Earthquake · reviewed by a seismologist
M 1.6ml
Earthquake near Walnut, CA
No earthquake was likely felt in Walnut in the 24 hours to 2:25 am PST (10:25 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 1.6 earthquake was recorded in Walnut, CA, at 12:30 am PST on 10 January 2018 (08:30 UTC), 15 km deep.
USGS: 2km W of Walnut, CA
in West Covina, CA · 49 km (30 mi) E of Los Angeles, CA
- When
- 12:30 am PST on 10 January 2018 ()
- Where
- in Walnut, CA · earthquakes near Walnut
- Magnitude
- M 1.6 (ml)
- Depth
- 15 km below the surface
- Felt
- no reports yet
- Nearest
- Orange County, 39 km SSE
- Nearest mapped fault
- Sierra Madre fault, 13 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 3228 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 it was probably too small to be felt, even directly above it. 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: South San Jose Hills, Rowland Heights, La Puente, Valinda, Diamond Bar, West Covina.
How big was it?
This earthquake released about 9 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 1,700,000× the energy of this one
- Magna, Utah 2020 M 5.7 1,200,000× the energy of this one
- Around the size people start to feel M 3.0 110× the energy of this one
- This earthquake M 1.6 about 9 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 14 earthquakes of M5 or more within 50 km; the five largest:
- 6.4 The 1933 Long Beach, California Earthquake · 44 km SSW of this epicentre
- 5.9 The 1987 Whittier Narrows, California Earthquake · 19 km WNW of this epicentre
- 5.8 The 1991 Sierra Madre, California Earthquake · 30 km NNW of this epicentre
- 5.5 The 1990 Upland, California Earthquake · 22 km NE of this epicentre
- 5.4 5km S of Chino Hills, CA · 13 km SE 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 34.0175, -117.8828. Map © OpenStreetMap contributors.
Nearby places
| Place | Distance | Direction from the epicentre | |
|---|---|---|---|
| Orange County, CA | 39 km (24 mi) | SSE | earthquakes near Orange County |
| Los Angeles County, CA | 40 km (25 mi) | WNW | earthquakes near Los Angeles County |
| Ventura County, CA | 121 km (75 mi) | WNW | earthquakes near Ventura County |
| San Diego County, CA | 151 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
47 earthquakes have been recorded within 50 km since this one.
- 1.8 1km E of South Whittier, CA
- 1.6 8km N of Fontana, CA
- 2.2 12km S of Seal Beach, CA
- 1.9 4km SW of Sunland, CA
- 1.8 8km ESE of Wrightwood, CA
- 2.5 3km ENE of Upland, CA
- 2.5 3km N of Huntington Park, CA
- 1.6 1km E of Yorba Linda, CA
- 1.6 12km NE of Trabuco Canyon, CA
- 1.6 4km SE of Home Gardens, CA
- 2.1 3km SSE of Huntington Beach, CA
- 1.6 2km SE of Fontana, CA
- 1.6 7km SSE of Home Gardens, CA
- 1.6 4km SSE of Home Gardens, CA
- 2.0 5km SSW of Lytle Creek, 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.