QuakeIndex

Earthquake · reviewed by a seismologist

M 2.8Md

Mona Passage

Yes. A magnitude 2.8 earthquake was recorded in Mona Passage, 13 km (8 mi) WSW of Mayagüez, PR, at 11:04 pm AST on 29 October 2016 (03:04 UTC), 29 km deep.

13 km (8 mi) WSW of Mayagüez, PR · 129 km (80 mi) WSW of San Juan, PR

· 29 km deep · released about 480 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Hormigueros Municipio 16 kmRincón Municipio 19 kmAñasco Municipio 19 kmCabo Rojo Municipio 21 kmAguada Municipio 24 kmSan Germán Municipio 25 kmMoca Municipio 30 kmLas Marías Municipio 31 kmLajas Municipio 32 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 2.8 (Md)
Depth
29 km below the surface
Felt
no reports yet
Nearest
Hormigueros Municipio, 16 km ESE
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 3579 days ago

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

At this magnitude and depth it was probably too small to be felt, even directly above it. 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.

Earthquakes near other towns within 30 km: Puerto Real, Mayagüez, Hormigueros, La Playa, Cabo Rojo, Stella.

How big was it?

This earthquake released about 480 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 3.8 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 32,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 22,000× the energy of this one
  3. Around the size people start to feel M 3.0 2× the energy of this one
  4. This earthquake M 2.8 about 480 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.

Where

Epicentre 18.1697, -67.2615. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection from the epicentre
Hormigueros Municipio, PR 16 km (10 mi) ESE earthquakes near Hormigueros Municipio
Rincón Municipio, PR 19 km (12 mi) N earthquakes near Rincón Municipio
Añasco Municipio, PR 19 km (12 mi) NE earthquakes near Añasco Municipio
Cabo Rojo Municipio, PR 21 km (13 mi) SSE earthquakes near Cabo Rojo Municipio
Aguada Municipio, PR 24 km (15 mi) NNE earthquakes near Aguada Municipio
San Germán Municipio, PR 25 km (15 mi) ESE earthquakes near San Germán Municipio

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

Aftershocks so far

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

  1. 1.9 12 km SSE of Lares, Puerto Rico
  2. 2.5 11 km NW of Puerto Real, Puerto Rico
  3. 2.9 32 km W of Rincón, Puerto Rico
  4. 1.9 3 km ESE of Las Marías, Puerto Rico
  5. 2.3 10 km NNW of Puerto Real, Puerto Rico
  6. 2.4 8 km WSW of Mayagüez, Puerto Rico
  7. 2.4 3 km WSW of La Parguera, Puerto Rico
  8. 1.7 14 km W of Puerto Real, Puerto Rico
  9. 2.3 9 km WSW of Puerto Real, Puerto Rico
  10. 2.2 3 km NW of Hormigueros, Puerto Rico
  11. 2.4 13 km SSW of Guánica, Puerto Rico
  12. 2.4 32 km W of Rincón, Puerto Rico
  13. 2.9 6 km SSW of La Playa, Puerto Rico
  14. 2.8 6 km SSW of La Playa, Puerto Rico
  15. 1.6 3 km W of Liborio Negron Torres, 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.