QuakeIndex

Earthquake · reviewed by a seismologist

M 4.0md

115 km N of Isabela, Puerto Rico

· 28 km deep · released about 15 tons of TNT

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10 km30 km60 km120 km N Aguadilla Municipio 118 kmIsabela Municipio 118 km
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
28 km below the surface
Felt
no reports yet
Nearest
Aguadilla Municipio, 118 km S
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 2412 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 15 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 11,000× the energy of this one
  2. Mineral, Virginia 2011 M 5.8 500× the energy of this one
  3. Magna, Utah 2020 M 5.7 350× the energy of this one
  4. This earthquake M 4.0 about 15 tons of TNT
  5. Around the size people start to feel M 3.0 this one released 32× 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 19.5398, -67.1668. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Aguadilla Municipio, PR 118 km (73 mi) N of here earthquakes near Aguadilla Municipio
Isabela Municipio, PR 118 km (74 mi) N of here earthquakes near Isabela Municipio
Quebradillas Municipio, PR 122 km (76 mi) NNW of here earthquakes near Quebradillas Municipio
Barceloneta Municipio, PR 135 km (84 mi) NNW of here earthquakes near Barceloneta Municipio
Dorado Municipio, PR 152 km (94 mi) NW of here earthquakes near Dorado Municipio

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

Aftershocks so far

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

  1. 2.7 88 km NNW of San Antonio, Puerto Rico
  2. 3.0 94 km NNW of San Antonio, Puerto Rico
  3. 2.8 89 km NNW of San Antonio, Puerto Rico
  4. 3.3 94 km NNW of San Antonio, Puerto Rico
  5. 2.8 90 km NNW of San Antonio, Puerto Rico
  6. 2.9 68 km N of San Antonio, Puerto Rico
  7. 2.7 95 km NNW of San Antonio, Puerto Rico
  8. 3.0 93 km NNW of San Antonio, Puerto Rico
  9. 3.4 91 km NNW of San Antonio, Puerto Rico
  10. 2.8 83 km NNW of San Antonio, Puerto Rico
  11. 2.9 72 km N of Isabela, Puerto Rico
  12. 3.1 86 km NNW of San Antonio, Puerto Rico
  13. 2.7 95 km N of Isabela, Puerto Rico
  14. 2.9 80 km NNW of San Antonio, Puerto Rico
  15. 3.0 79 km N of Isabela, 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 2019-09-27 — it released about 11 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.