QuakeIndex

Earthquake · reviewed by a seismologist

M 3.1Md

Mona Passage

Yes. A magnitude 3.1 earthquake was recorded in Mona Passage, 52 km (32 mi) NW of Mayagüez, PR, at 9:38 pm AST on 4 November 2016 (01:38 UTC), 13 km deep.

52 km (32 mi) NW of Mayagüez, PR · 144 km (90 mi) W of Bayamón, PR

· 13 km deep · released about 1,300 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Rincón Municipio 34 kmAguada Municipio 38 kmAguadilla Municipio 40 kmAñasco Municipio 47 kmMoca Municipio 49 kmIsabela Municipio 54 kmHormigueros Municipio 59 kmMayagüez Municipio 59 kmSan Sebastián Municipio 61 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 3.1 (Md)
Depth
13 km below the surface
Felt
no reports yet
Nearest
Rincón Municipio, 34 km ESE
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 3570 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, people at rest would likely notice it out to about 40 km (25 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.

Likely felt in: Rincón 34 km, intensity II · Aguada 38 km, intensity II · Aguadilla 40 km, intensity II. Estimated for each town centre; each link is that town's own record.

How big was it?

This earthquake released about 1,300 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 4.1 would have released about 32 times as much.

  1. Northridge, California 1994 M 6.7 250,000× the energy of this one
  2. Mineral, Virginia 2011 M 5.8 11,000× the energy of this one
  3. Magna, Utah 2020 M 5.7 7,900× the energy of this one
  4. This earthquake M 3.1 about 1,300 lb of TNT
  5. Around the size people start to feel M 3.0 this one released 1.4× 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 18.4930, -67.5241. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection from the epicentre
Rincón Municipio, PR 34 km (21 mi) ESE earthquakes near Rincón Municipio
Aguada Municipio, PR 38 km (24 mi) ESE earthquakes near Aguada Municipio
Aguadilla Municipio, PR 40 km (25 mi) E earthquakes near Aguadilla Municipio
Añasco Municipio, PR 47 km (29 mi) ESE earthquakes near Añasco Municipio
Moca Municipio, PR 49 km (30 mi) ESE earthquakes near Moca Municipio
Isabela Municipio, PR 54 km (33 mi) E earthquakes near Isabela Municipio

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

Aftershocks so far

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

  1. 2.4 4 km NW of Rincón, Puerto Rico
  2. 2.6 13 km NW of Rincón, Puerto Rico
  3. 3.1 51 km NNW of San Antonio, Puerto Rico
  4. 3.0 49 km NW of San Antonio, Puerto Rico
  5. 2.9 51 km NNW of San Antonio, Puerto Rico
  6. 2.1 11 km WNW of Puerto Real, Puerto Rico
  7. 2.9 2 km SSW of Stella, Puerto Rico
  8. 2.6 11 km NW of Puerto Real, Puerto Rico
  9. 2.1 14 km WNW of Puerto Real, Puerto Rico
  10. 2.4 12 km NW of Puerto Real, Puerto Rico
  11. 2.4 26 km W of Puerto Real, Puerto Rico
  12. 2.5 15 km SSW of Stella, Puerto Rico
  13. 2.8 32 km WNW of Rincón, Puerto Rico
  14. 3.0 46 km NW of San Antonio, Puerto Rico
  15. 2.8 48 km NW 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.

On USGS

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