QuakeIndex

Earthquake · reviewed by a seismologist

M 3.4md

129 km SSE of Boca de Yuma, Dominican Republic

Yes. A magnitude 3.4 earthquake was recorded 129 km SSE of Boca de Yuma, Dominican Republic, at 4:16 am AST on 17 July 2018 (08:16 UTC), 64 km deep.

· 64 km deep · released about 1.9 tons of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Mayagüez Municipio 107 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
64 km below the surface
Felt
no reports yet
Nearest
Mayagüez Municipio, 107 km NNE
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 2961 days ago

This was a small earthquake. Shaking like this is often felt indoors nearby and very rarely causes damage.

At this magnitude and depth it was probably too small to be felt, even directly above it. Estimated from magnitude, depth and distance with the intensity equation USGS Did You Feel It? uses; felt reports, where there are any, are the measurement.

How big was it?

This earthquake released about 1.9 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 89,000× the energy of this one
  2. Mineral, Virginia 2011 M 5.8 4,000× the energy of this one
  3. Magna, Utah 2020 M 5.7 2,800× the energy of this one
  4. This earthquake M 3.4 about 1.9 tons of TNT
  5. Around the size people start to feel M 3.0 this one released 4× 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 17.2371, -68.3598. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection from the epicentre
Mayagüez Municipio, PR 107 km (66 mi) NNE earthquakes near Mayagüez Municipio

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

Aftershocks so far

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

  1. 4.3 102 km WSW of Pole Ojea, Puerto Rico
  2. 3.6 83 km SSE of Boca de Yuma, Dominican Republic
  3. 3.4 103 km WSW of Pole Ojea, Puerto Rico
  4. 3.1 140 km SSE of Boca de Yuma, Dominican Republic
  5. 3.8 150 km SSE of Boca de Yuma, Dominican Republic
  6. 3.4 127 km SW of Pole Ojea, Puerto Rico
  7. 3.4 88 km SSE of Boca de Yuma, Dominican Republic
  8. 3.9 Dominican Republic region
  9. 4.1 116 km S of Boca de Yuma, Dominican Republic
  10. 4.0 140 km SSE of Boca de Yuma, Dominican Republic
  11. 3.1 102 km SW of Pole Ojea, Puerto Rico
  12. 2.5 88 km SSE of Boca de Yuma, Dominican Republic
  13. 3.4 120 km SSE of Boca de Yuma, Dominican Republic
  14. 3.4 145 km S of Boca de Yuma, Dominican Republic
  15. 3.5 116 km SW of Pole Ojea, 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.

On USGS

QuakeIndex does not issue warnings. For earthquake early warning see ShakeAlert.