Earthquake · reviewed by a seismologist
M 3.1ml
Earthquake near Piru, CA
No earthquake was likely felt in Piru in the 24 hours to 5:41 am PST (13:41 UTC). The last one was M 2.2, 16 km (10 mi) E, at 8:32 am PDT on 18 October 2026, estimated intensity II (weak) in town; 16 felt reports to USGS. Every earthquake near Piru
This page: a magnitude 3.1 earthquake was recorded 13 km (8 mi) north-northwest of Piru, CA, at 7:51 pm PST on 2 December 2024 (03:51 UTC), 15 km deep. 38 people have reported feeling it to USGS.
USGS: 13 km NNW of Piru, CA
69 km (43 mi) NW of Los Angeles, CA · 29 km (18 mi) NNW of Simi Valley, CA
- When
- 7:51 pm PST on 2 December 2024 ()
- Where
- 13 km (8 mi) north-northwest of Piru, CA · earthquakes near Piru
- Magnitude
- M 3.1 (ml)
- Depth
- 15 km below the surface
- Felt
- 38 reports · strongest reported intensity III
- Nearest
- Ventura County, 30 km SW
- Nearest mapped fault
- Santa Ynez fault, 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 635 days ago
Earthquake alerts for Piru, 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 small earthquake. Shaking like this is often felt indoors nearby and very rarely causes damage.
At this magnitude and depth, people at rest would likely notice it out to about 39 km (24 mi) from the epicentre. In Piru, 13 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: Piru 13 km, intensity II · Santa Paula 25 km, intensity II · Valencia 25 km, intensity II · Moorpark 25 km, intensity II · Simi Valley 28 km, intensity II · Santa Clarita 33 km, intensity II · Ojai 35 km, intensity II · Frazier Park 35 km, intensity II. Estimated for each town centre; each link is that town's own record.
How big was it?
This earthquake released about 1,300 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 4.1 would have released about 32 times as much.
- Northridge, California 1994 M 6.7 250,000× the energy of this one
- Mineral, Virginia 2011 M 5.8 11,000× the energy of this one
- Magna, Utah 2020 M 5.7 7,900× the energy of this one
- This earthquake M 3.1 about 1,300 lb of TNT
- Around the size people start to feel M 3.0 this one released 1.4× 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 since 2016 was M 5.1 on 2023-08-20 — about 930 times the energy of this one.
Before 2016, the USGS record lists 19 earthquakes of M5 or more within 50 km; the five largest:
- 6.7 Northridge, California, earthquake · 45 km SE of this epicentre
- 6.6 1971 San Fernando Earthquake, California · 47 km ESE of this epicentre
- 6.0 Tejon Pass, California · 43 km N of this epicentre
- 5.9 1km ENE of Granada Hills, California · 43 km SE of this epicentre
- 5.8 10km SSW of Agua Dulce, CA · 47 km ESE 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 34.5125, -118.8682. Map © OpenStreetMap contributors.
Nearby places
| Place | Distance | Direction from the epicentre | |
|---|---|---|---|
| Ventura County, CA | 30 km (18 mi) | SW | earthquakes near Ventura County |
| Los Angeles County, CA | 66 km (41 mi) | ESE | earthquakes near Los Angeles County |
| Kern County, CA | 94 km (58 mi) | N | earthquakes near Kern County |
| Santa Barbara County, CA | 107 km (67 mi) | W | earthquakes near Santa Barbara County |
| Orange County, CA | 137 km (85 mi) | SE | earthquakes near Orange County |
Places and coordinates from the US Census Bureau Gazetteer (2024). Distances are from the epicentre.
Aftershocks so far
38 earthquakes have been recorded within 50 km since this one.
- 1.7 1 km NW of Pacoima, CA
- 1.9 6 km W of Chatsworth, CA
- 1.6 5 km NE of Ventura, CA
- 2.3 11 km ENE of Pine Mountain Club, CA
- 1.6 7 km ESE of Santa Clarita, CA
- 1.9 12 km SE of Gorman, CA
- 1.7 3 km ENE of San Fernando, CA
- 1.6 2 km S of Frazier Park, CA
- 1.9 13 km NNW of Piru, CA
- 2.3 16 km NNW of Fillmore, CA
- 1.9 5 km SSW of Frazier Park, CA
- 2.0 16 km NNW of Fillmore, CA
- 1.5 22 km NNE of Ojai, CA
- 1.6 2 km SW of Ojai, CA
- 2.0 10 km NW of Malibu, 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.