QuakeIndex

Earthquake · reviewed by a seismologist

M 4.2md

15 km N of Isabela, Puerto Rico

· 108 km deep · released about 28 tons of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Isabela Municipio 18 kmAguadilla Municipio 21 kmQuebradillas Municipio 23 kmCamuy Municipio 29 kmMoca Municipio 30 kmAguada Municipio 33 kmHatillo Municipio 34 kmSan Sebastián Municipio 36 kmRincón Municipio 40 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 4.2 (md)
Depth
108 km below the surface
Felt
9 reports · strongest reported intensity III
Measured shaking
intensity III (ShakeMap)
USGS impact alert
green
Nearest
Isabela Municipio, 18 km S
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 1300 days ago

This was a light earthquake. It is usually felt clearly nearby and can rattle windows and dishes, but damage is uncommon. 9 people have reported feeling it to USGS.

How big was it?

This earthquake released about 28 tons of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 5.2 would have released about 32 times as much.

  1. Northridge, California 1994 M 6.7 6,000× the energy of this one
  2. Mineral, Virginia 2011 M 5.8 270× the energy of this one
  3. Magna, Utah 2020 M 5.7 190× the energy of this one
  4. This earthquake M 4.2 about 28 tons of TNT
  5. Around the size people start to feel M 3.0 this one released 59× 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 18.6438, -67.0435. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Isabela Municipio, PR 18 km (11 mi) N of here earthquakes near Isabela Municipio
Aguadilla Municipio, PR 21 km (13 mi) NNE of here earthquakes near Aguadilla Municipio
Quebradillas Municipio, PR 23 km (14 mi) NNW of here earthquakes near Quebradillas Municipio
Camuy Municipio, PR 29 km (18 mi) NW of here earthquakes near Camuy Municipio
Moca Municipio, PR 30 km (19 mi) N of here earthquakes near Moca Municipio
Aguada Municipio, PR 33 km (21 mi) NNE of here earthquakes near Aguada Municipio

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

Aftershocks so far

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

  1. 2.6 11 km N of Carrizales, Puerto Rico
  2. 2.5 3 km ESE of Las Marías, Puerto Rico
  3. 3.0 25 km NNE of Isabela, Puerto Rico
  4. 2.4 Mona Passage
  5. 3.4 Mona Passage
  6. 2.5 Mona Passage
  7. 3.4 44 km NW of San Antonio, Puerto Rico
  8. 3.3 59 km N of San Antonio, Puerto Rico
  9. 2.8 10 km NNE of Carrizales, Puerto Rico
  10. 3.3 52 km N of San Antonio, Puerto Rico
  11. 3.5 12 km NNE of Arecibo, Puerto Rico
  12. 3.0 1 km SSE of La Playa, Puerto Rico
  13. 3.2 41 km NW of San Antonio, Puerto Rico
  14. 3.0 27 km N of Hatillo, Puerto Rico
  15. 3.4 48 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 5.1 on 2019-09-24 — it released about 21 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.