QuakeIndex

Earthquake · reviewed by a seismologist

M 3.0md

Puerto Rico region

Yes. A magnitude 3.0 earthquake was recorded in the Puerto Rico region, at 7:22 am AST on 28 June 2019 (11:22 UTC), 85 km deep.

· 85 km deep · released about 890 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 3.0 (md)
Depth
85 km below the surface
Felt
no reports yet
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 2615 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 890 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 4.0 would have released about 32 times as much.

  1. Northridge, California 1994 M 6.7 380,000× the energy of this one
  2. Mineral, Virginia 2011 M 5.8 17,000× the energy of this one
  3. Magna, Utah 2020 M 5.7 12,000× the energy of this one
  4. This earthquake M 3.0 about 890 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.

For this area

The largest earthquake within 50 km in our catalogue was M 4.9 on 2018-11-14 — about 760 times the energy of this one.

Since 2016: the QuakeIndex catalogue (US, M1.5+), built from the USGS FDSN event service. Before 2016: USGS ComCat, M5+ from 1900. Distances are between epicentres. This is the record, not a forecast.

Where

Epicentre 19.5568, -65.4370. Map © OpenStreetMap contributors.

Aftershocks so far

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

  1. 2.8 84 km NNE of Vieques, Puerto Rico
  2. 3.0 119 km N of Charlotte Amalie, U.S. Virgin Islands
  3. 2.7 98 km N of Culebra, Puerto Rico
  4. 3.1 95 km NNE of Luquillo, Puerto Rico
  5. 2.6 104 km N of Suárez, Puerto Rico
  6. 2.9 86 km NNE of Vieques, Puerto Rico
  7. 2.9 117 km NNE of Vieques, Puerto Rico
  8. 3.1 109 km NNE of Vieques, Puerto Rico
  9. 3.1 138 km N of Charlotte Amalie, U.S. Virgin Islands
  10. 2.9 88 km N of Suárez, Puerto Rico
  11. 3.1 133 km NNE of Vieques, Puerto Rico
  12. 3.2 137 km NNE of Vieques, Puerto Rico
  13. 2.5 138 km NNE of Suárez, Puerto Rico
  14. 2.8 126 km NNW of Charlotte Amalie, U.S. Virgin Islands
  15. 3.3 126 km NNE of Vieques, 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.