QuakeIndex

Earthquake · reviewed by a seismologist

M 3.9md

98 km SW of Pole Ojea, Puerto Rico

· 46 km deep · released about 10 tons of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Mayagüez Municipio 70 kmCabo Rojo Municipio 100 kmLajas Municipio 111 kmHormigueros Municipio 115 kmSan Germán Municipio 120 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 3.9 (md)
Depth
46 km below the surface
Felt
no reports yet
Nearest
Mayagüez Municipio, 70 km N
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 890 days ago

This was a small earthquake. Shaking like this is often felt indoors nearby and very rarely causes damage.

How big was it?

This earthquake released about 10 tons of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 4.9 would have released about 32 times as much.

  1. Northridge, California 1994 M 6.7 16,000× the energy of this one
  2. Mineral, Virginia 2011 M 5.8 730× the energy of this one
  3. Magna, Utah 2020 M 5.7 520× the energy of this one
  4. This earthquake M 3.9 about 10 tons of TNT
  5. Around the size people start to feel M 3.0 this one released 22× 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 17.4541, -67.9360. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Mayagüez Municipio, PR 70 km (44 mi) S of here earthquakes near Mayagüez Municipio
Cabo Rojo Municipio, PR 100 km (62 mi) SW of here earthquakes near Cabo Rojo Municipio
Lajas Municipio, PR 111 km (69 mi) WSW of here earthquakes near Lajas Municipio
Hormigueros Municipio, PR 115 km (72 mi) SW of here earthquakes near Hormigueros Municipio
San Germán Municipio, PR 120 km (74 mi) SW of here earthquakes near San Germán Municipio
Guánica Municipio, PR 121 km (75 mi) WSW of here earthquakes near Guánica Municipio

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

Aftershocks so far

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

  1. 3.3 64 km SW of Pole Ojea, Puerto Rico
  2. 3.7 110 km SW of Pole Ojea, Puerto Rico
  3. 3.4 105 km SW of Pole Ojea, Puerto Rico
  4. 3.4 86 km SW of Pole Ojea, Puerto Rico
  5. 3.3 79 km SE of Boca de Yuma, Dominican Republic
  6. 3.3 83 km SE of Boca de Yuma, Dominican Republic
  7. 4.7 106 km WSW of Pole Ojea, Puerto Rico
  8. 3.4 89 km SSE of Boca de Yuma, Dominican Republic
  9. 3.0 65 km SW of Pole Ojea, Puerto Rico
  10. 3.9 123 km SSE of Boca de Yuma, Dominican Republic
  11. 3.0 54 km SW of Pole Ojea, Puerto Rico
  12. 3.4 83 km W of Pole Ojea, Puerto Rico
  13. 2.9 61 km SW of Pole Ojea, Puerto Rico
  14. 3.5 94 km SW of Pole Ojea, Puerto Rico
  15. 3.6 96 km SW of Pole Ojea, 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.