QuakeIndex

Earthquake · reviewed by a seismologist

M 3.0md

Mona Passage

Yes. A magnitude 3.0 earthquake was recorded in Mona Passage, 15 km (9 mi) SW of Mayagüez, PR, at 2:11 pm AST on 29 October 2023 (18:11 UTC), 100 km deep.

15 km (9 mi) SW of Mayagüez, PR · 128 km (80 mi) WSW of San Juan, PR

· 100 km deep · released about 1,100 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Cabo Rojo Municipio 13 kmHormigueros Municipio 13 kmSan Germán Municipio 21 kmAñasco Municipio 23 kmLajas Municipio 25 kmRincón Municipio 26 kmSabana Grande Municipio 30 kmLas Marías Municipio 30 kmAguada Municipio 31 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 3.0 (md)
Depth
100 km below the surface
Felt
no reports yet
Nearest
Cabo Rojo Municipio, 13 km SSE
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 1109 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, Cabo Rojo, Boquerón, Hormigueros, Monte Grande, Mayagüez.

How big was it?

This earthquake released about 1,100 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 4.0 would have released about 32 times as much.

  1. Northridge, California 1994 M 6.7 300,000× the energy of this one
  2. Mineral, Virginia 2011 M 5.8 13,000× the energy of this one
  3. Magna, Utah 2020 M 5.7 9,400× the energy of this one
  4. This earthquake M 3.0 about 1,100 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 6.4 on 2020-01-07 — about 110,000 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 18.1015, -67.2327. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection from the epicentre
Cabo Rojo Municipio, PR 13 km (8 mi) SSE earthquakes near Cabo Rojo Municipio
Hormigueros Municipio, PR 13 km (8 mi) ENE earthquakes near Hormigueros Municipio
San Germán Municipio, PR 21 km (13 mi) E earthquakes near San Germán Municipio
Añasco Municipio, PR 23 km (14 mi) NNE earthquakes near Añasco Municipio
Lajas Municipio, PR 25 km (15 mi) SE earthquakes near Lajas Municipio
Rincón Municipio, PR 26 km (16 mi) N earthquakes near Rincón Municipio

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

Aftershocks so far

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

  1. 2.5 3 km S of Maria Antonia, Puerto Rico
  2. 2.1 5 km SSE of Guánica, Puerto Rico
  3. 2.5 6 km SW of Guánica, Puerto Rico
  4. 2.1 Puerto Rico region
  5. 2.5 4 km S of Indios, Puerto Rico
  6. 3.3 1 km NNE of Indios, Puerto Rico
  7. 2.2 1 km WNW of Guayanilla, Puerto Rico
  8. 2.4 1 km WSW of Guayanilla, Puerto Rico
  9. 3.0 4 km WSW of La Parguera, Puerto Rico
  10. 2.5 18 km WNW of Puerto Real, Puerto Rico
  11. 2.3 1 km ENE of Indios, Puerto Rico
  12. 3.1 4 km WSW of Mayagüez, Puerto Rico
  13. 3.4 6 km ENE of La Parguera, Puerto Rico
  14. 2.2 Puerto Rico region
  15. 2.0 Puerto Rico region

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.