QuakeIndex

Earthquake · reviewed by a seismologist

M 1.9md

Mona Passage

Yes. A magnitude 1.9 earthquake was recorded in Mona Passage, 20 km (13 mi) SSE of Mayagüez, PR, at 3:17 am AST on 1 July 2019 (07:17 UTC), 6.0 km deep.

20 km (13 mi) SSE of Mayagüez, PR · 116 km (72 mi) WSW of San Juan, PR

· 6.0 km deep · released about 25 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Lajas Municipio 7 kmSan Germán Municipio 10 kmCabo Rojo Municipio 11 kmHormigueros Municipio 12 kmSabana Grande Municipio 16 kmGuánica Municipio 19 kmMaricao Municipio 23 kmYauco Municipio 25 kmLas Marías Municipio 25 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 1.9 (md)
Depth
6.0 km below the surface
Felt
no reports yet
Nearest
Lajas Municipio, 7 km SE
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 2690 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 14 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 7 km, intensity II · Puerto Real 12 km, intensity II · Pole Ojea 12 km, intensity II. Estimated for each town centre; each link is that town's own record.

How big was it?

This earthquake released about 25 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 3.0 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 600,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 420,000× the energy of this one
  3. Around the size people start to feel M 3.0 38× the energy of this one
  4. This earthquake M 1.9 about 25 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.

Where

Epicentre 18.0278, -67.0840. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection from the epicentre
Lajas Municipio, PR 7 km (4 mi) SE earthquakes near Lajas Municipio
San Germán Municipio, PR 10 km (6 mi) NNE earthquakes near San Germán Municipio
Cabo Rojo Municipio, PR 11 km (7 mi) WSW earthquakes near Cabo Rojo Municipio
Hormigueros Municipio, PR 12 km (8 mi) NNW earthquakes near Hormigueros Municipio
Sabana Grande Municipio, PR 16 km (10 mi) ENE earthquakes near Sabana Grande Municipio
Guánica Municipio, PR 19 km (12 mi) ESE earthquakes near Guánica Municipio

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

Aftershocks so far

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

  1. 1.8 8 km SW of La Playa, Puerto Rico
  2. 2.2 24 km WSW of Pole Ojea, Puerto Rico
  3. 1.5 3 km SE of Boquerón, Puerto Rico
  4. 2.0 3 km W of Palmarejo, Puerto Rico
  5. 1.8 1 km SE of Lajas, Puerto Rico
  6. 2.1 9 km SSE of La Parguera, Puerto Rico
  7. 1.9 10 km S of Pole Ojea, Puerto Rico
  8. 2.1 19 km WNW of Puerto Real, Puerto Rico
  9. 2.1 8 km W of Mayagüez, Puerto Rico
  10. 1.5 7 km WSW of Las Marías, Puerto Rico
  11. 2.5 17 km SSW of Stella, Puerto Rico
  12. 1.6 5 km E of Pole Ojea, Puerto Rico
  13. 2.0 0 km WNW of Maricao, Puerto Rico
  14. 2.3 1 km NNW of Palomas, Puerto Rico
  15. 2.1 5 km W of Fuig, 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

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