Earthquake · reviewed by a seismologist
M 2.2md
18km W of Bridgeport, CA
Yes. A magnitude 2.2 earthquake was recorded 18km W of Bridgeport, CA, at 6:54 am PST on 4 March 2018 (14:54 UTC), 6.5 km deep. 2 people have reported feeling it to USGS.
- When
- Magnitude
- M 2.2 (md)
- Depth
- 6.5 km below the surface
- Felt
- 2 reports · strongest reported intensity II
- Nearest
- Alpine County, 52 km NW
- Nearest mapped fault
- Robinson Creek fault, 11 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 3173 days ago
Earthquake alerts for Topaz Ranch Estates, NV
Get a notification in this browser when USGS records an earthquake near Topaz Ranch Estates, NV. 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 18 km (11 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.
How big was it?
This earthquake released about 67 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 3.2 would have released about 32 times as much.
- Mineral, Virginia 2011 M 5.8 230,000× the energy of this one
- Magna, Utah 2020 M 5.7 160,000× the energy of this one
- Around the size people start to feel M 3.0 14× the energy of this one
- This earthquake M 2.2 about 67 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 5.6 on 2016-12-28 — about 110,000 times the energy of this one.
Before 2016, the USGS record lists 7 earthquakes of M5 or more within 50 km; the five largest:
- 5.8 3 km NE of Mono City, California · 35 km SE of this epicentre
- 5.2 23 km S of Walker, California · 8 km NW of this epicentre
- 5.1 23 km E of Bridgeport, California · 41 km E of this epicentre
- 5.1 19 km W of Bridgeport, California · 4 km SSW of this epicentre
- 5.0 Near Coleville, California · 37 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 38.2538, -119.4342. Map © OpenStreetMap contributors.
Nearby places
| Place | Distance | Direction from the epicentre | |
|---|---|---|---|
| Alpine County, CA | 52 km (32 mi) | NW | earthquakes near Alpine County |
| Tuolumne County, CA | 53 km (33 mi) | WSW | earthquakes near Tuolumne County |
| Mono County, CA | 62 km (38 mi) | SE | earthquakes near Mono County |
| Douglas County, NV | 74 km (46 mi) | NNW | earthquakes near Douglas County |
| Mariposa County, CA | 86 km (54 mi) | SSW | earthquakes near Mariposa County |
| Lyon County, NV | 88 km (55 mi) | NNE | earthquakes near Lyon County |
Places and coordinates from the US Census Bureau Gazetteer (2024). Distances are from the epicentre.
Aftershocks so far
54 earthquakes have been recorded within 50 km since this one.
- 1.6 28 km WSW of Hawthorne, Nevada
- 2.1 3km W of Bridgeport, CA
- 1.5 19 km E of Walker, California
- 1.6 17km ENE of Lee Vining, CA
- 1.6 28 km SW of Hawthorne, Nevada
- 1.5 30 km SW of Hawthorne, Nevada
- 2.4 28 km WSW of Hawthorne, Nevada
- 1.6 17km S of Bridgeport, CA
- 2.2 6km WNW of Bridgeport, CA
- 2.5 6km WNW of Bridgeport, CA
- 1.7 19 km E of Walker, California
- 2.0 28 km WSW of Hawthorne, Nevada
- 1.5 California-Nevada border region
- 1.5 12 km SSW of Bridgeport, California
- 1.9 23km WNW of Bridgeport, 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.