Earthquake · reviewed by a seismologist
M 2.1md
Mona Passage
Yes. A magnitude 2.1 earthquake was recorded in Mona Passage, 14 km (9 mi) ESE of Mayagüez, PR, at 6:41 pm AST on 30 August 2018 (22:41 UTC), 23 km deep.
14 km (9 mi) ESE of Mayagüez, PR · 104 km (65 mi) WSW of San Juan, PR
- When
- Magnitude
- M 2.1 (md)
- Depth
- 23 km below the surface
- Felt
- no reports yet
- Nearest
- San Germán Municipio, 6 km SSW
- Status
- Reviewed by a seismologist
USGS · last changed by USGS · we first saw it 2995 days ago
Earthquake alerts for Maricao, 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 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, San Germán, Sabana Eneas, Sabana Grande, Hormigueros, Monte Grande.
How big was it?
This earthquake released about 47 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 3.1 would have released about 32 times as much.
- Mineral, Virginia 2011 M 5.8 320,000× the energy of this one
- Magna, Utah 2020 M 5.7 230,000× the energy of this one
- Around the size people start to feel M 3.0 20× the energy of this one
- This earthquake M 2.1 about 47 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 18.1591, -67.0180. Map © OpenStreetMap contributors.
Nearby places
| Place | Distance | Direction from the epicentre | |
|---|---|---|---|
| San Germán Municipio, PR | 6 km (4 mi) | SSW | earthquakes near San Germán Municipio |
| Las Marías Municipio, PR | 9 km (5 mi) | NNE | earthquakes near Las Marías Municipio |
| Maricao Municipio, PR | 9 km (6 mi) | E | earthquakes near Maricao Municipio |
| Hormigueros Municipio, PR | 11 km (7 mi) | WSW | earthquakes near Hormigueros Municipio |
| Sabana Grande Municipio, PR | 11 km (7 mi) | SE | earthquakes near Sabana Grande Municipio |
| Añasco Municipio, PR | 19 km (12 mi) | NW | earthquakes near Añasco 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.
- 2.0 15 km SSW of Guánica, Puerto Rico
- 1.5 9 km SSE of Tallaboa, Puerto Rico
- 1.7 10 km SSE of Tallaboa, Puerto Rico
- 1.9 6 km N of Ponce, Puerto Rico
- 1.9 6 km NW of Puerto Real, Puerto Rico
- 1.7 13 km WNW of Pole Ojea, Puerto Rico
- 1.7 8 km WSW of Puerto Real, Puerto Rico
- 2.1 9 km NW of Puerto Real, Puerto Rico
- 1.9 10 km WNW of Puerto Real, Puerto Rico
- 2.1 7 km WSW of Mayagüez, Puerto Rico
- 2.7 10 km NNW of Puerto Real, Puerto Rico
- 1.9 7 km E of Pole Ojea, Puerto Rico
- 1.9 2 km SE of Aguadilla, Puerto Rico
- 2.4 9 km NW of Puerto Real, Puerto Rico
- 2.2 9 km WNW 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
- 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.