quarry blast · reviewed by a seismologist
M 1.7md
3km E of Aromas, CA
- When
- Magnitude
- M 1.7 (md)
- Depth
- -0.1 km below the surface
- Felt
- no reports yet
- Nearest
- Santa Clara County, 37 km N
- Status
- Reviewed by a seismologist
USGS · last changed by USGS · we first saw it 2151 days ago
This was a minor earthquake. Quakes this small are rarely felt and do not cause damage.
USGS catalogues this as quarry blast, not an earthquake.
How big was it?
This earthquake released about 10 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 2.7 would have released about 32 times as much.
- Mineral, Virginia 2011 M 5.8 1,500,000× the energy of this one
- Magna, Utah 2020 M 5.7 1,100,000× the energy of this one
- Around the size people start to feel M 3.0 95× the energy of this one
- This earthquake M 1.7 about 10 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 36.8935, -121.6108. Map © OpenStreetMap contributors.
Nearby places
| Place | Distance | Direction | |
|---|---|---|---|
| Santa Clara County, CA | 37 km (23 mi) | S of here | earthquakes near Santa Clara County |
| Santa Cruz County, CA | 38 km (23 mi) | ESE of here | earthquakes near Santa Cruz County |
| San Benito County, CA | 56 km (35 mi) | NW of here | earthquakes near San Benito County |
| Monterey County, CA | 77 km (48 mi) | NNW of here | earthquakes near Monterey County |
| Merced County, CA | 86 km (53 mi) | WSW of here | earthquakes near Merced County |
| Alameda County, CA | 88 km (55 mi) | SSE of here | earthquakes near Alameda County |
Places and coordinates from the US Census Bureau Gazetteer (2024). Distances are from the epicentre.
Aftershocks so far
45 earthquakes have been recorded within 50 km since this one.
- 1.9 13km S of Tres Pinos, CA
- 2.5 10km NW of Pinnacles, CA
- 1.7 10km SSW of Tres Pinos, CA
- 1.8 2km ENE of Aromas, CA
- 1.5 8km ESE of Prunedale, CA
- 3.5 10km ENE of Morgan Hill, CA
- 3.7 10km ENE of Morgan Hill, CA
- 1.6 16km SSE of Tres Pinos, CA
- 2.1 7km ENE of Chualar, CA
- 2.2 16km SE of Tres Pinos, CA
- 1.7 13km S of Tres Pinos, CA
- 1.5 9km SSW of Tres Pinos, CA
- 1.9 4km ENE of Tres Pinos, CA
- 1.6 11km SW of Ridgemark, CA
- 2.1 11km SW of Ridgemark, 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 4.7 on 2019-10-15 — it released about 35,000 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.