QuakeIndex

Earthquake · reviewed by a seismologist

M 1.6ml

Earthquake near Fountain Valley, CA

No earthquake was likely felt in Fountain Valley in the 24 hours to 1:37 am PST (09:37 UTC). The last one was M 3.2, 23 km (14 mi) WNW, at 12:44 am PDT on 9 October 2026, estimated intensity II (weak) in town; 1,090 felt reports to USGS. Every earthquake near Fountain Valley

This page: a magnitude 1.6 earthquake was recorded in Fountain Valley, CA, at 4:30 am PDT on 29 June 2017 (11:30 UTC), 6.8 km deep.

USGS: 2km W of Fountain Valley, CA

in Fountain Valley, CA · 53 km (33 mi) SE of Los Angeles, CA

4:30 am PDT, Jun 29, 2017 · · 6.8 km deep · released about 6.8 lb of TNT

Every earthquake near Fountain Valley Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Orange County 18 kmLos Angeles County 61 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
4:30 am PDT on 29 June 2017 ()
Where
in Fountain Valley, CA · earthquakes near Fountain Valley
Magnitude
M 1.6 (ml)
Depth
6.8 km below the surface
Felt
no reports yet
Nearest
Orange County, 18 km ESE
Nearest mapped fault
Newport-Inglewood-Rose Canyon 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 3422 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 8 km (5 mi) from the epicentre. 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: Fountain Valley in town, intensity II · Huntington Beach 6 km, intensity II · Westminster 7 km, intensity II · Garden Grove 8 km, intensity II. Estimated for each town centre; each link is that town's own record.

How big was it?

This earthquake released about 6.8 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.

  1. Mineral, Virginia 2011 M 5.8 2,200,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 1,600,000× the energy of this one
  3. Around the size people start to feel M 3.0 140× the energy of this one
  4. This earthquake M 1.6 about 6.8 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 10 earthquakes of M5 or more within 50 km; the five largest:

  1. 6.4 The 1933 Long Beach, California Earthquake · 9 km SSW of this epicentre
  2. 5.9 The 1987 Whittier Narrows, California Earthquake · 41 km NNW of this epicentre
  3. 5.4 5km S of Chino Hills, CA · 33 km NE of this epicentre
  4. 5.3 7km W of Newport Beach, CA · 10 km SSW of this epicentre
  5. 5.2 8km ENE of Trabuco Canyon, CA · 43 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 33.7080, -117.9703. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection from the epicentre
Orange County, CA 18 km (11 mi) ESE earthquakes near Orange County
Los Angeles County, CA 61 km (38 mi) NNW earthquakes near Los Angeles County
Ventura County, CA 129 km (80 mi) NW earthquakes near Ventura County
San Diego County, CA 135 km (84 mi) SE earthquakes near San Diego County

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

Aftershocks so far

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

  1. 2.1 5km WNW of Willowbrook, CA
  2. 1.6 4km N of Gardena, CA
  3. 1.7 12km SSE of San Pedro, CA
  4. 1.6 11km S of San Pedro, CA
  5. 1.8 3km WSW of East Los Angeles, CA
  6. 1.7 5km NE of Yorba Linda, CA
  7. 1.9 5km SSE of Home Gardens, CA
  8. 2.4 4km SSW of Yorba Linda, CA
  9. 1.6 7km WSW of Huntington Beach, CA
  10. 2.1 4km SSW of Yorba Linda, CA
  11. 1.6 4km ESE of Placentia, CA
  12. 1.6 4km SSW of Yorba Linda, CA
  13. 2.4 4km SSW of Yorba Linda, CA
  14. 3.7 19km NE of Avalon, CA
  15. 1.5 1km NNW of Florence-Graham, 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.