QuakeIndex

Earthquake · reviewed by a seismologist

M 2.7Md

Puerto Rico region

Yes. A magnitude 2.7 earthquake was recorded in the Puerto Rico region, at 3:44 pm AST on 5 October 2016 (19:44 UTC), 79 km deep.

· 79 km deep · released about 340 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N
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 2.7 (Md)
Depth
79 km below the surface
Felt
no reports yet
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 3600 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 340 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 3.7 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 45,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 32,000× the energy of this one
  3. Around the size people start to feel M 3.0 2.8× the energy of this one
  4. This earthquake M 2.7 about 340 lb of TNT

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 19.6005, -65.4383. Map © OpenStreetMap contributors.

Aftershocks so far

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

  1. 3.4 Puerto Rico region
  2. 3.3 123 km N of Charlotte Amalie, U.S. Virgin Islands
  3. 2.8 117 km N of Charlotte Amalie, U.S. Virgin Islands
  4. 3.1 98 km NNE of Vieques, Puerto Rico
  5. 3.4 138 km NNW of Charlotte Amalie, U.S. Virgin Islands
  6. 3.4 102 km N of Culebra, Puerto Rico
  7. 3.4 122 km N of Charlotte Amalie, U.S. Virgin Islands
  8. 3.2 125 km N of Charlotte Amalie, U.S. Virgin Islands
  9. 3.4 120 km N of Charlotte Amalie, U.S. Virgin Islands
  10. 3.2 140 km NNE of Vieques, Puerto Rico
  11. 3.5 104 km NNE of Vieques, Puerto Rico
  12. 3.1 112 km NNW of Charlotte Amalie, U.S. Virgin Islands
  13. 3.2 113 km N of Charlotte Amalie, U.S. Virgin Islands
  14. 4.2 112 km N of Charlotte Amalie, U.S. Virgin Islands
  15. 3.0 104 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.

On USGS

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