Earthquake · automatic estimate, may change
M 1.3md
Earthquake near Mammoth Lakes, CA
USGS: 17 km SW of Toms Place, CA
- When
- 6:50 am PDT on 29 September 2026 ()
- Where
- 24 km (15 mi) SSE of Mammoth Lakes, CA · earthquakes near Mammoth Lakes
- Magnitude
- M 1.3 (md)
- Depth
- 1.8 km below the surface
- Felt
- no reports yet
- Nearest
- Mono County, 50 km N
- Nearest mapped fault
- Hilton Creek fault, 8 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 24 km (15 mi) SSE of Mammoth Lakes, CA, at 6:50 am PDT on 29 September 2026 (13:50 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 2.5 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 6,000,000× the energy of this one
- Magna, Utah 2020 M 5.7 4,300,000× the energy of this one
- Around the size people start to feel M 3.0 380× the energy of this one
- This earthquake M 1.3 about 2.5 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 4.8 on 2016-02-16 — about 170,000 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 · 35 km ENE of this epicentre
- 6.2 9 km SW of Aspen Springs, California · 5 km NNE of this epicentre
- 6.1 11 km WNW of Aspen Springs, California · 14 km N of this epicentre
- 6.1 8 km W of Aspen Springs, California · 10 km NNE of this epicentre
- 6.1 4 km NNW of Round Valley, California · 20 km E 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 37.4643, -118.8340. Map © OpenStreetMap contributors.
Nearby places
| Place | Distance | Direction from the epicentre | |
|---|---|---|---|
| Mono County, CA | 50 km (31 mi) | N | earthquakes near Mono County |
| Madera County, CA | 86 km (53 mi) | WSW | earthquakes near Madera County |
| Mariposa County, CA | 96 km (60 mi) | W | earthquakes near Mariposa County |
| Fresno County, CA | 107 km (66 mi) | SW | earthquakes near Fresno County |
| Esmeralda County, NV | 111 km (69 mi) | ENE | earthquakes near Esmeralda County |
| Tuolumne County, CA | 117 km (73 mi) | WNW | earthquakes near Tuolumne County |
Places and coordinates from the US Census Bureau Gazetteer (2024). Distances are from the epicentre.
Aftershocks so far
4 earthquakes have been recorded within 50 km since this one.
- 2.0 5 km NW of Dixon Lane-Meadow Creek, CA
- 1.9 17 km SW of Toms Place, CA
- 1.3 18 km SSE of Mammoth Lakes, CA
- 1.1 18 km SW of Toms Place, 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
- 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.