Earthquake · reviewed by a seismologist
M 2.8md
Puerto Rico region
Yes. A magnitude 2.8 earthquake was recorded in the Puerto Rico region, 60 km (37 mi) NNW of Arecibo, PR, at 2:00 am AST on 24 September 2019 (06:00 UTC), 25 km deep.
60 km (37 mi) NNW of Arecibo, PR · 111 km (69 mi) WNW of San Juan, PR
- When
- Magnitude
- M 2.8 (md)
- Depth
- 25 km below the surface
- Felt
- no reports yet
- Nearest
- Isabela Municipio, 53 km S
- Status
- Reviewed by a seismologist
USGS · last changed by USGS · we first saw it 2605 days ago
Earthquake alerts for Isabela, 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 9 km (6 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 450 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 34,000× the energy of this one
- Magna, Utah 2020 M 5.7 24,000× the energy of this one
- Around the size people start to feel M 3.0 2.1× the energy of this one
- This earthquake M 2.8 about 450 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 6.0 on 2019-09-24 — about 68,000 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 18.9553, -66.9473. Map © OpenStreetMap contributors.
Nearby places
| Place | Distance | Direction from the epicentre | |
|---|---|---|---|
| Isabela Municipio, PR | 53 km (33 mi) | S | earthquakes near Isabela Municipio |
| Quebradillas Municipio, PR | 54 km (34 mi) | S | earthquakes near Quebradillas Municipio |
| Aguadilla Municipio, PR | 57 km (35 mi) | SSW | earthquakes near Aguadilla Municipio |
| Camuy Municipio, PR | 57 km (36 mi) | S | earthquakes near Camuy Municipio |
| Hatillo Municipio, PR | 59 km (37 mi) | SSE | earthquakes near Hatillo Municipio |
| Arecibo Municipio, PR | 65 km (40 mi) | SSE | earthquakes near Arecibo Municipio |
Places and coordinates from the US Census Bureau Gazetteer (2024). Distances are from the epicentre.
Aftershocks so far
58 earthquakes have been recorded within 50 km since this one.
- 2.8 63 km N of San Antonio, Puerto Rico
- 2.9 79 km NNW of San Antonio, Puerto Rico
- 3.0 74 km NNW of San Antonio, Puerto Rico
- 3.0 60 km N of San Antonio, Puerto Rico
- 2.8 68 km N of San Antonio, Puerto Rico
- 2.9 60 km N of Isabela, Puerto Rico
- 2.6 72 km N of Isabela, Puerto Rico
- 2.6 70 km NNW of San Antonio, Puerto Rico
- 2.7 71 km N of San Antonio, Puerto Rico
- 3.2 79 km NNW of San Antonio, Puerto Rico
- 2.7 69 km N of San Antonio, Puerto Rico
- 3.4 69 km N of San Antonio, Puerto Rico
- 2.4 73 km N of San Antonio, Puerto Rico
- 2.5 9 km N of Isabela, Puerto Rico
- 3.0 80 km NNW of San Antonio, 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.