QuakeIndex

Earthquake · reviewed by a seismologist

M 1.7ml

Earthquake near Port Hueneme, CA

No earthquake was likely felt in Port Hueneme in the 24 hours to 12:50 am PST (08:50 UTC). The last one was M 3.8, 48 km (30 mi) NE, at 8:00 pm PDT on 29 September 2026, estimated intensity II (weak) in town; 199 felt reports to USGS. Every earthquake near Port Hueneme

This page: a magnitude 1.7 earthquake was recorded 6 km (3 mi) east-southeast of Port Hueneme, CA, at 8:04 am PDT on 3 April 2018 (15:04 UTC), 17 km deep.

USGS: 6km ESE of Port Hueneme, CA

9 km (6 mi) SE of Oxnard, CA · 68 km (42 mi) WNW of Los Angeles, CA

8:04 am PDT, Apr 3, 2018 · · 17 km deep · released about 11 lb of TNT

Every earthquake near Port Hueneme Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Ventura County 25 kmLos Angeles County 81 kmSanta Barbara County 94 km
Distance rings around the epicentre, with the nearest towns at their true direction and later quakes as coloured dots. Not a shaking map — see the USGS ShakeMap for that.
When
8:04 am PDT on 3 April 2018 ()
Where
6 km (3 mi) east-southeast of Port Hueneme, CA · earthquakes near Port Hueneme
Magnitude
M 1.7 (ml)
Depth
17 km below the surface
Felt
no reports yet
Nearest
Ventura County, 25 km N
Nearest mapped fault
Malibu Coast fault, 12 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 3030 days ago

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 Port Hueneme, 6 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: Oxnard, Channel Islands Beach, El Rio, Camarillo, Saticoy, Ventura.

How big was it?

This earthquake released about 11 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.

  1. Mineral, Virginia 2011 M 5.8 1,400,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 1,000,000× the energy of this one
  3. Around the size people start to feel M 3.0 89× the energy of this one
  4. This earthquake M 1.7 about 11 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 4,400 times the energy of this one.

Before 2016, the USGS record lists 11 earthquakes of M5 or more within 50 km; the five largest:

  1. 5.6 7km NNE of Simi Valley, California · 45 km ENE of this epicentre
  2. 5.5 30 km SW of Channel Islands Beach, California · 37 km WSW of this epicentre
  3. 5.5 The 1941 Santa Barbara, California Earthquake · 45 km WNW of this epicentre
  4. 5.3 The 1973 Point Mugu, California Earthquake · 19 km SSE of this epicentre
  5. 5.2 9 km SW of Channel Islands Beach, California · 16 km WSW 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 34.1378, -119.1363. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection from the epicentre
Ventura County, CA 25 km (15 mi) N earthquakes near Ventura County
Los Angeles County, CA 81 km (50 mi) E earthquakes near Los Angeles County
Santa Barbara County, CA 94 km (58 mi) WNW earthquakes near Santa Barbara County

Places and coordinates from the US Census Bureau Gazetteer (2024). Distances are from the epicentre.

Aftershocks so far

48 earthquakes have been recorded within 50 km since this one.

  1. 1.9 9km SSW of Malibu Beach, CA
  2. 1.5 25km S of Malibu, CA
  3. 2.9 22km SE of Santa Cruz Is. (E end), CA
  4. 2.2 15km SSW of Carpinteria, CA
  5. 1.6 3km ESE of Fillmore, CA
  6. 1.5 4km SW of Carpinteria, CA
  7. 2.1 31km NNW of Santa Barbara Is., CA
  8. 2.6 12km W of Malibu, CA
  9. 3.0 6km S of Ojai, CA
  10. 2.1 22km SSE of Santa Barbara, CA
  11. 2.1 16km N of Santa Paula, CA
  12. 1.5 16km N of Santa Paula, CA
  13. 1.6 16km ENE of Ojai, CA
  14. 1.6 16km SW of Thousand Oaks, CA
  15. 1.6 14km NE 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

QuakeIndex does not issue warnings. For earthquake early warning see ShakeAlert.