QuakeIndex

Earthquake · reviewed by a seismologist

M 2.6md

Mona Passage

Yes. A magnitude 2.6 earthquake was recorded in Mona Passage, 54 km (33 mi) NW of Arecibo, PR, at 6:03 pm AST on 31 January 2019 (22:03 UTC), 6.0 km deep.

54 km (33 mi) NW of Arecibo, PR · 119 km (74 mi) WNW of San Juan, PR

· 6.0 km deep · released about 240 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Aguadilla Municipio 31 kmIsabela Municipio 33 kmQuebradillas Municipio 39 kmMoca Municipio 42 kmAguada Municipio 42 kmCamuy Municipio 45 kmRincón Municipio 48 kmHatillo Municipio 50 kmSan Sebastián Municipio 50 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 2.6 (md)
Depth
6.0 km below the surface
Felt
no reports yet
Nearest
Aguadilla Municipio, 31 km S
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 2841 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 23 km (14 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 240 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 3.6 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 63,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 45,000× the energy of this one
  3. Around the size people start to feel M 3.0 4× the energy of this one
  4. This earthquake M 2.6 about 240 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 in our catalogue was M 4.3 on 2017-10-14 — about 350 times the energy of this one.

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 18.7545, -67.1348. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection from the epicentre
Aguadilla Municipio, PR 31 km (19 mi) S earthquakes near Aguadilla Municipio
Isabela Municipio, PR 33 km (20 mi) SSE earthquakes near Isabela Municipio
Quebradillas Municipio, PR 39 km (24 mi) SE earthquakes near Quebradillas Municipio
Moca Municipio, PR 42 km (26 mi) S earthquakes near Moca Municipio
Aguada Municipio, PR 42 km (26 mi) S earthquakes near Aguada Municipio
Camuy Municipio, PR 45 km (28 mi) SE earthquakes near Camuy Municipio

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

Aftershocks so far

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

  1. 2.6 44 km N of Carrizales, Puerto Rico
  2. 2.3 33 km N of San Antonio, Puerto Rico
  3. 2.6 63 km N of Hatillo, Puerto Rico
  4. 2.9 76 km NNW of San Antonio, Puerto Rico
  5. 2.1 6 km N of San Sebastián, Puerto Rico
  6. 2.5 29 km N of San Antonio, Puerto Rico
  7. 3.1 76 km NNW of San Antonio, Puerto Rico
  8. 2.9 51 km N of Isabela, Puerto Rico
  9. 2.2 37 km NNW of San Antonio, Puerto Rico
  10. 2.8 24 km N of Arecibo, Puerto Rico
  11. 2.0 5 km SW of San Antonio, Puerto Rico
  12. 2.5 Puerto Rico region
  13. 2.1 8 km WNW of San Antonio, Puerto Rico
  14. 2.5 48 km NW of San Antonio, Puerto Rico
  15. 2.7 30 km NW of Aguadilla, 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.