QuakeIndex

Earthquake · reviewed by a seismologist

M 2.4Md

88 km NNE of Luquillo, Puerto Rico

Yes. A magnitude 2.4 earthquake was recorded 88 km NNE of Luquillo, Puerto Rico, at 7:55 pm AST on 25 September 2016 (23:55 UTC), 20 km deep.

· 20 km deep · released about 120 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Fajardo Municipio 82 kmCulebra Municipio 86 kmLuquillo Municipio 89 kmRío Grande Municipio 92 kmLoíza Municipio 94 kmCeiba Municipio 98 kmCarolina Municipio 100 kmCanóvanas Municipio 101 kmSan Juan Municipio 105 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 2.4 (Md)
Depth
20 km below the surface
Felt
no reports yet
Nearest
Fajardo Municipio, 82 km SSW
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 3699 days ago

This was a minor earthquake. Quakes this small are rarely felt and do not cause damage.

At this magnitude and depth, people at rest would likely notice it out to about 7 km (4 mi) from the epicentre. Estimated from magnitude, depth and distance with the intensity equation USGS Did You Feel It? uses; felt reports, where there are any, are the measurement.

How big was it?

This earthquake released about 120 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 3.4 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 130,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 89,000× the energy of this one
  3. Around the size people start to feel M 3.0 7.9× the energy of this one
  4. This earthquake M 2.4 about 120 lb of TNT

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.

For this area

The largest earthquake within 50 km since 2016 was M 4.3 on 2016-09-04 — about 710 times the energy of this one.

Before 2016, the USGS record lists 4 earthquakes of M5 or more within 50 km:

  1. 5.1 122 km NNE of Vieques, Puerto Rico · 35 km N of this epicentre
  2. 5.1 92 km N of Suárez, Puerto Rico · 41 km WNW of this epicentre
  3. 5.0 109 km N of Charlotte Amalie, U.S. Virgin Islands · 45 km NE of this epicentre
  4. 5.0 73 km NNE of Vieques, Puerto Rico · 17 km SW of this epicentre

Since 2016: the QuakeIndex catalogue (US, M1.5+), built from the USGS FDSN event service. Before 2016: USGS ComCat, M5+ from 1900. Distances are between epicentres. This is the record, not a forecast.

Where

Epicentre 19.0993, -65.3755. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection from the epicentre
Fajardo Municipio, PR 82 km (51 mi) SSW earthquakes near Fajardo Municipio
Culebra Municipio, PR 86 km (54 mi) S earthquakes near Culebra Municipio
Luquillo Municipio, PR 89 km (55 mi) SSW earthquakes near Luquillo Municipio
Río Grande Municipio, PR 92 km (57 mi) SSW earthquakes near Río Grande Municipio
Loíza Municipio, PR 94 km (58 mi) SW earthquakes near Loíza Municipio
Ceiba Municipio, PR 98 km (61 mi) SSW earthquakes near Ceiba Municipio

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

Aftershocks so far

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

  1. 2.8 72 km N of Charlotte Amalie, U.S. Virgin Islands
  2. 2.7 67 km N of Charlotte Amalie, U.S. Virgin Islands
  3. 2.8 109 km NNE of Vieques, Puerto Rico
  4. 3.2 72 km N of Culebra, Puerto Rico
  5. 2.2 59 km N of Culebra, Puerto Rico
  6. 2.8 75 km N of Culebra, Puerto Rico
  7. 1.9 57 km N of Culebra, Puerto Rico
  8. 2.4 Puerto Rico region
  9. 2.5 114 km N of Culebra, Puerto Rico
  10. 2.7 134 km NNE of Vieques, Puerto Rico
  11. 2.5 Virgin Islands
  12. 2.7 67 km N of Charlotte Amalie, U.S. Virgin Islands
  13. 2.5 124 km N of Charlotte Amalie, U.S. Virgin Islands
  14. 2.7 116 km NNW of Charlotte Amalie, U.S. Virgin Islands
  15. 2.6 92 km N of Charlotte Amalie, U.S. Virgin Islands

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.