QuakeIndex

Earthquake · reviewed by a seismologist

M 3.5md

171 km NNW of San Antonio, Puerto Rico

· 40 km deep · released about 2.5 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 3.5 (md)
Depth
40 km below the surface
Felt
no reports yet
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 1984 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 2.5 tons of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 4.5 would have released about 32 times as much.

  1. Northridge, California 1994 M 6.7 68,000× the energy of this one
  2. Mineral, Virginia 2011 M 5.8 3,000× the energy of this one
  3. Magna, Utah 2020 M 5.7 2,100× the energy of this one
  4. This earthquake M 3.5 about 2.5 tons of TNT
  5. Around the size people start to feel M 3.0 this one released 5.2× 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 19.9843, -67.5476. Map © OpenStreetMap contributors.

Aftershocks so far

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

  1. 3.7 140 km NNE of Punta Cana, Dominican Republic
  2. 3.8 135 km NNE of Punta Cana, Dominican Republic
  3. 3.5 132 km NNW of San Antonio, Puerto Rico
  4. 3.5 135 km NNW of San Antonio, Puerto Rico
  5. 3.8 130 km NNW of San Antonio, Puerto Rico
  6. 3.6 Mona Passage
  7. 3.4 167 km N of San Antonio, Puerto Rico
  8. 3.8 138 km NNW of San Antonio, Puerto Rico
  9. 3.4 159 km NNW of San Antonio, Puerto Rico
  10. 3.5 129 km NNW of San Antonio, Puerto Rico
  11. 3.9 134 km NNW of San Antonio, Puerto Rico
  12. 3.8 130 km NNW of San Antonio, Puerto Rico
  13. 3.4 133 km NNW of San Antonio, 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.