Earthquake · automatic estimate, may change
M 1.3md
Earthquake near Mammoth Lakes, CA
USGS: 18 km SSE of Mammoth Lakes, CA
- When
- 8:39 pm PDT on 29 September 2026 ()
- Where
- 18 km (11 mi) SSE of Mammoth Lakes, CA · earthquakes near Mammoth Lakes
- Magnitude
- M 1.3 (md)
- Depth
- 2.9 km below the surface
- Felt
- no reports yet
- Nearest
- Mono County, 46 km N
- Nearest mapped fault
- Hilton Creek fault, 9 km from its surface trace — near is not the same as on
- Status
- Automatic — a machine’s first estimate, which may change
USGS · last changed by USGS · we first saw it 3 days ago
A magnitude 1.3 earthquake was recorded 18 km (11 mi) SSE of Mammoth Lakes, CA, at 8:39 pm PDT on 29 September 2026 (03:39 UTC). This was a minor earthquake. Quakes this small are rarely felt and do not cause damage.
How big was it?
This earthquake released about 2.9 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 2.3 would have released about 32 times as much.
- Mineral, Virginia 2011 M 5.8 5,200,000× the energy of this one
- Magna, Utah 2020 M 5.7 3,700,000× the energy of this one
- Around the size people start to feel M 3.0 330× the energy of this one
- This earthquake M 1.3 about 2.9 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 4.4 on 2020-02-01 — about 43,000 times the energy of this one.
Before 2016, the USGS record lists 38 earthquakes of M5 or more within 50 km; the five largest:
- 6.4 The 1986 Chalfant Valley, California Earthquake · 38 km E of this epicentre
- 6.2 9 km SW of Aspen Springs, California · 6 km E of this epicentre
- 6.1 11 km WNW of Aspen Springs, California · 10 km NNE of this epicentre
- 6.1 8 km W of Aspen Springs, California · 8 km NE of this epicentre
- 6.1 4 km NNW of Round Valley, California · 24 km ESE 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 37.5030, -118.8735. Map © OpenStreetMap contributors.
Nearby places
| Place | Distance | Direction from the epicentre | |
|---|---|---|---|
| Mono County, CA | 46 km (29 mi) | N | earthquakes near Mono County |
| Madera County, CA | 84 km (52 mi) | WSW | earthquakes near Madera County |
| Mariposa County, CA | 92 km (57 mi) | W | earthquakes near Mariposa County |
| Fresno County, CA | 108 km (67 mi) | SW | earthquakes near Fresno County |
| Tuolumne County, CA | 112 km (70 mi) | WNW | earthquakes near Tuolumne County |
| Esmeralda County, NV | 114 km (71 mi) | ENE | earthquakes near Esmeralda County |
Places and coordinates from the US Census Bureau Gazetteer (2024). Distances are from the epicentre.
Aftershocks so far
2 earthquakes have been recorded within 50 km since this one.
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
- 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.