 107 kmLuquillo Municipio 107 kmCarolina Municipio 109 kmSan Juan Municipio 110 kmCataño Municipio 111 kmToa Baja Municipio 112 kmCanóvanas Municipio 114 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
39 km below the surface
Felt
1 report · strongest reported intensity III
Nearest
Loíza Municipio, 103 km SSW
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 2227 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 1.8 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 92,000× the energy of this one
  2. Mineral, Virginia 2011 M 5.8 4,100× the energy of this one
  3. Magna, Utah 2020 M 5.7 2,900× the energy of this one
  4. This earthquake M 3.4 about 1.8 tons of TNT
  5. Around the size people start to feel M 3.0 this one released 3.8× 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 19.3300, -65.6651. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Loíza Municipio, PR 103 km (64 mi) NNE of here earthquakes near Loíza Municipio
Fajardo Municipio, PR 105 km (65 mi) N of here earthquakes near Fajardo Municipio
Río Grande Municipio, PR 107 km (66 mi) N of here earthquakes near Río Grande Municipio
Luquillo Municipio, PR 107 km (67 mi) N of here earthquakes near Luquillo Municipio
Carolina Municipio, PR 109 km (67 mi) NNE of here earthquakes near Carolina Municipio
San Juan Municipio, PR 110 km (68 mi) NNE of here earthquakes near San Juan Municipio

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

Aftershocks so far

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

  1. 3.4 99 km N of Culebra, Puerto Rico
  2. 3.3 113 km NNE of San Juan, Puerto Rico
  3. 3.7 107 km N of Suárez, Puerto Rico
  4. 3.5 127 km N of Suárez, Puerto Rico
  5. 3.5 78 km NNE of Luquillo, Puerto Rico
  6. 3.4 101 km N of Culebra, Puerto Rico
  7. 3.3 82 km N of Culebra, Puerto Rico
  8. 3.2 77 km NNE of Vieques, Puerto Rico
  9. 3.2 94 km N of Suárez, Puerto Rico
  10. 3.2 112 km N of Suárez, Puerto Rico
  11. 3.2 74 km NNE of Vieques, Puerto Rico
  12. 3.4 113 km N of Suárez, Puerto Rico
  13. 3.4 106 km NNW of Charlotte Amalie, U.S. Virgin Islands
  14. 2.9 84 km NNE of Luquillo, Puerto Rico
  15. 3.1 80 km NNE of Luquillo, 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 4.5 on 2018-03-06 — it released about 46 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.