Earthquake · reviewed by a seismologist
M 3.1md
113 km N of Suárez, Puerto Rico
Yes. A magnitude 3.1 earthquake was recorded 113 km N of Suárez, Puerto Rico, at 3:51 am AST on 15 July 2019 (07:51 UTC), 44 km deep.
- When
- Magnitude
- M 3.1 (md)
- Depth
- 44 km below the surface
- Felt
- no reports yet
- Nearest
- Loíza Municipio, 114 km SSW
- Status
- Reviewed by a seismologist
USGS · last changed by USGS · we first saw it 2601 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 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.
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 6.7 270,000× the energy of this one
- Mineral, Virginia 2011 M 5.8 12,000× the energy of this one
- Magna, Utah 2020 M 5.7 8,500× 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 1.3× 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 since 2016 was M 4.5 on 2018-03-06 — about 130 times the energy of this one.
Before 2016, the USGS record lists 2 earthquakes of M5 or more within 50 km:
- 5.1 122 km NNE of Vieques, Puerto Rico · 42 km E of this epicentre
- 5.1 92 km N of Suárez, Puerto Rico · 21 km S 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 19.4468, -65.7085. Map © OpenStreetMap contributors.
Nearby places
| Place | Distance | Direction from the epicentre | |
|---|---|---|---|
| Loíza Municipio, PR | 114 km (71 mi) | SSW | earthquakes near Loíza Municipio |
| Fajardo Municipio, PR | 119 km (74 mi) | S | earthquakes near Fajardo Municipio |
| Río Grande Municipio, PR | 119 km (74 mi) | S | earthquakes near Río Grande Municipio |
| Carolina Municipio, PR | 120 km (75 mi) | SSW | earthquakes near Carolina Municipio |
| San Juan Municipio, PR | 120 km (75 mi) | SSW | earthquakes near San Juan Municipio |
| Cataño Municipio, PR | 121 km (75 mi) | SSW | earthquakes near Cataño Municipio |
Places and coordinates from the US Census Bureau Gazetteer (2024). Distances are from the epicentre.
Aftershocks so far
28 earthquakes have been recorded within 50 km since this one.
- 3.4 135 km N of San Juan, Puerto Rico
- 3.2 130 km NNE of Vieques, Puerto Rico
- 2.9 126 km N of San Juan, Puerto Rico
- 2.1 81 km NNE of Suárez, Puerto Rico
- 2.8 94 km N of San Juan, Puerto Rico
- 2.5 73 km N of San Juan, Puerto Rico
- 2.8 84 km NNE of Vieques, Puerto Rico
- 3.1 95 km NNE of Luquillo, Puerto Rico
- 2.6 104 km N of Suárez, Puerto Rico
- 2.9 86 km NNE of Vieques, Puerto Rico
- 2.8 80 km NNE of Vieques, Puerto Rico
- 2.4 81 km NNE of Vieques, Puerto Rico
- 2.9 117 km NNE of Vieques, Puerto Rico
- 2.2 80 km NNE of Vieques, Puerto Rico
- 3.1 109 km NNE of Vieques, 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.