QuakeIndex

Earthquake · reviewed by a seismologist

M 1.5md

Mona Passage

Yes. A magnitude 1.5 earthquake was recorded in Mona Passage, 12 km (7 mi) E of Mayagüez, PR, at 6:05 am AST on 28 August 2019 (10:05 UTC), 26 km deep.

12 km (7 mi) E of Mayagüez, PR · 105 km (65 mi) WSW of San Juan, PR

· 26 km deep · released about 5.7 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Las Marías Municipio 6 kmMaricao Municipio 11 kmSan Germán Municipio 11 kmHormigueros Municipio 12 kmAñasco Municipio 14 kmSan Sebastián Municipio 15 kmSabana Grande Municipio 16 kmLares Municipio 19 kmMoca Municipio 20 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 1.5 (md)
Depth
26 km below the surface
Felt
no reports yet
Nearest
Las Marías Municipio, 6 km ENE
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 2632 days ago

This was a minor earthquake. Quakes this small are rarely felt and do not cause 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: Maricao, Mayagüez, Espino, Hormigueros, San Germán, Añasco.

How big was it?

This earthquake released about 5.7 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 2.5 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 2,600,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 1,900,000× the energy of this one
  3. Around the size people start to feel M 3.0 170× the energy of this one
  4. This earthquake M 1.5 about 5.7 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 4.3 on 2017-10-14 — about 15,000 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 18.2056, -67.0318. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection from the epicentre
Las Marías Municipio, PR 6 km (4 mi) ENE earthquakes near Las Marías Municipio
Maricao Municipio, PR 11 km (7 mi) ESE earthquakes near Maricao Municipio
San Germán Municipio, PR 11 km (7 mi) S earthquakes near San Germán Municipio
Hormigueros Municipio, PR 12 km (7 mi) SW earthquakes near Hormigueros Municipio
Añasco Municipio, PR 14 km (9 mi) NW earthquakes near Añasco Municipio
San Sebastián Municipio, PR 15 km (10 mi) NNE earthquakes near San Sebastián Municipio

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

Aftershocks so far

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

  1. 1.6 9 km ESE of Maricao, Puerto Rico
  2. 2.3 10 km WNW of San Antonio, Puerto Rico
  3. 1.5 8 km WNW of Adjuntas, Puerto Rico
  4. 1.6 8 km W of Adjuntas, Puerto Rico
  5. 1.8 3 km SW of Hormigueros, Puerto Rico
  6. 2.3 14 km SW of Stella, Puerto Rico
  7. 2.1 5 km SSE of La Parguera, Puerto Rico
  8. 2.4 24 km WNW of Puerto Real, Puerto Rico
  9. 2.6 1 km NNW of Moca, Puerto Rico
  10. 1.6 5 km W of Pole Ojea, Puerto Rico
  11. 1.9 0 km WNW of Lajas, Puerto Rico
  12. 2.2 17 km WNW of Puerto Real, Puerto Rico
  13. 1.9 1 km NNE of Lluveras, Puerto Rico
  14. 2.2 18 km NW of Puerto Real, Puerto Rico
  15. 2.1 11 km WSW of Pole Ojea, 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.