QuakeIndex

Earthquake · reviewed by a seismologist

M 3.7md

Mona Passage

Yes. A magnitude 3.7 earthquake was recorded in Mona Passage, at 11:07 am AST on 22 June 2023 (15:07 UTC), 79 km deep.

· 79 km deep · released about 5.9 tons of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Rincón Municipio 57 kmAguada Municipio 61 kmMayagüez Municipio 62 kmAguadilla Municipio 62 kmAñasco Municipio 71 kmMoca Municipio 72 kmIsabela Municipio 75 kmHormigueros Municipio 82 kmQuebradillas Municipio 84 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 3.7 (md)
Depth
79 km below the surface
Felt
no reports yet
Nearest
Rincón Municipio, 57 km ESE
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 1173 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.

How big was it?

This earthquake released about 5.9 tons of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 4.7 would have released about 32 times as much.

  1. Northridge, California 1994 M 6.7 29,000× the energy of this one
  2. Mineral, Virginia 2011 M 5.8 1,300× the energy of this one
  3. Magna, Utah 2020 M 5.7 900× the energy of this one
  4. This earthquake M 3.7 about 5.9 tons of TNT
  5. Around the size people start to feel M 3.0 this one released 12× more

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 4.6 on 2020-01-29 — about 20 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 18.6128, -67.7116. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection from the epicentre
Rincón Municipio, PR 57 km (36 mi) ESE earthquakes near Rincón Municipio
Aguada Municipio, PR 61 km (38 mi) ESE earthquakes near Aguada Municipio
Mayagüez Municipio, PR 62 km (38 mi) SSW earthquakes near Mayagüez Municipio
Aguadilla Municipio, PR 62 km (38 mi) ESE earthquakes near Aguadilla Municipio
Añasco Municipio, PR 71 km (44 mi) ESE earthquakes near Añasco Municipio
Moca Municipio, PR 72 km (44 mi) ESE earthquakes near Moca Municipio

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

Aftershocks so far

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

  1. 3.1 45 km NW of San Antonio, Puerto Rico
  2. 3.0 44 km NW of San Antonio, Puerto Rico
  3. 3.1 60 km NW of San Antonio, Puerto Rico
  4. 3.2 40 km NW of Aguadilla, Puerto Rico
  5. 2.6 16 km W of Rincón, Puerto Rico
  6. 3.6 20 km WNW of Rincón, Puerto Rico
  7. 3.2 66 km NW of San Antonio, Puerto Rico
  8. 3.8 53 km SE of Punta Cana, Dominican Republic
  9. 3.2 Mona Passage
  10. 2.9 26 km NW of Rincón, Puerto Rico
  11. 2.8 25 km WSW of Stella, Puerto Rico
  12. 3.2 44 km NW of San Antonio, Puerto Rico
  13. 3.0 44 km NW of San Antonio, Puerto Rico
  14. 3.2 40 km NW of San Antonio, Puerto Rico
  15. 3.0 46 km NNW of San Antonio, 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.