QuakeIndex

Earthquake · reviewed by a seismologist

M 1.9ml

Earthquake near China Lake Acres, CA

No earthquake was likely felt in China Lake Acres in the 24 hours to 5:13 am PST (13:13 UTC). The last one was M 3.2, 37 km (23 mi) S, at 8:01 am PDT on 23 September 2026, estimated intensity II (weak) in town; 3 felt reports to USGS. Every earthquake near China Lake Acres

This page: a magnitude 1.9 earthquake was recorded 50 km (31 mi) north of China Lake Acres, CA, at 8:43 am PDT on 1 April 2018 (15:43 UTC), 1.7 km deep.

USGS: 10km ENE of Coso Junction, CA

8:43 am PDT, Apr 1, 2018 · · 1.7 km deep · released about 19 lb of TNT

Every earthquake near China Lake Acres Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Inyo County 67 kmTulare County 85 kmKern County 114 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
8:43 am PDT on 1 April 2018 ()
Where
50 km (31 mi) north of China Lake Acres, CA · earthquakes near China Lake Acres
Magnitude
M 1.9 (ml)
Depth
1.7 km below the surface
Felt
no reports yet
Nearest
Inyo County, 67 km NE
Nearest mapped fault
Southern Sierra Nevada 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, people at rest would likely notice it out to about 14 km (9 mi) from the epicentre. In China Lake Acres, 50 km away, the estimate is intensity I (not felt). 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 19 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 2.9 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 810,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 580,000× the energy of this one
  3. Around the size people start to feel M 3.0 51× the energy of this one
  4. This earthquake M 1.9 about 19 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 18 earthquakes of M5 or more within 50 km; the five largest:

  1. 6.3 The 1946 Walker Pass, California Earthquake · 43 km SSW of this epicentre
  2. 5.8 16km NNE of Ridgecrest, California · 40 km SSE of this epicentre
  3. 5.4 14km NW of Inyokern, CA · 41 km SSW of this epicentre
  4. 5.4 4km N of Inyokern, CA · 45 km S of this epicentre
  5. 5.4 17km N of Ridgecrest, California · 38 km SSE 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 36.0812, -117.8482. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection from the epicentre
Inyo County, CA 67 km (41 mi) NE earthquakes near Inyo County
Tulare County, CA 85 km (53 mi) WNW earthquakes near Tulare County
Kern County, CA 114 km (71 mi) SW earthquakes near Kern County

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

Aftershocks so far

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

  1. 2.0 13km WSW of Searles Valley, CA
  2. 1.6 16km NE of Little Lake, CA
  3. 1.7 30km E of Coso Junction, CA
  4. 1.6 37km ENE of Coso Junction, CA
  5. 1.8 29km ENE of Olancha, CA
  6. 1.6 9km NE of Coso Junction, CA
  7. 1.6 33km ENE of Coso Junction, CA
  8. 1.6 16km NE of Little Lake, CA
  9. 1.6 7km E of Coso Junction, CA
  10. 1.8 7km WNW of Little Lake, CA
  11. 1.6 8km ENE of Coso Junction, CA
  12. 1.6 11km S of Olancha, CA
  13. 1.5 30km NNW of Searles Valley, CA
  14. 1.6 16km E of Coso Junction, CA
  15. 1.6 7km SSW of Coso Junction, 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.