Earthquake · reviewed by a seismologist
M 4.6mw
Earthquake near Brawley, CA
No earthquake was likely felt in Brawley in the 24 hours to 5:40 am PST (13:40 UTC). The last one was M 4.9, 69 km (43 mi) SSE, at 10:27 am PST on 3 November 2026, estimated intensity III (weak) in town; 321 felt reports to USGS. Every earthquake near Brawley
This page: a magnitude 4.6 earthquake was recorded 33 km (21 mi) north-northwest of Brawley, CA, at 8:56 am PDT on 10 August 2020 (15:56 UTC), 2.1 km deep. 87 people have reported feeling it to USGS.
USGS: 12km SSE of Bombay Beach, CA
- When
- 8:56 am PDT on 10 August 2020 ()
- Where
- 33 km (21 mi) north-northwest of Brawley, CA · earthquakes near Brawley
- Magnitude
- M 4.6 (mw)
- Depth
- 2.1 km below the surface
- Felt
- 87 reports · strongest reported intensity IV
- Measured shaking
- intensity IV (ShakeMap)
- USGS impact alert
- green
- Nearest
- Imperial County, 39 km SE
- Nearest mapped fault
- Brawley Seismic Zone, 2 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 2213 days ago
Earthquake alerts for Brawley, 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 light earthquake. It is usually felt clearly nearby and can rattle windows and dishes, but damage is uncommon.
At this magnitude and depth, people at rest would likely notice it out to about 148 km (92 mi) from the epicentre. In Brawley, 33 km away, the estimate is intensity III (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.
Likely felt in: Calipatria 21 km, intensity IV · Salton City 25 km, intensity IV · Brawley 33 km, intensity III · Imperial 46 km, intensity III. Estimated for each town centre; each link is that town's own record.
How big was it?
This earthquake released about 120 tons of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 5.6 would have released about 32 times as much.
- Northridge, California 1994 M 6.7 1,500× the energy of this one
- Mineral, Virginia 2011 M 5.8 65× the energy of this one
- Magna, Utah 2020 M 5.7 46× the energy of this one
- This earthquake M 4.6 about 120 tons of TNT
- Around the size people start to feel M 3.0 this one released 240× 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 (31 mi) since our catalogue begins in 2016. The previous largest was M 4.5 on 2020-05-10.
Before 2016, the USGS record lists 32 earthquakes of M5 or more within 50 km; the five largest:
- 6.6 The 1942 Fish Creek Mountains, California Earthquake · 31 km SSW of this epicentre
- 6.6 The 1968 Borrego Mountain, California Earthquake · 39 km W of this epicentre
- 6.6 The 1987 Superstition Hills, California Earthquake · 30 km SSW of this epicentre
- 6.4 The 1954 San Jacinto Fault, California Earthquake · 37 km W of this epicentre
- 6.3 The 1906 Imperial Valley, California Earthquake · 42 km SSE 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 33.2468, -115.6900. Map © OpenStreetMap contributors.
Nearby places
| Place | Distance | Direction from the epicentre | |
|---|---|---|---|
| Imperial County, CA | 39 km (24 mi) | SE | earthquakes near Imperial County |
| Riverside County, CA | 61 km (38 mi) | NNW | earthquakes near Riverside County |
| San Diego County, CA | 104 km (65 mi) | WSW | earthquakes near San Diego County |
Places and coordinates from the US Census Bureau Gazetteer (2024). Distances are from the epicentre.
Aftershocks so far
60 earthquakes have been recorded within 50 km since this one.
- 1.5 14km SSE of Bombay Beach, CA
- 1.5 13km SSE of Bombay Beach, CA
- 1.5 10km SSE of Bombay Beach, CA
- 1.9 11km SE of Bombay Beach, CA
- 1.7 10km SSE of Bombay Beach, CA
- 2.8 10km SSE of Bombay Beach, CA
- 2.1 11km SSE of Bombay Beach, CA
- 3.5 14km SSE of Bombay Beach, CA
- 1.7 10km SSE of Bombay Beach, CA
- 2.2 11km SE of Bombay Beach, CA
- 2.0 11km SE of Bombay Beach, CA
- 2.1 11km SSE of Bombay Beach, CA
- 1.8 10km SSE of Bombay Beach, CA
- 1.8 12km SSE of Bombay Beach, CA
- 1.6 14km SSE of Bombay Beach, 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.