Earthquake · reviewed by a seismologist
M 1.7md
Earthquake near Day Valley, CA
No earthquake was likely felt in Day Valley in the 24 hours to 6:51 pm PST (02:51 UTC). The last one was M 1.8, 10 km (6 mi) NNW, at 10:49 pm PDT on 29 October 2026, estimated intensity II (weak) in town. Every earthquake near Day Valley
This page: a magnitude 1.7 earthquake was recorded in Day Valley, CA, at 5:17 pm PDT on 11 July 2024 (00:17 UTC), 12 km deep.
USGS: 0 km SW of Day Valley, CA
30 km (18 mi) S of San Jose, CA · 15 km (9 mi) NW of Watsonville, CA
- When
- 5:17 pm PDT on 11 July 2024 ()
- Where
- in Day Valley, CA · earthquakes near Day Valley
- Magnitude
- M 1.7 (md)
- Depth
- 12 km below the surface
- Felt
- no reports yet
- Nearest
- Santa Cruz County, 13 km W
- Nearest mapped fault
- Zayante-Vergeles fault, 1 km from its surface trace — near is not the same as on
- Status
- Reviewed by a seismologist
USGS · last changed by USGS · we first saw it 852 days ago
Earthquake alerts for Day Valley, CA
Get a notification in this browser when USGS records an earthquake near Day Valley, CA. No account or email needed.
Alerts are on for .
Not a warning. An alert comes after USGS publishes a quake, usually minutes after the shaking. For early warning use ShakeAlert, through your phone's Wireless Emergency Alerts or the MyShake app.
This was a minor earthquake. Quakes this small are rarely felt and do not cause damage.
At this magnitude and depth, people at rest would likely notice it out to about 1 km (1 mi) from the epicentre. Estimated from magnitude, depth and distance with the intensity equation USGS Did You Feel It? uses; felt reports, where there are any, are the measurement.
Earthquakes near other towns within 30 km: Aptos, Corralitos, Rio Del Mar, Seacliff, Aptos Hills-Larkin Valley, Soquel.
How big was it?
This earthquake released about 11 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 1,400,000× the energy of this one
- Magna, Utah 2020 M 5.7 1,000,000× the energy of this one
- Around the size people start to feel M 3.0 89× the energy of this one
- This earthquake M 1.7 about 11 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 5.1 on 2022-10-25 — about 110,000 times the energy of this one.
Before 2016, the USGS record lists 31 earthquakes of M5 or more within 50 km; the five largest:
- 6.9 The 1989 Loma Prieta, California Earthquake · 1 km WNW of this epicentre
- 6.5 Near Morgan Hill, California · 22 km ENE of this epicentre
- 6.3 22 km S of Davenport, California · 39 km SW of this epicentre
- 6.3 16 km SW of Davenport, California · 44 km WSW of this epicentre
- 6.2 Near San Jose, California · 30 km N 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 37.0328, -121.8650. Map © OpenStreetMap contributors.
Nearby places
| Place | Distance | Direction from the epicentre | |
|---|---|---|---|
| Santa Cruz County, CA | 13 km (8 mi) | W | earthquakes near Santa Cruz County |
| Santa Clara County, CA | 26 km (16 mi) | NE | earthquakes near Santa Clara County |
| San Mateo County, CA | 62 km (38 mi) | NW | earthquakes near San Mateo County |
| Alameda County, CA | 68 km (43 mi) | N | earthquakes near Alameda County |
| San Benito County, CA | 84 km (52 mi) | SE | earthquakes near San Benito County |
| Stanislaus County, CA | 96 km (60 mi) | NE | earthquakes near Stanislaus 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 7 km WSW of Gilroy, CA
- 2.7 7 km WSW of Gilroy, CA
- 1.6 1 km NE of Aromas, CA
- 1.5 7 km SE of Prunedale, CA
- 1.6 6 km SSW of Loyola, CA
- 2.1 3 km of Aromas, CA
- 1.6 3 km N of Aromas, CA
- 1.7 2 km N of Aromas, CA
- 4.2 3 km of Aromas, CA
- 1.7 2 km ESE of Aromas, CA
- 2.7 3 km W of Ridgemark, CA
- 1.9 5 km of Hollister, CA
- 1.6 9 km E of Alum Rock, CA
- 3.4 8 km ENE of Alum Rock, CA
- 2.0 10 km ENE of Gilroy, 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.