Earthquake · reviewed by a seismologist
M 1.7ml
Earthquake near Ventura, CA
No earthquake was likely felt in Ventura in the 24 hours to 4:18 am PST (12:18 UTC). The last one was M 3.8, 50 km (31 mi) ENE, at 8:00 pm PDT on 29 September 2026, estimated intensity II (weak) in town; 199 felt reports to USGS. Every earthquake near Ventura
This page: a magnitude 1.7 earthquake was recorded 13 km (8 mi) northeast of Ventura, CA, at 11:49 am PDT on 25 August 2023 (18:49 UTC), 12 km deep. 1 person has reported feeling it to USGS.
USGS: 9 km NNE of Ventura, CA
11 km (7 mi) NE of San Buenaventura (Ventura), CA · 80 km (50 mi) WNW of Los Angeles, CA
- When
- 11:49 am PDT on 25 August 2023 ()
- Where
- 13 km (8 mi) northeast of Ventura, CA · earthquakes near Ventura
- Magnitude
- M 1.7 (ml)
- Depth
- 12 km below the surface
- Felt
- 1 report · strongest reported intensity I
- Nearest
- Ventura County, 5 km E
- Nearest mapped fault
- Ventura fault, 8 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 1172 days ago
Earthquake alerts for Ventura, CA
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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. In Ventura, 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.
Earthquakes near other towns within 30 km: Saticoy, Santa Paula, Oak View, Ojai, El Rio, Mira Monte.
How big was it?
This earthquake released about 9.3 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 1,600,000× the energy of this one
- Magna, Utah 2020 M 5.7 1,100,000× the energy of this one
- Around the size people start to feel M 3.0 100× the energy of this one
- This earthquake M 1.7 about 9.3 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 5.1 on 2023-08-20 — about 130,000 times the energy of this one.
Before 2016, the USGS record lists 13 earthquakes of M5 or more within 50 km; the five largest:
- 5.6 7km NNE of Simi Valley, California · 45 km E of this epicentre
- 5.5 Southwest of Tejon Pass, California · 42 km NNE of this epicentre
- 5.5 30 km SW of Channel Islands Beach, California · 49 km SW of this epicentre
- 5.5 10 km NE of Toro Canyon, California · 33 km WNW of this epicentre
- 5.5 The 1941 Santa Barbara, California Earthquake · 35 km W 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 34.3517, -119.1833. Map © OpenStreetMap contributors.
Nearby places
| Place | Distance | Direction from the epicentre | |
|---|---|---|---|
| Ventura County, CA | 5 km (3 mi) | E | earthquakes near Ventura County |
| Santa Barbara County, CA | 81 km (50 mi) | WNW | earthquakes near Santa Barbara County |
| Los Angeles County, CA | 86 km (54 mi) | ESE | earthquakes near Los Angeles County |
| Kern County, CA | 118 km (73 mi) | NNE | earthquakes near Kern County |
| San Luis Obispo County, CA | 163 km (101 mi) | NW | earthquakes near San Luis Obispo County |
Places and coordinates from the US Census Bureau Gazetteer (2024). Distances are from the epicentre.
Aftershocks so far
55 earthquakes have been recorded within 50 km since this one.
- 1.6 11 km E of Carpinteria, CA
- 1.5 14 km N of Santa Paula, CA
- 1.5 13 km N of Santa Paula, CA
- 1.8 18 km S of Port Hueneme, CA
- 2.3 8 km WNW of Malibu, CA
- 1.6 12 km W of Ventura, CA
- 2.3 12 km WSW of Ventura, CA
- 1.6 12 km W of Ventura, CA
- 2.0 7 km NE of Carpinteria, CA
- 1.6 15 km ENE of Ojai, CA
- 1.6 6 km NNE of Santa Paula, CA
- 1.8 14 km W of Malibu, CA
- 1.8 6 km W of Simi Valley, CA
- 2.4 13 km SSE of Carpinteria, CA
- 2.2 8 km ESE of Ojai, 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.