quarry blast · reviewed by a seismologist
M 1.9md
Earthquake near Ione, CA
No earthquake was likely felt in Ione in the 24 hours to 2:19 pm PST (22:19 UTC). The last one was M 1.8, 6 km (4 mi) WNW, at 1:54 pm PDT on 9 July 2026, estimated intensity II (weak) in town. Every earthquake near Ione
No: USGS classifies this as a quarry blast, not an earthquake. A magnitude 1.9 quarry blast was recorded 8 km (5 mi) west-northwest of Ione, CA, at 2:04 pm PDT on 8 August 2022 (21:04 UTC), less than 1 km deep.
USGS: 8km WNW of Ione, CA
45 km (28 mi) ESE of Sacramento, CA · 29 km (18 mi) SE of Rancho Cordova, CA
- When
- 2:04 pm PDT on 8 August 2022 ()
- Where
- 8 km (5 mi) west-northwest of Ione, CA · earthquakes near Ione
- Magnitude
- M 1.9 (md)
- Depth
- -0.6 km below the surface
- Felt
- no reports yet
- Nearest
- Sacramento County, 30 km WNW
- Nearest mapped fault
- Foothills fault system, 9 km from its surface trace — near is not the same as on
- Status
- Reviewed by a seismologist
USGS · last changed by USGS · we first saw it 1557 days ago
Earthquake alerts for Ione, CA
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Alerts are on for .
Not a warning. An alert comes after USGS publishes a quake, usually minutes after the shaking. For early warning use ShakeAlert, through your phone's Wireless Emergency Alerts or the MyShake app.
This was a minor earthquake. Quakes this small are rarely felt and do not cause damage.
At this magnitude and depth, people at rest would likely notice it out to about 15 km (9 mi) from the epicentre. In Ione, 8 km away, the estimate is intensity II (weak). 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.
Earthquakes near other towns within 30 km: Clay, Rancho Murieta, Sutter Creek, Dogtown, Jackson, Herald.
USGS catalogues this as quarry blast, not an earthquake.
How big was it?
This earthquake released about 22 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 2.9 would have released about 32 times as much.
- Mineral, Virginia 2011 M 5.8 680,000× the energy of this one
- Magna, Utah 2020 M 5.7 480,000× the energy of this one
- Around the size people start to feel M 3.0 43× the energy of this one
- This earthquake M 1.9 about 22 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.
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 since 1900 lists no earthquake of M5 or more within 50 km.
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 38.3803, -121.0120. Map © OpenStreetMap contributors.
Nearby places
| Place | Distance | Direction from the epicentre | |
|---|---|---|---|
| Sacramento County, CA | 30 km (19 mi) | WNW | earthquakes near Sacramento County |
| Amador County, CA | 32 km (20 mi) | ENE | earthquakes near Amador County |
| Calaveras County, CA | 45 km (28 mi) | ESE | earthquakes near Calaveras County |
| San Joaquin County, CA | 54 km (34 mi) | SSW | earthquakes near San Joaquin County |
| El Dorado County, CA | 61 km (38 mi) | NE | earthquakes near El Dorado County |
| Placer County, CA | 80 km (50 mi) | NNE | earthquakes near Placer County |
Places and coordinates from the US Census Bureau Gazetteer (2024). Distances are from the epicentre.
Aftershocks so far
4 earthquakes have been recorded within 50 km since this one.
- 1.8 1 km WSW of Granite Bay, CA
- 1.8 6 km WNW of Ione, CA
- 2.1 2 km WSW of Granite Bay, CA
- 2.6 2 km NW of Granite Bay, 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.