Earthquake · reviewed by a seismologist
M 1.9ml
Earthquake near Avalon, CA
No earthquake was likely felt in Avalon in the 24 hours to 6:07 am PST (14:07 UTC). The last one was M 3.5, 38 km (23 mi) ESE, at 1:22 pm PDT on 5 October 2026, estimated intensity II (weak) in town; 126 felt reports to USGS. Every earthquake near Avalon
This page: a magnitude 1.9 earthquake was recorded 16 km (10 mi) north-northeast of Avalon, CA, at 12:44 pm PDT on 22 August 2021 (19:44 UTC), 17 km deep.
USGS: 16km NNE of Avalon, CA
62 km (39 mi) SSE of Los Angeles, CA · 34 km (21 mi) SW of Huntington Beach, CA
- When
- 12:44 pm PDT on 22 August 2021 ()
- Where
- 16 km (10 mi) north-northeast of Avalon, CA · earthquakes near Avalon
- Magnitude
- M 1.9 (ml)
- Depth
- 17 km below the surface
- Felt
- no reports yet
- Nearest
- Orange County, 49 km ENE
- Nearest mapped fault
- San Pedro Basin fault, 4 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 1907 days ago
Earthquake alerts for Avalon, 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 Avalon, 16 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.
How big was it?
This earthquake released about 23 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 5.8 660,000× the energy of this one
- Magna, Utah 2020 M 5.7 470,000× the energy of this one
- Around the size people start to feel M 3.0 42× the energy of this one
- This earthquake M 1.9 about 23 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:
- 6.4 The 1933 Long Beach, California Earthquake · 29 km NE of this epicentre
- 5.3 7km W of Newport Beach, CA · 28 km NE of this epicentre
- 5.1 The 1941 Torrance-Gardena, California Earthquakes (Second Event) · 35 km N of this epicentre
- 5.0 2km ENE of Westminster, CA · 41 km NE of this epicentre
- 5.0 2 km NE of Carson, California · 42 km N 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 33.4750, -118.2488. Map © OpenStreetMap contributors.
Nearby places
| Place | Distance | Direction from the epicentre | |
|---|---|---|---|
| Orange County, CA | 49 km (30 mi) | ENE | earthquakes near Orange County |
| Los Angeles County, CA | 80 km (50 mi) | N | earthquakes near Los Angeles County |
| Ventura County, CA | 128 km (79 mi) | NW | earthquakes near Ventura County |
Places and coordinates from the US Census Bureau Gazetteer (2024). Distances are from the epicentre.
Aftershocks so far
52 earthquakes have been recorded within 50 km since this one.
- 2.1 10km SE of San Pedro, CA
- 1.8 23km ENE of Avalon, CA
- 2.0 17km SSE of San Pedro, CA
- 1.7 10km SW of Laguna Beach, CA
- 2.0 21km S of San Pedro, CA
- 1.8 5km SSE of San Pedro, CA
- 1.6 5km SSE of San Pedro, CA
- 2.1 3km NE of Gardena, CA
- 1.8 28km SW of Dana Point, CA
- 1.9 23km WSW of Dana Point, CA
- 1.6 1km ENE of Carson, CA
- 2.0 22km SW of Huntington Beach, CA
- 2.3 3km ESE of Carson, CA
- 1.5 2km ESE of Carson, CA
- 1.9 3km ESE of Carson, 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.