QuakeIndex

Earthquake · reviewed by a seismologist

M 2.9md

Mona Passage

Yes. A magnitude 2.9 earthquake was recorded in Mona Passage, 8 km (5 mi) E of Mayagüez, PR, at 5:55 am AST on 8 October 2022 (09:55 UTC), 22 km deep. 1 person has reported feeling it to USGS.

8 km (5 mi) E of Mayagüez, PR · 108 km (67 mi) WSW of San Juan, PR

· 22 km deep · released about 630 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Hormigueros Municipio 9 kmLas Marías Municipio 10 kmSan Germán Municipio 11 kmAñasco Municipio 12 kmMaricao Municipio 14 kmSabana Grande Municipio 18 kmSan Sebastián Municipio 18 kmMoca Municipio 20 kmLares Municipio 23 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 2.9 (md)
Depth
22 km below the surface
Felt
1 report · strongest reported intensity II
Nearest
Hormigueros Municipio, 9 km SW
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 1495 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 22 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.

Likely felt in: Mayagüez 8 km, intensity II · San Germán 13 km, intensity II · San Sebastián 17 km, intensity II · Puerto Real 19 km, intensity II. Estimated for each town centre; each link is that town's own record.

How big was it?

This earthquake released about 630 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 3.9 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 24,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 17,000× the energy of this one
  3. Around the size people start to feel M 3.0 1.5× the energy of this one
  4. This earthquake M 2.9 about 630 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 190,000 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 18.1987, -67.0678. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection from the epicentre
Hormigueros Municipio, PR 9 km (5 mi) SW earthquakes near Hormigueros Municipio
Las Marías Municipio, PR 10 km (6 mi) ENE earthquakes near Las Marías Municipio
San Germán Municipio, PR 11 km (7 mi) SSE earthquakes near San Germán Municipio
Añasco Municipio, PR 12 km (7 mi) NW earthquakes near Añasco Municipio
Maricao Municipio, PR 14 km (9 mi) E earthquakes near Maricao Municipio
Sabana Grande Municipio, PR 18 km (11 mi) SE earthquakes near Sabana Grande Municipio

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

Aftershocks so far

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

  1. 2.1 Puerto Rico region
  2. 2.1 4 km SE of La Parguera, Puerto Rico
  3. 2.5 4 km SW of Gu?nica, Puerto Rico
  4. 1.6 0 km S of Guánica, Puerto Rico
  5. 2.0 10 km SSE of Indios, Puerto Rico
  6. 2.5 4 km SSE of Maria Antonia, Puerto Rico
  7. 2.6 2 km SW of Santo Domingo, Puerto Rico
  8. 2.7 7 km SSE of Maria Antonia, Puerto Rico
  9. 2.5 5 km ESE of La Parguera, Puerto Rico
  10. 2.3 Puerto Rico region
  11. 1.8 Puerto Rico region
  12. 1.6 5 km E of La Parguera, Puerto Rico
  13. 2.6 14 km SW of La Playa, Puerto Rico
  14. 2.6 13 km S of Guánica, Puerto Rico
  15. 1.7 7 km ESE of La Parguera, 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.