QuakeIndex

Earthquake · reviewed by a seismologist

M 2.5md

Mona Passage

Yes. A magnitude 2.5 earthquake was recorded in Mona Passage, 21 km (13 mi) SSE of Mayagüez, PR, at 12:16 am AST on 21 October 2022 (04:16 UTC), 16 km deep.

21 km (13 mi) SSE of Mayagüez, PR · 114 km (71 mi) WSW of San Juan, PR

· 16 km deep · released about 150 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Lajas Municipio 7 kmSan Germán Municipio 9 kmCabo Rojo Municipio 12 kmHormigueros Municipio 13 kmSabana Grande Municipio 14 kmGuánica Municipio 18 kmMaricao Municipio 22 kmYauco Municipio 23 kmLas Marías Municipio 24 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 2.5 (md)
Depth
16 km below the surface
Felt
no reports yet
Nearest
Lajas Municipio, 7 km SSE
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 1483 days ago

This was a minor earthquake. Quakes this small are rarely felt and do not cause damage.

At this magnitude and depth, people at rest would likely notice it out to about 15 km (9 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: San Germán 6 km, intensity II · Puerto Real 13 km, intensity II · Pole Ojea 14 km, intensity II. Estimated for each town centre; each link is that town's own record.

How big was it?

This earthquake released about 150 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 3.5 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 99,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 70,000× the energy of this one
  3. Around the size people start to feel M 3.0 6.2× the energy of this one
  4. This earthquake M 2.5 about 150 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 790,000 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 18.0295, -67.0708. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection from the epicentre
Lajas Municipio, PR 7 km (4 mi) SSE earthquakes near Lajas Municipio
San Germán Municipio, PR 9 km (6 mi) NNE earthquakes near San Germán Municipio
Cabo Rojo Municipio, PR 12 km (8 mi) WSW earthquakes near Cabo Rojo Municipio
Hormigueros Municipio, PR 13 km (8 mi) NNW earthquakes near Hormigueros Municipio
Sabana Grande Municipio, PR 14 km (9 mi) ENE earthquakes near Sabana Grande Municipio
Guánica Municipio, PR 18 km (11 mi) ESE earthquakes near Guánica Municipio

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

Aftershocks so far

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

  1. 2.4 3 km ENE of Yauco, Puerto Rico
  2. 2.0 Puerto Rico region
  3. 2.1 2 km WSW of Indios, Puerto Rico
  4. 2.6 5 km W of Maricao, Puerto Rico
  5. 2.0 6 km E of La Parguera, Puerto Rico
  6. 1.8 4 km WSW of Guánica, Puerto Rico
  7. 2.3 4 km WSW of Guánica, Puerto Rico
  8. 1.7 6 km ESE of La Parguera, Puerto Rico
  9. 2.4 7 km WNW of Coto Laurel, Puerto Rico
  10. 2.1 0 km S of Indios, Puerto Rico
  11. 1.9 5 km ESE of Pole Ojea, Puerto Rico
  12. 2.3 4 km WSW of La Parguera, Puerto Rico
  13. 2.7 2 km SSE of Guayanilla, Puerto Rico
  14. 2.7 4 km NW of Hormigueros, Puerto Rico
  15. 2.6 6 km SSE of Maria Antonia, 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.