QuakeIndex

Earthquake · reviewed by a seismologist

M 3.7md

121 km NNW of San Antonio, Puerto Rico

· 47 km deep · released about 5.4 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
47 km below the surface
Felt
1 report · strongest reported intensity I
Nearest
Aguadilla Municipio, 121 km SSE
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 1836 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 5.4 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 32,000× the energy of this one
  2. Mineral, Virginia 2011 M 5.8 1,400× 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 5.4 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 19.4850, -67.5826. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Aguadilla Municipio, PR 121 km (75 mi) NNW of here earthquakes near Aguadilla Municipio
Isabela Municipio, PR 126 km (79 mi) NNW of here earthquakes near Isabela Municipio
Quebradillas Municipio, PR 133 km (82 mi) NNW of here earthquakes near Quebradillas Municipio
Camuy Municipio, PR 138 km (86 mi) NNW of here earthquakes near Camuy Municipio
Hatillo Municipio, PR 142 km (88 mi) NW of here earthquakes near Hatillo Municipio
Arecibo Municipio, PR 151 km (94 mi) NW of here earthquakes near Arecibo Municipio

Places and coordinates from the US Census Bureau Gazetteer (2024). Distances are from the epicentre.

Aftershocks so far

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

  1. 3.4 75 km NNW of San Antonio, Puerto Rico
  2. 3.6 74 km NNW of San Antonio, Puerto Rico
  3. 3.5 Mona Passage
  4. 3.6 80 km NNW of San Antonio, Puerto Rico
  5. 3.1 79 km NNW of San Antonio, Puerto Rico
  6. 3.8 104 km NNW of San Antonio, Puerto Rico
  7. 3.2 99 km NE of Punta Cana, Dominican Republic
  8. 3.6 87 km NE of Punta Cana, Dominican Republic
  9. 3.5 84 km NNW of San Antonio, Puerto Rico
  10. 3.4 91 km NNE of Punta Cana, Dominican Republic
  11. 3.5 84 km NNW of San Antonio, Puerto Rico
  12. 3.5 79 km N of San Antonio, Puerto Rico
  13. 3.5 98 km NE of Punta Cana, Dominican Republic
  14. 3.8 88 km NNW of San Antonio, Puerto Rico
  15. 3.5 129 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.

For this area

The largest earthquake within 50 km in our catalogue was M 4.7 on 2018-12-07 — it released about 29 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.