Earthquake · reviewed by a seismologist
M 1.6md
Earthquake near Loma Rica, CA
No earthquake was likely felt in Loma Rica in the 24 hours to 6:56 am PST (14:56 UTC). The last one was M 5.6, 156 km (97 mi) W, at 8:10 am PDT on 24 June 2026, estimated intensity III (weak) in town; 5,311 felt reports to USGS. Every earthquake near Loma Rica
This page: a magnitude 1.6 earthquake was recorded 10 km (6 mi) east of Loma Rica, CA, at 4:18 am PDT on 11 May 2020 (11:18 UTC), 12 km deep.
USGS: 10km E of Loma Rica, CA
86 km (53 mi) N of Sacramento, CA · 36 km (23 mi) NE of Yuba City, CA
- When
- 4:18 am PDT on 11 May 2020 ()
- Where
- 10 km (6 mi) east of Loma Rica, CA · earthquakes near Loma Rica
- Magnitude
- M 1.6 (md)
- Depth
- 12 km below the surface
- Felt
- no reports yet
- Nearest
- Yuba County, 7 km SSW
- Nearest mapped fault
- Foothills fault system, 7 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 2377 days ago
Earthquake alerts for Loma Rica, 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 it was probably too small to be felt, even directly above it. In Loma Rica, 10 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: Lake Wildwood, Challenge-Brownsville, Penn Valley, Palermo, Grass Valley, Beale Air Force Base.
How big was it?
This earthquake released about 7.3 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 2.6 would have released about 32 times as much.
- Mineral, Virginia 2011 M 5.8 2,100,000× the energy of this one
- Magna, Utah 2020 M 5.7 1,500,000× the energy of this one
- Around the size people start to feel M 3.0 130× the energy of this one
- This earthquake M 1.6 about 7.3 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.
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 5 earthquakes of M5 or more within 50 km:
- 5.9 West of Downieville, California · 32 km NE of this epicentre
- 5.7 The 1975 Oroville, California Earthquake · 24 km WNW of this epicentre
- 5.2 4 km E of Palermo, California · 20 km NW of this epicentre
- 5.1 5 km ENE of Palermo, California · 20 km NW of this epicentre
- 5.0 Nevada County, California · 36 km ENE 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 39.3280, -121.3053. Map © OpenStreetMap contributors.
Nearby places
| Place | Distance | Direction from the epicentre | |
|---|---|---|---|
| Yuba County, CA | 7 km (5 mi) | SSW | earthquakes near Yuba County |
| Butte County, CA | 45 km (28 mi) | NW | earthquakes near Butte County |
| Nevada County, CA | 46 km (29 mi) | E | earthquakes near Nevada County |
| Sutter County, CA | 47 km (29 mi) | SW | earthquakes near Sutter County |
| Placer County, CA | 58 km (36 mi) | ESE | earthquakes near Placer County |
| Sierra County, CA | 73 km (45 mi) | ENE | earthquakes near Sierra County |
Places and coordinates from the US Census Bureau Gazetteer (2024). Distances are from the epicentre.
Aftershocks so far
29 earthquakes have been recorded within 50 km since this one.
- 2.0 6 km E of Challenge-Brownsville, CA
- 2.1 8 km WNW of La Porte, CA
- 2.1 7 km ESE of Challenge-Brownsville, CA
- 1.9 5 km WSW of Concow, CA
- 2.2 9 km SSW of South Yuba City, CA
- 1.8 8 km NNE of Oroville East, CA
- 1.7 8 km NNE of Oroville East, CA
- 2.1 12 km W of La Porte, CA
- 2.1 10km N of Oroville, CA
- 2.0 5km SSE of Oroville East, CA
- 2.3 10km WNW of Little Grass Valley, CA
- 4.2 5km S of Oroville East, CA
- 1.8 10km N of Oroville, CA
- 2.0 10km N of Oroville, CA
- 2.0 9km N of Oroville, 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.