Earthquake · reviewed by a seismologist
M 1.7md
9km NW of Grayson, CA
- When
- Magnitude
- M 1.7 (md)
- Depth
- 14 km below the surface
- Felt
- no reports yet
- Nearest
- Stanislaus County, 22 km ESE
- Status
- Reviewed by a seismologist
USGS · last changed by USGS · we first saw it 1432 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 9.6 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 99× the energy of this one
- This earthquake M 1.7 about 9.6 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 37.6310, -121.2385. Map © OpenStreetMap contributors.
Nearby places
| Place | Distance | Direction | |
|---|---|---|---|
| Stanislaus County, CA | 22 km (14 mi) | WNW of here | earthquakes near Stanislaus County |
| San Joaquin County, CA | 34 km (21 mi) | S of here | earthquakes near San Joaquin County |
| Alameda County, CA | 59 km (37 mi) | E of here | earthquakes near Alameda County |
| Santa Clara County, CA | 60 km (38 mi) | NE of here | earthquakes near Santa Clara County |
| Merced County, CA | 67 km (41 mi) | NW of here | earthquakes near Merced County |
| Contra Costa County, CA | 70 km (44 mi) | ESE of here | earthquakes near Contra Costa County |
Places and coordinates from the US Census Bureau Gazetteer (2024). Distances are from the epicentre.
Aftershocks so far
7 earthquakes have been recorded within 50 km since this one.
- 2.0 22km WSW of Gustine, CA
- 2.0 18km SSE of Livermore, CA
- 1.6 13km SSE of Livermore, CA
- 2.9 19km SSE of Livermore, CA
- 1.6 20km NE of Alum Rock, CA
- 1.6 18km WSW of Westley, CA
- 1.6 3km NW of Byron, 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.
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.