QuakeIndex

Earthquake · reviewed by a seismologist

M 2.4md

Mona Passage

Yes. A magnitude 2.4 earthquake was recorded in Mona Passage, 53 km (33 mi) NW of Mayagüez, PR, at 9:36 pm AST on 9 March 2018 (01:36 UTC), 16 km deep.

53 km (33 mi) NW of Mayagüez, PR · 144 km (90 mi) W of Bayamón, PR

· 16 km deep · released about 120 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Rincón Municipio 35 kmAguada Municipio 39 kmAguadilla Municipio 40 kmAñasco Municipio 48 kmMoca Municipio 49 kmIsabela Municipio 54 kmHormigueros Municipio 60 kmMayagüez Municipio 61 kmSan Sebastián Municipio 62 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 2.4 (md)
Depth
16 km below the surface
Felt
no reports yet
Nearest
Rincón Municipio, 35 km ESE
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 3168 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 13 km (8 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.

How big was it?

This earthquake released about 120 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 3.4 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 130,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 92,000× the energy of this one
  3. Around the size people start to feel M 3.0 8.2× the energy of this one
  4. This earthquake M 2.4 about 120 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 4.4 on 2017-10-01 — about 1,000 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 18.5083, -67.5250. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection from the epicentre
Rincón Municipio, PR 35 km (21 mi) ESE earthquakes near Rincón Municipio
Aguada Municipio, PR 39 km (24 mi) ESE earthquakes near Aguada Municipio
Aguadilla Municipio, PR 40 km (25 mi) E earthquakes near Aguadilla Municipio
Añasco Municipio, PR 48 km (30 mi) ESE earthquakes near Añasco Municipio
Moca Municipio, PR 49 km (31 mi) ESE earthquakes near Moca Municipio
Isabela Municipio, PR 54 km (34 mi) E earthquakes near Isabela Municipio

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

Aftershocks so far

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

  1. 2.9 37 km NNW of San Antonio, Puerto Rico
  2. 2.5 36 km NW of Aguadilla, Puerto Rico
  3. 2.4 1 km NNW of La Playa, Puerto Rico
  4. 2.2 29 km SW of Stella, Puerto Rico
  5. 2.7 42 km NNW of San Antonio, Puerto Rico
  6. 2.5 22 km WNW of Rincón, Puerto Rico
  7. 1.5 17 km WNW of Puerto Real, Puerto Rico
  8. 2.8 25 km NW of Rincón, Puerto Rico
  9. 2.5 38 km NW of Rincón, Puerto Rico
  10. 2.6 42 km W of Rincón, Puerto Rico
  11. 2.6 45 km NW of San Antonio, Puerto Rico
  12. 2.9 34 km WNW of Rincón, Puerto Rico
  13. 2.8 62 km E of Punta Cana, Dominican Republic
  14. 2.1 21 km SW of Stella, Puerto Rico
  15. 2.7 67 km NW of Rincón, 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.