Earthquake · reviewed by a seismologist
M 1.8md
6km SW of San Ardo, CA
- When
- Magnitude
- M 1.8 (md)
- Depth
- 9.9 km below the surface
- Felt
- no reports yet
- Nearest
- Monterey County, 44 km NW
- Status
- Reviewed by a seismologist
USGS · last changed by USGS · we first saw it 1969 days ago
This was a minor earthquake. Quakes this small are rarely felt and do not cause damage.
How big was it?
This earthquake released about 16 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.
- Mineral, Virginia 2011 M 5.8 970,000× the energy of this one
- Magna, Utah 2020 M 5.7 680,000× the energy of this one
- Around the size people start to feel M 3.0 61× the energy of this one
- This earthquake M 1.8 about 16 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.
Where
Epicentre 35.9780, -120.9527. Map © OpenStreetMap contributors.
Nearby places
| Place | Distance | Direction | |
|---|---|---|---|
| Monterey County, CA | 44 km (27 mi) | SE of here | earthquakes near Monterey County |
| San Benito County, CA | 71 km (44 mi) | S of here | earthquakes near San Benito County |
| San Luis Obispo County, CA | 80 km (50 mi) | NW of here | earthquakes near San Luis Obispo County |
| Kings County, CA | 103 km (64 mi) | W of here | earthquakes near Kings County |
| Fresno County, CA | 145 km (90 mi) | SW of here | earthquakes near Fresno County |
| Santa Cruz County, CA | 149 km (92 mi) | SE of here | earthquakes near Santa Cruz County |
Places and coordinates from the US Census Bureau Gazetteer (2024). Distances are from the epicentre.
Aftershocks so far
55 earthquakes have been recorded within 50 km since this one.
- 1.8 25km NW of Parkfield, CA
- 1.9 23km NW of Parkfield, CA
- 1.8 27km NW of San Simeon, CA
- 1.7 22km NW of San Simeon, CA
- 1.6 5km NW of Parkfield, CA
- 2.4 19km NNW of San Simeon, CA
- 2.6 2km SSE of Parkfield, CA
- 2.1 13km NW of Parkfield, CA
- 1.9 23km NNE of San Ardo, CA
- 1.7 20km NW of Parkfield, CA
- 1.9 23km SE of Pinnacles, CA
- 2.3 3km SE of San Ardo, CA
- 2.8 9km WNW of Templeton, CA
- 2.3 20km SW of New Idria, CA
- 1.8 7km SW of San Ardo, 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.