Earthquake · reviewed by a seismologist
M 2.3md
13km NNE of Morgan Hill, CA
- When
- Magnitude
- M 2.3 (md)
- Depth
- 5.0 km below the surface
- Felt
- no reports yet
- Nearest
- Santa Clara County, 6 km WSW
- Status
- Reviewed by a seismologist
USGS · last changed by USGS · we first saw it 2672 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 72 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 3.3 would have released about 32 times as much.
- Mineral, Virginia 2011 M 5.8 210,000× the energy of this one
- Magna, Utah 2020 M 5.7 150,000× the energy of this one
- Around the size people start to feel M 3.0 13× the energy of this one
- This earthquake M 2.3 about 72 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 37.2422, -121.6260. Map © OpenStreetMap contributors.
Nearby places
| Place | Distance | Direction | |
|---|---|---|---|
| Santa Clara County, CA | 6 km (4 mi) | ENE of here | earthquakes near Santa Clara County |
| Santa Cruz County, CA | 42 km (26 mi) | NE of here | earthquakes near Santa Cruz County |
| Alameda County, CA | 52 km (32 mi) | SSE of here | earthquakes near Alameda County |
| Stanislaus County, CA | 66 km (41 mi) | WSW of here | earthquakes near Stanislaus County |
| San Mateo County, CA | 69 km (43 mi) | ESE of here | earthquakes near San Mateo County |
| Merced County, CA | 80 km (50 mi) | W of here | earthquakes near Merced County |
Places and coordinates from the US Census Bureau Gazetteer (2024). Distances are from the epicentre.
Aftershocks so far
53 earthquakes have been recorded within 50 km since this one.
- 1.8 5km NNE of Alum Rock, CA
- 1.5 16km N of Morgan Hill, CA
- 1.7 11km NE of Milpitas, CA
- 2.3 9km NE of Hollister, CA
- 2.0 3km SW of San Juan Bautista, CA
- 1.5 5km SSW of Gilroy, CA
- 1.7 5km NNW of Aromas, CA
- 1.9 12km ENE of Milpitas, CA
- 1.6 7km WSW of Gilroy, CA
- 2.5 8km NE of Alum Rock, CA
- 1.6 9km NE of Milpitas, CA
- 2.0 2km WSW of San Juan Bautista, CA
- 1.5 3km E of Aromas, CA
- 2.5 4km SW of Saratoga, CA
- 2.0 4km SW of Saratoga, 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.
For this area
The largest earthquake within 50 km in our catalogue was M 4.1 on 2017-10-10 — it released about 580 times the energy of this one.
From the QuakeIndex catalogue, built from the USGS FDSN event service.
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.