Earthquake · reviewed by a seismologist
M 2.0ml
Earthquake near Walnut, CA
No earthquake was likely felt in Walnut in the 24 hours to 6:51 am PST (14:51 UTC). The last one was M 3.2, 39 km (24 mi) SW, at 12:44 am PDT on 9 October 2026, estimated intensity II (weak) in town; 1,090 felt reports to USGS. Every earthquake near Walnut
This page: a magnitude 2.0 earthquake was recorded 4 km (3 mi) north-northeast of Walnut, CA, at 2:28 pm PDT on 30 October 2020 (21:28 UTC), 13 km deep.
USGS: 4km NNE of Walnut, CA
6 km (4 mi) E of West Covina, CA · 52 km (32 mi) E of Los Angeles, CA
- When
- 2:28 pm PDT on 30 October 2020 ()
- Where
- 4 km (3 mi) north-northeast of Walnut, CA · earthquakes near Walnut
- Magnitude
- M 2.0 (ml)
- Depth
- 13 km below the surface
- Felt
- no reports yet
- Nearest
- Los Angeles County, 41 km WNW
- Nearest mapped fault
- Sierra Madre fault, 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 2201 days ago
Earthquake alerts for Walnut, CA
Get a notification in this browser when USGS records an earthquake near Walnut, CA. No account or email needed.
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 10 km (6 mi) from the epicentre. In Walnut, 4 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.
Likely felt in: Walnut 4 km, intensity II · Diamond Bar 5 km, intensity II · Covina 6 km, intensity II · San Dimas 7 km, intensity II · Pomona 9 km, intensity II · La Verne 9 km, intensity II · West Covina 9 km, intensity II · Glendora 9 km, intensity II. Estimated for each town centre; each link is that town's own record.
How big was it?
This earthquake released about 35 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 3.0 would have released about 32 times as much.
- Mineral, Virginia 2011 M 5.8 440,000× the energy of this one
- Magna, Utah 2020 M 5.7 310,000× the energy of this one
- Around the size people start to feel M 3.0 28× the energy of this one
- This earthquake M 2.0 about 35 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
The largest earthquake within 50 km since 2016 was M 4.5 on 2020-09-19 — about 5,600 times the energy of this one.
Before 2016, the USGS record lists 12 earthquakes of M5 or more within 50 km; the five largest:
- 6.4 The 1933 Long Beach, California Earthquake · 49 km SSW of this epicentre
- 5.9 The 1987 Whittier Narrows, California Earthquake · 21 km W of this epicentre
- 5.8 The 1991 Sierra Madre, California Earthquake · 27 km NNW of this epicentre
- 5.5 The 1990 Upland, California Earthquake · 17 km NE of this epicentre
- 5.4 5km S of Chino Hills, CA · 14 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 34.0568, -117.8457. Map © OpenStreetMap contributors.
Nearby places
| Place | Distance | Direction from the epicentre | |
|---|---|---|---|
| Los Angeles County, CA | 41 km (26 mi) | WNW | earthquakes near Los Angeles County |
| Orange County, CA | 43 km (27 mi) | S | earthquakes near Orange County |
| Ventura County, CA | 123 km (76 mi) | WNW | earthquakes near Ventura County |
| San Diego County, CA | 152 km (94 mi) | SE | earthquakes near San Diego County |
Places and coordinates from the US Census Bureau Gazetteer (2024). Distances are from the epicentre.
Aftershocks so far
53 earthquakes have been recorded within 50 km since this one.
- 1.6 5km SSE of Home Gardens, CA
- 2.9 7km NNE of Rancho Cucamonga, CA
- 2.1 7km N of Fontana, CA
- 1.6 7km ESE of Yorba Linda, CA
- 1.8 4km SE of Home Gardens, CA
- 1.6 11km WNW of Corona, CA
- 1.8 4km SE of Home Gardens, CA
- 1.9 2km SE of Home Gardens, CA
- 2.2 14km NNE of Glendora, CA
- 1.7 5km WSW of Lytle Creek, CA
- 1.7 2km W of Willowbrook, CA
- 3.5 2km W of Willowbrook, CA
- 1.5 10km SW of Corona, CA
- 2.1 5km W of Devore, CA
- 2.0 8km E of Yorba Linda, 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.