Earthquake · reviewed by a seismologist
M 3.3md
Puerto Rico region
Yes. A magnitude 3.3 earthquake was recorded in the Puerto Rico region, at 11:39 pm AST on 12 February 2018 (03:39 UTC), 50 km deep.
- When
- Magnitude
- M 3.3 (md)
- Depth
- 50 km below the surface
- Felt
- no reports yet
- Nearest
- Dorado Municipio, 105 km S
- Status
- Reviewed by a seismologist
USGS · last changed by USGS · we first saw it 3102 days ago
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 7 km (4 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 1.2 tons of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 4.3 would have released about 32 times as much.
- Northridge, California 1994 M 6.7 140,000× the energy of this one
- Mineral, Virginia 2011 M 5.8 6,200× the energy of this one
- Magna, Utah 2020 M 5.7 4,400× the energy of this one
- This earthquake M 3.3 about 1.2 tons of TNT
- Around the size people start to feel M 3.0 this one released 2.5× more
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 4.4 on 2016-10-23 — about 50 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 19.4113, -66.1558. Map © OpenStreetMap contributors.
Nearby places
| Place | Distance | Direction from the epicentre | |
|---|---|---|---|
| Dorado Municipio, PR | 105 km (65 mi) | S | earthquakes near Dorado Municipio |
| Toa Baja Municipio, PR | 106 km (66 mi) | S | earthquakes near Toa Baja Municipio |
| Cataño Municipio, PR | 107 km (67 mi) | S | earthquakes near Cataño Municipio |
| Vega Baja Municipio, PR | 109 km (68 mi) | SSW | earthquakes near Vega Baja Municipio |
| Loíza Municipio, PR | 110 km (68 mi) | SSE | earthquakes near Loíza Municipio |
| Vega Alta Municipio, PR | 110 km (68 mi) | S | earthquakes near Vega Alta Municipio |
Places and coordinates from the US Census Bureau Gazetteer (2024). Distances are from the epicentre.
Aftershocks so far
46 earthquakes have been recorded within 50 km since this one.
- 3.0 75 km N of Tierras Nuevas Poniente, Puerto Rico
- 2.8 Puerto Rico region
- 2.7 67 km N of Brenas, Puerto Rico
- 2.6 68 km N of Brenas, Puerto Rico
- 2.8 80 km N of Tierras Nuevas Poniente, Puerto Rico
- 2.2 74 km N of Brenas, Puerto Rico
- 1.9 73 km N of Brenas, Puerto Rico
- 2.8 74 km N of Brenas, Puerto Rico
- 2.9 74 km N of Brenas, Puerto Rico
- 2.8 67 km N of Brenas, Puerto Rico
- 2.2 72 km N of Brenas, Puerto Rico
- 2.5 82 km N of Tierras Nuevas Poniente, Puerto Rico
- 2.8 84 km N of Tierras Nuevas Poniente, Puerto Rico
- 2.9 91 km N of Brenas, Puerto Rico
- 2.6 78 km N of San Juan, 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.