Earthquake · reviewed by a seismologist
M 3.1md
109 km N of Suárez, Puerto Rico
Yes. A magnitude 3.1 earthquake was recorded 109 km N of Suárez, Puerto Rico, at 8:03 am AST on 7 July 2017 (12:03 UTC), 14 km deep. 1 person has reported feeling it to USGS.
- When
- Magnitude
- M 3.1 (md)
- Depth
- 14 km below the surface
- Felt
- 1 report · strongest reported intensity I
- Nearest
- Loíza Municipio, 109 km S
- Status
- Reviewed by a seismologist
USGS · last changed by USGS · we first saw it 3415 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 39 km (24 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 1,300 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 4.1 would have released about 32 times as much.
- Northridge, California 1994 M 6.7 250,000× the energy of this one
- Mineral, Virginia 2011 M 5.8 11,000× the energy of this one
- Magna, Utah 2020 M 5.7 7,900× the energy of this one
- This earthquake M 3.1 about 1,300 lb of TNT
- Around the size people start to feel M 3.0 this one released 1.4× 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
No earthquake of M4 or more has been recorded within 50 km since our catalogue begins in 2016.
Before 2016, the USGS record lists one earthquake of M5 or more within 50 km:
- 5.1 92 km N of Suárez, Puerto Rico · 19 km SSE 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 19.4161, -65.7985. Map © OpenStreetMap contributors.
Nearby places
| Place | Distance | Direction from the epicentre | |
|---|---|---|---|
| Loíza Municipio, PR | 109 km (68 mi) | S | earthquakes near Loíza Municipio |
| San Juan Municipio, PR | 114 km (71 mi) | SSW | earthquakes near San Juan Municipio |
| Cataño Municipio, PR | 114 km (71 mi) | SSW | earthquakes near Cataño Municipio |
| Toa Baja Municipio, PR | 114 km (71 mi) | SSW | earthquakes near Toa Baja Municipio |
| Carolina Municipio, PR | 115 km (71 mi) | S | earthquakes near Carolina Municipio |
| Dorado Municipio, PR | 116 km (72 mi) | SSW | earthquakes near Dorado Municipio |
Places and coordinates from the US Census Bureau Gazetteer (2024). Distances are from the epicentre.
Aftershocks so far
41 earthquakes have been recorded within 50 km since this one.
- 3.0 101 km NNE of Vieques, Puerto Rico
- 3.3 114 km N of San Juan, Puerto Rico
- 3.4 128 km N of San Juan, Puerto Rico
- 3.1 77 km N of San Juan, Puerto Rico
- 3.4 97 km NNE of Suárez, Puerto Rico
- 3.0 121 km N of Suárez, Puerto Rico
- 3.2 98 km N of San Juan, Puerto Rico
- 3.6 98 km NNE of Vieques, Puerto Rico
- 3.3 Puerto Rico region
- 3.4 93 km N of San Juan, Puerto Rico
- 3.2 87 km N of San Juan, Puerto Rico
- 3.2 95 km N of Suárez, Puerto Rico
- 3.4 75 km NNE of Vieques, Puerto Rico
- 2.4 75 km N of Suárez, Puerto Rico
- 3.1 67 km NNE 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.