QuakeIndex

Earthquake · reviewed by a seismologist

M 1.5ml

Earthquake near Los Angeles, CA

No earthquake was likely felt in Los Angeles in the 24 hours to 1:42 am PST (09:42 UTC). The last one was M 3.2, 30 km (19 mi) S, at 12:44 am PDT on 9 October 2026, estimated intensity II (weak) in town; 1,090 felt reports to USGS. Every earthquake near Los Angeles

This page: a magnitude 1.5 earthquake was recorded 6 km (3 mi) northeast of Los Angeles, CA, at 4:08 am PDT on 19 September 2017 (11:08 UTC), 9.4 km deep.

USGS: 4km S of Highland Park, CA

21 km (13 mi) ENE of Los Angeles, CA · 6 km (3 mi) W of Alhambra, CA

4:08 am PDT, Sep 19, 2017 · · 9.4 km deep · released about 5.6 lb of TNT

Every earthquake near Los Angeles Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Los Angeles County 14 kmOrange County 60 kmVentura County 91 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
4:08 am PDT on 19 September 2017 ()
Where
6 km (3 mi) northeast of Los Angeles, CA · earthquakes near Los Angeles
Magnitude
M 1.5 (ml)
Depth
9.4 km below the surface
Felt
no reports yet
Nearest
Los Angeles County, 14 km NNW
Nearest mapped fault
Hollywood fault, 3 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 3303 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 4 km (2 mi) from the epicentre. In Los Angeles, 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: South Pasadena, Alhambra, East Los Angeles, Monterey Park, Glendale, Pasadena.

How big was it?

This earthquake released about 5.6 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 2.5 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 2,700,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 1,900,000× the energy of this one
  3. Around the size people start to feel M 3.0 170× the energy of this one
  4. This earthquake M 1.5 about 5.6 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 22 earthquakes of M5 or more within 50 km; the five largest:

  1. 6.7 Northridge, California, earthquake · 34 km WNW of this epicentre
  2. 6.6 1971 San Fernando Earthquake, California · 40 km NNW of this epicentre
  3. 5.9 The 1987 Whittier Narrows, California Earthquake · 11 km ESE of this epicentre
  4. 5.9 1km ENE of Granada Hills, California · 34 km NW of this epicentre
  5. 5.8 10km SSW of Agua Dulce, CA · 40 km NNW 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 34.0852, -118.1973. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection from the epicentre
Los Angeles County, CA 14 km (9 mi) NNW earthquakes near Los Angeles County
Orange County, CA 60 km (37 mi) SE earthquakes near Orange County
Ventura County, CA 91 km (57 mi) WNW earthquakes near Ventura County

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

Aftershocks so far

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

  1. 1.6 1km E of Yorba Linda, CA
  2. 1.7 4km WNW of San Fernando, CA
  3. 2.0 1km WSW of Manhattan Beach, CA
  4. 2.3 1km WSW of Manhattan Beach, CA
  5. 1.9 2km WSW of Manhattan Beach, CA
  6. 1.8 2km WSW of Manhattan Beach, CA
  7. 2.3 1km WSW of Manhattan Beach, CA
  8. 1.6 1km SSE of Silver Lake, CA
  9. 2.2 0km ESE of Silver Lake, CA
  10. 1.6 12km SSW of Agua Dulce, CA
  11. 2.9 1km SE of Silver Lake, CA
  12. 2.4 12km SSW of Agua Dulce, CA
  13. 1.7 4km W of Pomona, CA
  14. 1.6 2km NNE of Granada Hills, CA
  15. 2.1 2km WSW of Hermosa Beach, 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.