QuakeIndex

Earthquake · reviewed by a seismologist

M 4.0md

120 km NNW of San Antonio, Puerto Rico

· 49 km deep · released about 17 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 4.0 (md)
Depth
49 km below the surface
Felt
no reports yet
Nearest
Aguadilla Municipio, 120 km SSE
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 1517 days ago

This was a light earthquake. It is usually felt clearly nearby and can rattle windows and dishes, but damage is uncommon.

How big was it?

This earthquake released about 17 tons of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 5.0 would have released about 32 times as much.

  1. Northridge, California 1994 M 6.7 9,800× the energy of this one
  2. Mineral, Virginia 2011 M 5.8 440× the energy of this one
  3. Magna, Utah 2020 M 5.7 310× the energy of this one
  4. This earthquake M 4.0 about 17 tons of TNT
  5. Around the size people start to feel M 3.0 this one released 36× 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 19.4451, -67.6586. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Aguadilla Municipio, PR 120 km (75 mi) NNW of here earthquakes near Aguadilla Municipio
Isabela Municipio, PR 127 km (79 mi) NNW of here earthquakes near Isabela Municipio
Aguada Municipio, PR 129 km (80 mi) NNW of here earthquakes near Aguada Municipio
Quebradillas Municipio, PR 133 km (83 mi) NW of here earthquakes near Quebradillas Municipio
Moca Municipio, PR 133 km (83 mi) NNW of here earthquakes near Moca Municipio
Camuy Municipio, PR 139 km (86 mi) NW of here earthquakes near Camuy Municipio

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

Aftershocks so far

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

  1. 3.9 79 km NE of Punta Cana, Dominican Republic
  2. 4.4 98 km NE of Punta Cana, Dominican Republic
  3. 3.6 79 km NE of Punta Cana, Dominican Republic
  4. 3.7 Mona Passage
  5. 3.2 98 km N of San Antonio, Puerto Rico
  6. 3.7 113 km NNE of Punta Cana, Dominican Republic
  7. 3.4 109 km N of San Antonio, Puerto Rico
  8. 3.3 75 km NE of Punta Cana, Dominican Republic
  9. 3.4 110 km N of San Antonio, Puerto Rico
  10. 4.0 76 km NNE of Punta Cana, Dominican Republic
  11. 3.8 Mona Passage
  12. 3.8 138 km NNW of San Antonio, Puerto Rico
  13. 3.4 112 km N of San Antonio, Puerto Rico
  14. 3.6 91 km N of San Antonio, Puerto Rico
  15. 3.4 97 km NW 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 8.8 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.