QuakeIndex

Earthquake · reviewed by a seismologist

M 3.8md

Puerto Rico region

· 56 km deep · released about 6.6 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 3.8 (md)
Depth
56 km below the surface
Felt
1 report · strongest reported intensity I
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 1688 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 6.6 tons of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 4.8 would have released about 32 times as much.

  1. Northridge, California 1994 M 6.7 26,000× the energy of this one
  2. Mineral, Virginia 2011 M 5.8 1,100× the energy of this one
  3. Magna, Utah 2020 M 5.7 810× the energy of this one
  4. This earthquake M 3.8 about 6.6 tons of TNT
  5. Around the size people start to feel M 3.0 this one released 14× 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 19.9100, -65.9763. Map © OpenStreetMap contributors.

Aftershocks so far

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

  1. 3.4 144 km N of Suárez, Puerto Rico
  2. 3.8 134 km N of Su?rez, Puerto Rico
  3. 3.8 121 km N of Suárez, Puerto Rico
  4. 3.3 153 km N of Suárez, Puerto Rico
  5. 3.7 139 km N of Suárez, Puerto Rico
  6. 4.1 139 km N of Suárez, Puerto Rico
  7. 4.1 132 km N of Suárez, Puerto Rico
  8. 4.0 Puerto Rico region
  9. 4.1 141 km N of Suárez, Puerto Rico
  10. 4.0 128 km N of Suárez, Puerto Rico
  11. 3.9 124 km N of Suárez, Puerto Rico
  12. 3.4 132 km N of Suárez, Puerto Rico
  13. 3.9 138 km N of Suárez, Puerto Rico
  14. 3.4 Puerto Rico region
  15. 3.6 135 km N of Suárez, 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 4.4 on 2016-10-23 — it released about 9.1 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.