Earthquake · reviewed by a seismologist
M 1.1ml
8 km NE of Coso Junction, CA
- When
- Magnitude
- M 1.1 (ml)
- Depth
- 3.8 km below the surface
- Felt
- no reports yet
- Nearest
- Inyo County, 68 km NE
- Nearest mapped fault
- Southern Sierra Nevada fault, 9 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 3 days ago
A magnitude 1.1 earthquake was recorded 8 km NE of Coso Junction, CA at 01:04 UTC on 2026-09-30. This was a minor earthquake. Quakes this small are rarely felt and do not cause damage.
How big was it?
This earthquake released about 1.6 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 2.1 would have released about 32 times as much.
- Mineral, Virginia 2011 M 5.8 9,400,000× the energy of this one
- Magna, Utah 2020 M 5.7 6,700,000× the energy of this one
- Around the size people start to feel M 3.0 600× the energy of this one
- This earthquake M 1.1 about 1.6 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
The largest earthquake within 50 km since 2016 was M 7.1 on 2019-07-06 — about 840,000,000 times the energy of this one.
Before 2016, the USGS record lists 18 earthquakes of M5 or more within 50 km; the five largest:
- 6.3 The 1946 Walker Pass, California Earthquake · 44 km S of this epicentre
- 5.8 16km NNE of Ridgecrest, California · 44 km SSE of this epicentre
- 5.4 14km NW of Inyokern, CA · 42 km S of this epicentre
- 5.4 4km N of Inyokern, CA · 47 km S of this epicentre
- 5.4 17km N of Ridgecrest, California · 41 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 36.0962, -117.8928. Map © OpenStreetMap contributors.
Nearby places
| Place | Distance | Direction from the epicentre | |
|---|---|---|---|
| Inyo County, CA | 68 km (42 mi) | NE | earthquakes near Inyo County |
| Tulare County, CA | 81 km (50 mi) | W | earthquakes near Tulare County |
| Kern County, CA | 112 km (70 mi) | SW | earthquakes near Kern County |
Places and coordinates from the US Census Bureau Gazetteer (2024). Distances are from the epicentre.
Aftershocks so far
9 earthquakes have been recorded within 50 km since this one.
- 1.1 21 km N of Searles Valley, CA
- 2.1 21 km N of Searles Valley, CA
- 0.6 20 km ESE of Little Lake, CA
- 0.7 22 km ESE of Little Lake, CA
- 0.7 20 km WNW of Searles Valley, CA
- 0.6 21 km E of Little Lake, CA
- 0.8 7 km NE of Coso Junction, CA
- 0.9 12 km NNE of Coso Junction, CA
- 0.8 22 km ESE of Little Lake, 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.
Revisions
USGS refines a solution as more stations report. Every change we have seen is listed here.
| What changed | From | To | When |
|---|---|---|---|
| review status | automatic | reviewed | |
| location | 8 km NNE of Coso Junction, CA | 8 km NE of Coso Junction, CA | |
| longitude | -117.9 | -117.89 | |
| latitude | 36.1 | 36.1 | |
| depth | 3.95 | 3.75 | |
| magnitude | 1.16 | 1.15 | |
| location | 13 km S of Olancha, CA | 8 km NNE of Coso Junction, CA | |
| longitude | -117.99 | -117.9 | |
| latitude | 36.16 | 36.1 | |
| depth | 6.43 | 3.95 | |
| magnitude | 1.42 | 1.16 |
On USGS
- The official USGS event page — the source of record for every value above
- Did you feel it? Report it to USGS — reports go to USGS, not to us
- ShakeMap for this event, when USGS has produced one
QuakeIndex does not issue warnings. For earthquake early warning see ShakeAlert.