Earthquake · reviewed by a seismologist
M 1.8ml
21 km ENE of Herlong, California
Yes. A magnitude 1.8 earthquake was recorded 21 km ENE of Herlong, California, 71 km (44 mi) N of Reno, NV, at 7:21 pm PDT on 18 July 2023 (02:21 UTC), 13 km deep.
71 km (44 mi) N of Reno, NV
- When
- Magnitude
- M 1.8 (ml)
- Depth
- 13 km below the surface
- Felt
- no reports yet
- Nearest
- Washoe County, 64 km NNE
- Nearest mapped fault
- Dry Valley-Smoke Creek Ranch fault, 3 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 1029 days ago
Earthquake alerts for Janesville, CA
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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 4 km (2 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 15 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 2.8 would have released about 32 times as much.
- Mineral, Virginia 2011 M 5.8 1,000,000× the energy of this one
- Magna, Utah 2020 M 5.7 710,000× the energy of this one
- Around the size people start to feel M 3.0 63× the energy of this one
- This earthquake M 1.8 about 15 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 4.5 on 2016-08-04 — about 10,000 times the energy of this one.
Before 2016, the USGS record lists 2 earthquakes of M5 or more within 50 km:
- 5.6 6 km NNE of Doyle, California · 19 km SW of this epicentre
- 5.3 4 km S of Doyle, California · 29 km SW 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 40.1852, -119.8935. Map © OpenStreetMap contributors.
Nearby places
| Place | Distance | Direction from the epicentre | |
|---|---|---|---|
| Washoe County, NV | 64 km (40 mi) | NNE | earthquakes near Washoe County |
| Plumas County, CA | 82 km (51 mi) | WSW | earthquakes near Plumas County |
| Lassen County, CA | 85 km (53 mi) | NW | earthquakes near Lassen County |
| Sierra County, CA | 86 km (54 mi) | SW | earthquakes near Sierra County |
| Storey County, NV | 89 km (55 mi) | SSE | earthquakes near Storey County |
| Carson City, NV | 115 km (72 mi) | S | earthquakes near Carson City |
Places and coordinates from the US Census Bureau Gazetteer (2024). Distances are from the epicentre.
Aftershocks so far
52 earthquakes have been recorded within 50 km since this one.
- 2.3 20 km E of Honey Lake, CA
- 1.5 13 km N of Herlong, California
- 2.4 21 km E of Honey Lake, CA
- 2.9 22 km E of Honey Lake, CA
- 1.5 11 km N of Herlong, California
- 1.9 37 km NE of Herlong, California
- 1.5 12 km SW of Doyle, California
- 1.5 31 km NNW of Sutcliffe, Nevada
- 1.6 17 km NW of Sutcliffe, Nevada
- 2.0 14 km NNW of Sutcliffe, Nevada
- 1.6 22 km NNW of Sutcliffe, Nevada
- 1.8 16 km WSW of Doyle, California
- 2.6 31 km NNW of Sutcliffe, Nevada
- 2.5 32 km NNW of Sutcliffe, Nevada
- 1.7 37 km W of Empire, Nevada
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.