Earthquake · reviewed by a seismologist
M 1.7ml
Earthquake near Fillmore, CA
No earthquake was likely felt in Fillmore in the 24 hours to 10:23 am PST (18:23 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
This page: a magnitude 1.7 earthquake was recorded 7 km (5 mi) north-northwest of Fillmore, CA, at 11:30 am PDT on 28 March 2018 (18:30 UTC), 8.8 km deep.
USGS: 7km NNW of Fillmore, CA
70 km (43 mi) NW of Los Angeles, CA · 27 km (17 mi) NNE of Camarillo, CA
- When
- 11:30 am PDT on 28 March 2018 ()
- Where
- 7 km (5 mi) north-northwest of Fillmore, CA · earthquakes near Fillmore
- Magnitude
- M 1.7 (ml)
- Depth
- 8.8 km below the surface
- Felt
- no reports yet
- Nearest
- Ventura County, 19 km SW
- Nearest mapped fault
- San Cayetano fault, 2 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 3031 days ago
Earthquake alerts for Fillmore, CA
Get a notification in this browser when USGS records an earthquake near Fillmore, 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 8 km (5 mi) from the epicentre. In Fillmore, 7 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.
Earthquakes near other towns within 30 km: Santa Paula, Piru, Moorpark, Ojai, Saticoy, Simi Valley.
How big was it?
This earthquake released about 10 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 2.7 would have released about 32 times as much.
- Mineral, Virginia 2011 M 5.8 1,500,000× the energy of this one
- Magna, Utah 2020 M 5.7 1,000,000× the energy of this one
- Around the size people start to feel M 3.0 92× the energy of this one
- This earthquake M 1.7 about 10 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 4,600 times the energy of this one.
Before 2016, the USGS record lists 15 earthquakes of M5 or more within 50 km; the five largest:
- 6.7 Northridge, California, earthquake · 47 km SE of this epicentre
- 6.0 Tejon Pass, California · 50 km N of this epicentre
- 5.9 1km ENE of Granada Hills, California · 47 km ESE of this epicentre
- 5.6 7km NNE of Simi Valley, California · 28 km ESE of this epicentre
- 5.5 Southwest of Tejon Pass, California · 27 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 34.4568, -118.9583. Map © OpenStreetMap contributors.
Nearby places
| Place | Distance | Direction from the epicentre | |
|---|---|---|---|
| Ventura County, CA | 19 km (12 mi) | SW | earthquakes near Ventura County |
| Los Angeles County, CA | 70 km (44 mi) | ESE | earthquakes near Los Angeles County |
| Santa Barbara County, CA | 99 km (62 mi) | W | earthquakes near Santa Barbara County |
| Kern County, CA | 101 km (63 mi) | NNE | earthquakes near Kern County |
| Orange County, CA | 139 km (87 mi) | SE | earthquakes near Orange County |
Places and coordinates from the US Census Bureau Gazetteer (2024). Distances are from the epicentre.
Aftershocks so far
46 earthquakes have been recorded within 50 km since this one.
- 1.8 6km WNW of Castaic, CA
- 1.8 7km WSW of Valencia, CA
- 2.4 7km WSW of Valencia, CA
- 2.1 7km WSW of Valencia, CA
- 1.6 12km WNW of Malibu, CA
- 2.7 12km NE of Ojai, CA
- 1.7 6km WNW of Castaic, CA
- 1.6 3km ESE of Fillmore, CA
- 2.6 12km W of Malibu, CA
- 3.0 6km S of Ojai, CA
- 1.8 21km SSW of Frazier Park, CA
- 2.1 16km N of Santa Paula, CA
- 1.5 16km N of Santa Paula, CA
- 1.6 16km ENE of Ojai, CA
- 1.6 16km SW of Thousand Oaks, 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.