Earthquake · reviewed by a seismologist
M 1.9md
19 km N of Charlotte Amalie, U.S. Virgin Islands
Yes. A magnitude 1.9 earthquake was recorded 19 km N of Charlotte Amalie, U.S. Virgin Islands, at 1:45 am AST on 7 August 2017 (05:45 UTC), 14 km deep.
- When
- Magnitude
- M 1.9 (md)
- Depth
- 14 km below the surface
- Felt
- no reports yet
- Nearest
- Culebra Municipio, 43 km WSW
- Status
- Reviewed by a seismologist
USGS · last changed by USGS · we first saw it 3383 days ago
Earthquake alerts for Culebra, 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, people at rest would likely notice it out to about 3 km (2 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 19 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 2.9 would have released about 32 times as much.
- Mineral, Virginia 2011 M 5.8 810,000× the energy of this one
- Magna, Utah 2020 M 5.7 580,000× the energy of this one
- Around the size people start to feel M 3.0 51× the energy of this one
- This earthquake M 1.9 about 19 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
No earthquake of M4 or more has been recorded within 50 km since our catalogue begins in 2016.
Before 2016, the USGS record lists 2 earthquakes of M5 or more within 50 km:
- 5.2 36 km NNE of Cruz Bay, U.S. Virgin Islands · 30 km ENE of this epicentre
- 5.0 40 km NNE of Cruz Bay, U.S. Virgin Islands · 36 km ENE of this epicentre
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 18.5155, -64.9498. Map © OpenStreetMap contributors.
Nearby places
| Place | Distance | Direction from the epicentre | |
|---|---|---|---|
| Culebra Municipio, PR | 43 km (27 mi) | WSW | earthquakes near Culebra Municipio |
| Vieques Municipio, PR | 67 km (42 mi) | SW | earthquakes near Vieques Municipio |
| Fajardo Municipio, PR | 69 km (43 mi) | WSW | earthquakes near Fajardo Municipio |
| Ceiba Municipio, PR | 77 km (48 mi) | WSW | earthquakes near Ceiba Municipio |
| Luquillo Municipio, PR | 82 km (51 mi) | WSW | earthquakes near Luquillo Municipio |
| Naguabo Municipio, PR | 90 km (56 mi) | WSW | earthquakes near Naguabo Municipio |
Places and coordinates from the US Census Bureau Gazetteer (2024). Distances are from the epicentre.
Aftershocks so far
43 earthquakes have been recorded within 50 km since this one.
- 4.2 48 km N of Charlotte Amalie, U.S. Virgin Islands
- 3.4 52 km N of Charlotte Amalie, U.S. Virgin Islands
- 3.3 34 km NW of Charlotte Amalie, U.S. Virgin Islands
- 2.9 59 km N of Charlotte Amalie, U.S. Virgin Islands
- 3.4 51 km N of Charlotte Amalie, U.S. Virgin Islands
- 3.4 37 km N of Culebra, Puerto Rico
- 3.4 56 km N of Charlotte Amalie, U.S. Virgin Islands
- 3.7 50 km NNW of Charlotte Amalie, U.S. Virgin Islands
- 3.1 58 km NNE of Cruz Bay, U.S. Virgin Islands
- 3.8 55 km N of Cruz Bay, U.S. Virgin Islands
- 3.4 58 km NNW of Charlotte Amalie, U.S. Virgin Islands
- 2.2 4 km SE of Charlotte Amalie, U.S. Virgin Islands
- 3.4 47 km N of Charlotte Amalie, U.S. Virgin Islands
- 3.1 65 km NNW of Charlotte Amalie, U.S. Virgin Islands
- 3.7 65 km N of Charlotte Amalie, U.S. Virgin Islands
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.