QuakeIndex

Earthquake · reviewed by a seismologist

M 2.9md

126 km N of San Juan, Puerto Rico

· 37 km deep · released about 630 lb 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 2.9 (md)
Depth
37 km below the surface
Felt
no reports yet
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 2552 days ago

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

How big was it?

This earthquake released about 630 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 3.9 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 24,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 17,000× the energy of this one
  3. Around the size people start to feel M 3.0 1.5× the energy of this one
  4. This earthquake M 2.9 about 630 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 19.6098, -66.1295. Map © OpenStreetMap contributors.

Aftershocks so far

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

  1. 3.4 84 km N of San Juan, 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. 3.2 112 km N of Suárez, Puerto Rico
  6. 3.4 105 km N of San Juan, Puerto Rico
  7. 3.3 83 km N of Brenas, Puerto Rico
  8. 3.5 119 km N of San Juan, Puerto Rico
  9. 3.5 118 km N of Brenas, Puerto Rico
  10. 3.8 150 km N of Tierras Nuevas Poniente, Puerto Rico
  11. 3.4 92 km N of San Juan, Puerto Rico
  12. 3.1 108 km NNE of San Juan, Puerto Rico
  13. 3.6 115 km N of Brenas, Puerto Rico
  14. 3.5 115 km N of Brenas, Puerto Rico
  15. 2.7 105 km N of San Juan, 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 190 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.