QuakeIndex

Earthquake · reviewed by a seismologist

M 1.8ml

California-Nevada border region

Yes. A magnitude 1.8 earthquake was recorded in the California-Nevada border region, at 12:50 am PDT on 29 September 2017 (07:50 UTC), 9.6 km deep.

· 9.6 km deep · released about 15 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Mono County 45 kmMineral County 68 kmAlpine County 71 kmTuolumne County 79 kmDouglas County 83 kmLyon County 84 kmMariposa County 104 kmCarson City 112 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
Magnitude
M 1.8 (ml)
Depth
9.6 km below the surface
Felt
no reports yet
Nearest
Mono County, 45 km SSE
Nearest mapped fault
Robinson Creek fault, 17 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 3056 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 10 km (6 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.

How big was it?

This earthquake released about 15 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 2.8 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 1,000,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 710,000× the energy of this one
  3. Around the size people start to feel M 3.0 63× the energy of this one
  4. This earthquake M 1.8 about 15 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 in our catalogue was M 5.6 on 2016-12-28 — about 500,000 times the energy of this one.

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 38.2672, -119.1226. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection from the epicentre
Mono County, CA 45 km (28 mi) SSE earthquakes near Mono County
Mineral County, NV 68 km (42 mi) ENE earthquakes near Mineral County
Alpine County, CA 71 km (44 mi) NW earthquakes near Alpine County
Tuolumne County, CA 79 km (49 mi) WSW earthquakes near Tuolumne County
Douglas County, NV 83 km (51 mi) NNW earthquakes near Douglas County
Lyon County, NV 84 km (52 mi) N earthquakes near Lyon 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. 2.6 29 km ENE of Lee Vining, California
  2. 1.5 30 km ENE of Bridgeport, California
  3. 1.6 29 km WSW of Hawthorne, Nevada
  4. 1.5 24 km ENE of Mono City, California
  5. 2.6 30 km SSW of Hawthorne, Nevada
  6. 1.5 31 km SSW of Hawthorne, Nevada
  7. 1.6 31 km SSW of Hawthorne, Nevada
  8. 1.9 31 km SSW of Hawthorne, Nevada
  9. 1.6 32 km SSW of Hawthorne, Nevada
  10. 2.1 30 km SSW of Hawthorne, Nevada
  11. 1.5 31 km SSW of Hawthorne, Nevada
  12. 1.5 30 km SSW of Hawthorne, Nevada
  13. 1.9 30 km SSW of Hawthorne, Nevada
  14. 1.9 29 km SSW of Hawthorne, Nevada
  15. 2.3 31 km SSW of Hawthorne, Nevada

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.