Earthquake · reviewed by a seismologist
M 2.8Md
Mona Passage
Yes. A magnitude 2.8 earthquake was recorded in Mona Passage, 99 km (61 mi) WNW of Ponce, PR, at 9:44 am AST on 21 November 2016 (13:44 UTC), 11 km deep.
99 km (61 mi) WNW of Ponce, PR · 40 km (25 mi) WNW of Mayagüez, PR
- When
- Magnitude
- M 2.8 (Md)
- Depth
- 11 km below the surface
- Felt
- no reports yet
- Nearest
- Rincón Municipio, 28 km ENE
- Status
- Reviewed by a seismologist
USGS · last changed by USGS · we first saw it 3556 days ago
Earthquake alerts for Stella, PR
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Alerts are on for .
Not a warning. An alert comes after USGS publishes a quake, usually minutes after the shaking. For early warning use ShakeAlert, through your phone's Wireless Emergency Alerts or the MyShake app.
This was a small earthquake. Shaking like this is often felt indoors nearby and very rarely causes damage.
At this magnitude and depth, people at rest would likely notice it out to about 25 km (16 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.
Earthquakes near other towns within 30 km: Stella, Rincón.
How big was it?
This earthquake released about 480 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 3.8 would have released about 32 times as much.
- Mineral, Virginia 2011 M 5.8 32,000× the energy of this one
- Magna, Utah 2020 M 5.7 22,000× the energy of this one
- Around the size people start to feel M 3.0 2× the energy of this one
- This earthquake M 2.8 about 480 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 18.2777, -67.5091. Map © OpenStreetMap contributors.
Nearby places
| Place | Distance | Direction from the epicentre | |
|---|---|---|---|
| Rincón Municipio, PR | 28 km (17 mi) | ENE | earthquakes near Rincón Municipio |
| Aguada Municipio, PR | 36 km (22 mi) | ENE | earthquakes near Aguada Municipio |
| Añasco Municipio, PR | 40 km (25 mi) | E | earthquakes near Añasco Municipio |
| Hormigueros Municipio, PR | 44 km (28 mi) | ESE | earthquakes near Hormigueros Municipio |
| Aguadilla Municipio, PR | 45 km (28 mi) | ENE | earthquakes near Aguadilla Municipio |
| Mayagüez Municipio, PR | 45 km (28 mi) | WSW | earthquakes near Mayagüez Municipio |
Places and coordinates from the US Census Bureau Gazetteer (2024). Distances are from the epicentre.
Aftershocks so far
36 earthquakes have been recorded within 50 km since this one.
- 3.1 20 km NW of San Antonio, Puerto Rico
- 1.8 4 km WNW of Mayagüez, Puerto Rico
- 2.1 5 km NNE of Sabana Eneas, Puerto Rico
- 2.4 4 km NW of Rincón, Puerto Rico
- 2.5 0 km S of Hormigueros, Puerto Rico
- 2.0 7 km WNW of Puerto Real, Puerto Rico
- 2.6 13 km NW of Rincón, Puerto Rico
- 2.1 11 km WNW of Puerto Real, Puerto Rico
- 2.9 2 km SSW of Stella, Puerto Rico
- 2.6 11 km NW of Puerto Real, Puerto Rico
- 2.1 14 km WNW of Puerto Real, Puerto Rico
- 2.4 12 km NW of Puerto Real, Puerto Rico
- 2.4 26 km W of Puerto Real, Puerto Rico
- 1.7 1 km NNE of Puerto Real, Puerto Rico
- 2.5 15 km SSW of Stella, 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
- The official USGS event page — the source of record for every value above
- Did you feel it? Report it to USGS — reports go to USGS, not to us
- ShakeMap for this event, when USGS has produced one
QuakeIndex does not issue warnings. For earthquake early warning see ShakeAlert.