QuakeIndex

Earthquake · reviewed by a seismologist

M 3.7md

135 km NNE of Vieques, Puerto Rico

· 42 km deep · released about 5.2 tons of TNT

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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 3.7 (md)
Depth
42 km below the surface
Felt
1 report · strongest reported intensity III
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 499 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 5.2 tons of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 4.7 would have released about 32 times as much.

  1. Northridge, California 1994 M 6.7 33,000× the energy of this one
  2. Mineral, Virginia 2011 M 5.8 1,500× the energy of this one
  3. Magna, Utah 2020 M 5.7 1,000× the energy of this one
  4. This earthquake M 3.7 about 5.2 tons of TNT
  5. Around the size people start to feel M 3.0 this one released 11× 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 19.5538, -65.3250. Map © OpenStreetMap contributors.

Aftershocks so far

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

  1. 3.6 126 km N of Charlotte Amalie, U.S. Virgin Islands
  2. 3.4 112 km N of Charlotte Amalie, U.S. Virgin Islands
  3. 3.3 105 km N of Charlotte Amalie, U.S. Virgin Islands
  4. 3.4 114 km N of Charlotte Amalie, U.S. Virgin Islands
  5. 3.3 116 km N of Charlotte Amalie, U.S. Virgin Islands
  6. 4.0 105 km N of Suárez, Puerto Rico
  7. 3.5 96 km N of Charlotte Amalie, U.S. Virgin Islands
  8. 3.8 104 km NNW of Charlotte Amalie, U.S. Virgin Islands
  9. 3.6 116 km NNW of Charlotte Amalie, U.S. Virgin Islands
  10. 3.7 122 km N of Culebra, Puerto Rico
  11. 3.3 146 km N of Charlotte Amalie, U.S. Virgin Islands
  12. 3.4 133 km NNE of Vieques, Puerto Rico
  13. 3.8 102 km NNW of Charlotte Amalie, U.S. Virgin Islands
  14. 3.5 131 km N of Suárez, Puerto Rico
  15. 3.4 125 km N of Charlotte Amalie, U.S. Virgin Islands

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 4.9 on 2018-11-14 — it released about 65 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.