Earthquake · reviewed by a seismologist
M 1.7md
3km NNW of Byron, CA
- When
- Magnitude
- M 1.7 (md)
- Depth
- 4.0 km below the surface
- Felt
- no reports yet
- Nearest
- Contra Costa County, 27 km W
- Status
- Reviewed by a seismologist
USGS · last changed by USGS · we first saw it 1894 days ago
This was a minor earthquake. Quakes this small are rarely felt and do not cause damage.
How big was it?
This earthquake released about 9.3 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 2.7 would have released about 32 times as much.
- Mineral, Virginia 2011 M 5.8 1,600,000× the energy of this one
- Magna, Utah 2020 M 5.7 1,100,000× the energy of this one
- Around the size people start to feel M 3.0 100× the energy of this one
- This earthquake M 1.7 about 9.3 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.
Where
Epicentre 37.8950, -121.6478. Map © OpenStreetMap contributors.
Nearby places
| Place | Distance | Direction | |
|---|---|---|---|
| Contra Costa County, CA | 27 km (17 mi) | E of here | earthquakes near Contra Costa County |
| San Joaquin County, CA | 33 km (21 mi) | W of here | earthquakes near San Joaquin County |
| Alameda County, CA | 36 km (22 mi) | NE of here | earthquakes near Alameda County |
| Solano County, CA | 49 km (30 mi) | SSE of here | earthquakes near Solano County |
| Sacramento County, CA | 67 km (42 mi) | SSW of here | earthquakes near Sacramento County |
| Stanislaus County, CA | 68 km (42 mi) | WNW of here | earthquakes near Stanislaus County |
Places and coordinates from the US Census Bureau Gazetteer (2024). Distances are from the epicentre.
Aftershocks so far
53 earthquakes have been recorded within 50 km since this one.
- 2.0 9km SW of Brentwood, CA
- 1.6 1km SW of Alamo, CA
- 1.6 10km NE of Milpitas, CA
- 1.5 3km SSW of Clayton, CA
- 1.9 1km S of San Ramon, CA
- 1.6 9km SE of Sunol, CA
- 1.6 5km SW of Clayton, CA
- 2.8 16km SSE of Livermore, CA
- 2.1 4km WSW of Alamo, CA
- 2.1 6km SSW of Moraga, CA
- 1.9 5km SW of Pacheco, CA
- 1.8 2km SE of Pacheco, CA
- 1.6 1km S of Blackhawk, CA
- 2.7 0km N of Byron, CA
- 2.0 19km NE of Alum Rock, CA
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.
For this area
The largest earthquake within 50 km in our catalogue was M 4.5 on 2019-10-15 — it released about 16,000 times the energy of this one.
From the QuakeIndex catalogue, built from the USGS FDSN event service.
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.