quarry blast · reviewed by a seismologist
M 1.6ml
Earthquake near Fillmore, CA
No earthquake was likely felt in Fillmore in the 24 hours to 3:22 am PST (11:22 UTC). The last one was M 3.8, 14 km (9 mi) E, at 8:00 pm PDT on 29 September 2026, estimated intensity III (weak) in town; 199 felt reports to USGS. Every earthquake near Fillmore
No: USGS classifies this as a quarry blast, not an earthquake. A magnitude 1.6 quarry blast was recorded 3 km (2 mi) east-southeast of Fillmore, CA, at 2:00 pm PDT on 17 October 2018 (21:00 UTC), less than 1 km deep.
USGS: 3km ESE of Fillmore, CA
60 km (37 mi) NW of Los Angeles, CA · 19 km (12 mi) NW of Simi Valley, CA
- When
- 2:00 pm PDT on 17 October 2018 ()
- Where
- 3 km (2 mi) east-southeast of Fillmore, CA · earthquakes near Fillmore
- Magnitude
- M 1.6 (ml)
- Depth
- -0.5 km below the surface
- Felt
- no reports yet
- Nearest
- Ventura County, 23 km W
- Nearest mapped fault
- Oak Ridge fault, under 1 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 2942 days ago
Earthquake alerts for Fillmore, 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, people at rest would likely notice it out to about 11 km (7 mi) from the epicentre. In Fillmore, 3 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 9 km, intensity II. Estimated for each town centre; each link is that town's own record.
USGS catalogues this as quarry blast, not an earthquake.
How big was it?
This earthquake released about 7.6 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 2,000,000× the energy of this one
- Magna, Utah 2020 M 5.7 1,400,000× the energy of this one
- Around the size people start to feel M 3.0 130× the energy of this one
- This earthquake M 1.6 about 7.6 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 4.1 on 2016-03-12 — about 6,200 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 · 38 km ESE of this epicentre
- 6.6 1971 San Fernando Earthquake, California · 47 km E of this epicentre
- 5.9 1km ENE of Granada Hills, California · 38 km ESE of this epicentre
- 5.8 10km SSW of Agua Dulce, CA · 47 km E of this epicentre
- 5.8 10km SSW of Agua Dulce, CA · 47 km E 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 34.3893, -118.8860. Map © OpenStreetMap contributors.
Nearby places
| Place | Distance | Direction from the epicentre | |
|---|---|---|---|
| Ventura County, CA | 23 km (14 mi) | W | earthquakes near Ventura County |
| Los Angeles County, CA | 61 km (38 mi) | ESE | earthquakes near Los Angeles County |
| Santa Barbara County, CA | 107 km (66 mi) | W | earthquakes near Santa Barbara County |
| Kern County, CA | 107 km (67 mi) | N | earthquakes near Kern County |
| Orange County, CA | 129 km (80 mi) | SE | earthquakes near Orange County |
Places and coordinates from the US Census Bureau Gazetteer (2024). Distances are from the epicentre.
Aftershocks so far
41 earthquakes have been recorded within 50 km since this one.
- 2.2 8km SW of Lake Hughes, CA
- 1.5 14km N of Castaic, CA
- 2.8 2km ESE of Pacoima, CA
- 1.6 18km S of Camarillo, CA
- 2.1 22km N of Ojai, CA
- 1.6 2km ESE of Northridge, CA
- 2.7 6km SSW of Malibu Beach, CA
- 1.8 7km NE of Ventura, CA
- 2.1 4km NNE of Granada Hills, CA
- 1.9 2km W of Chatsworth, CA
- 2.8 14km N of Castaic, CA
- 1.9 13km N of Castaic, CA
- 1.9 3km ENE of Granada Hills, CA
- 2.6 6km SSW of Sherman Oaks, CA
- 1.6 8km SSW of Gorman, 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.