QuakeIndex

Earthquake · reviewed by a seismologist

M 2.1ml

Earthquake near Port Hueneme, CA

No earthquake was likely felt in Port Hueneme in the 24 hours to 10:12 am PST (18:12 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 2.1 earthquake was recorded 47 km (29 mi) south of Port Hueneme, CA, at 10:14 am PDT on 13 October 2018 (17:14 UTC), 14 km deep.

USGS: 31km NNW of Santa Barbara Is., CA

79 km (49 mi) WSW of Los Angeles, CA · 53 km (33 mi) S of Oxnard, CA

10:14 am PDT, Oct 13, 2018 · · 14 km deep · released about 49 lb of TNT

Every earthquake near Port Hueneme Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Ventura County 71 kmLos Angeles County 101 kmSanta Barbara County 119 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
10:14 am PDT on 13 October 2018 ()
Where
47 km (29 mi) south of Port Hueneme, CA · earthquakes near Port Hueneme
Magnitude
M 2.1 (ml)
Depth
14 km below the surface
Felt
no reports yet
Nearest
Ventura County, 71 km N
Nearest mapped fault
Santa Cruz fault, 5 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

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 Port Hueneme, 47 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.

How big was it?

This earthquake released about 49 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 3.1 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 310,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 220,000× the energy of this one
  3. Around the size people start to feel M 3.0 19× the energy of this one
  4. This earthquake M 2.1 about 49 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

No earthquake of M4 or more has been recorded within 50 km since our catalogue begins in 2016.

Before 2016, the USGS record lists 5 earthquakes of M5 or more within 50 km:

  1. 5.5 30 km SW of Channel Islands Beach, California · 42 km NW of this epicentre
  2. 5.5 11km NNW of Santa Barbara Is., CA · 20 km SSE of this epicentre
  3. 5.3 The 1973 Point Mugu, California Earthquake · 31 km NNE of this epicentre
  4. 5.2 9 km SW of Channel Islands Beach, California · 43 km NNW of this epicentre
  5. 5.1 9km SSE of Santa Cruz Is. (E end), CA · 37 km NW 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 33.7262, -119.1930. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection from the epicentre
Ventura County, CA 71 km (44 mi) N earthquakes near Ventura County
Los Angeles County, CA 101 km (62 mi) ENE earthquakes near Los Angeles County
Santa Barbara County, CA 119 km (74 mi) NW earthquakes near Santa Barbara 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. 2.6 21km SE of Santa Cruz Is. (E end), CA
  2. 2.7 21km S of Port Hueneme, CA
  3. 1.9 6km W of Malibu, CA
  4. 1.6 7km W of Malibu, CA
  5. 1.7 9km WNW of Malibu, CA
  6. 1.5 10km NW of Malibu, CA
  7. 2.4 22km SE of Santa Cruz Is. (E end), CA
  8. 2.0 28km SSW of Port Hueneme, CA
  9. 2.1 10km SW of Westlake Village, CA
  10. 1.6 4km WNW of Port Hueneme, CA
  11. 2.6 20km SE of Santa Cruz Is. (E end), CA
  12. 2.0 30km S of Malibu, CA
  13. 3.1 23km SE of Santa Cruz Is. (E end), CA
  14. 2.2 12km SW of Port Hueneme, CA
  15. 2.4 37km S of Port Hueneme, 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.