Earthquake · reviewed by a seismologist
M 2.8md
Earthquake near Loyola, CA
No earthquake was likely felt in Loyola in the 24 hours to 11:54 am PST (19:54 UTC). The last one was M 2.0, 5 km (3 mi) SSE, at 9:23 am PST on 10 November 2026, estimated intensity II (weak) in town; 4 felt reports to USGS. Every earthquake near Loyola
This page: a magnitude 2.8 earthquake was recorded 7 km (4 mi) south-southwest of Loyola, CA, at 11:14 am PDT on 11 June 2018 (18:14 UTC), 10 km deep. 312 people have reported feeling it to USGS.
USGS: 6km SSW of Loyola, CA
29 km (18 mi) W of San Jose, CA · 8 km (5 mi) WSW of Cupertino, CA
- When
- 11:14 am PDT on 11 June 2018 ()
- Where
- 7 km (4 mi) south-southwest of Loyola, CA · earthquakes near Loyola
- Magnitude
- M 2.8 (md)
- Depth
- 10 km below the surface
- Felt
- 312 reports · strongest reported intensity IV
- Nearest
- San Mateo County, 24 km WNW
- Nearest mapped fault
- San Andreas fault, under 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 3070 days ago
Earthquake alerts for Loyola, CA
Get a notification in this browser when USGS records an earthquake near Loyola, 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 small earthquake. Shaking like this is often felt indoors nearby and very rarely causes damage.
At this magnitude and depth, people at rest would likely notice it out to about 25 km (16 mi) from the epicentre. In Loyola, 7 km away, the estimate is intensity III (weak). 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.
Likely felt in: Los Altos 10 km, intensity III · Cupertino 10 km, intensity III · Mountain View 11 km, intensity III · Saratoga 11 km, intensity III · Sunnyvale 12 km, intensity II · Palo Alto 16 km, intensity II · Los Gatos 17 km, intensity II · Campbell 17 km, intensity II. Estimated for each town centre; each link is that town's own record.
How big was it?
This earthquake released about 480 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 3.8 would have released about 32 times as much.
- Mineral, Virginia 2011 M 5.8 32,000× the energy of this one
- Magna, Utah 2020 M 5.7 22,000× the energy of this one
- Around the size people start to feel M 3.0 2× the energy of this one
- This earthquake M 2.8 about 480 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 4.1 on 2017-10-10 — about 86 times the energy of this one.
Before 2016, the USGS record lists 19 earthquakes of M5 or more within 50 km; the five largest:
- 6.9 The 1989 Loma Prieta, California Earthquake · 37 km SE of this epicentre
- 6.5 Near Morgan Hill, California · 49 km ESE of this epicentre
- 6.3 16 km SW of Davenport, California · 46 km SSW of this epicentre
- 6.2 Near San Jose, California · 30 km E of this epicentre
- 6.2 The 1984 Morgan Hill, California Earthquake · 41 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 37.3005, -122.1377. Map © OpenStreetMap contributors.
Nearby places
| Place | Distance | Direction from the epicentre | |
|---|---|---|---|
| San Mateo County, CA | 24 km (15 mi) | WNW | earthquakes near San Mateo County |
| Santa Cruz County, CA | 34 km (21 mi) | SSE | earthquakes near Santa Cruz County |
| Santa Clara County, CA | 41 km (25 mi) | ESE | earthquakes near Santa Clara County |
| Alameda County, CA | 43 km (27 mi) | NNE | earthquakes near Alameda County |
| Contra Costa County, CA | 71 km (44 mi) | NNE | earthquakes near Contra Costa County |
| San Francisco County, CA | 92 km (57 mi) | WNW | earthquakes near San Francisco County |
Places and coordinates from the US Census Bureau Gazetteer (2024). Distances are from the epicentre.
Aftershocks so far
46 earthquakes have been recorded within 50 km since this one.
- 1.9 4km S of Loyola, CA
- 1.9 10km ENE of Milpitas, CA
- 2.3 16km SSE of Livermore, CA
- 1.9 18km SSE of Livermore, CA
- 1.9 2km N of San Leandro, CA
- 1.7 21km E of Alum Rock, CA
- 1.8 2km E of San Leandro, CA
- 1.8 5km S of Alameda, CA
- 1.8 11km ESE of Sunol, CA
- 2.0 20km E of Alum Rock, CA
- 2.0 4km ESE of Union City, CA
- 1.7 8km NNE of Milpitas, CA
- 1.6 14km E of Seven Trees, CA
- 1.8 9km NNE of Alum Rock, CA
- 1.9 10km ESE of Sunol, 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.