QuakeIndex

Earthquake · reviewed by a seismologist

M 2.7md

Mona Passage

Yes. A magnitude 2.7 earthquake was recorded in Mona Passage, 9 km (6 mi) NNW of Mayagüez, PR, at 10:43 pm AST on 23 July 2023 (02:43 UTC), 106 km deep.

9 km (6 mi) NNW of Mayagüez, PR · 118 km (73 mi) W of San Juan, PR

· 106 km deep · released about 360 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Añasco Municipio 5 kmRincón Municipio 10 kmAguada Municipio 11 kmMoca Municipio 15 kmHormigueros Municipio 17 kmLas Marías Municipio 22 kmAguadilla Municipio 22 kmSan Sebastián Municipio 22 kmSan Germán 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 2.7 (md)
Depth
106 km below the surface
Felt
no reports yet
Nearest
Añasco Municipio, 5 km E
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 1207 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: La Playa, Las Marias, Añasco, Espino, Stella, Luyando.

How big was it?

This earthquake released about 360 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 3.7 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 42,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 30,000× the energy of this one
  3. Around the size people start to feel M 3.0 2.6× the energy of this one
  4. This earthquake M 2.7 about 360 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 5.3 on 2020-07-03 — about 7,400 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 18.2802, -67.1753. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection from the epicentre
Añasco Municipio, PR 5 km (3 mi) E earthquakes near Añasco Municipio
Rincón Municipio, PR 10 km (6 mi) NW earthquakes near Rincón Municipio
Aguada Municipio, PR 11 km (7 mi) N earthquakes near Aguada Municipio
Moca Municipio, PR 15 km (9 mi) NE earthquakes near Moca Municipio
Hormigueros Municipio, PR 17 km (11 mi) SSE earthquakes near Hormigueros Municipio
Las Marías Municipio, PR 22 km (13 mi) ESE earthquakes near Las Marías Municipio

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

Aftershocks so far

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

  1. 2.9 Puerto Rico region
  2. 2.7 5 km WSW of La Parguera, Puerto Rico
  3. 2.4 7 km WSW of La Parguera, Puerto Rico
  4. 3.2 6 km WSW of La Parguera, Puerto Rico
  5. 2.6 1 km E of Palomas, Puerto Rico
  6. 2.7 0 km SSW of Indios, Puerto Rico
  7. 2.6 2 km SSW of Las Marías, Puerto Rico
  8. 2.8 0 km E of Palomas, Puerto Rico
  9. 2.3 2 km SW of Indios, Puerto Rico
  10. 2.4 5 km E of La Parguera, Puerto Rico
  11. 2.8 8 km SE of La Parguera, Puerto Rico
  12. 2.6 3 km WSW of La Parguera, Puerto Rico
  13. 2.4 8 km SW of La Parguera, Puerto Rico
  14. 2.0 3 km S of Guánica, Puerto Rico
  15. 2.4 2 km SW of Indios, 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.