Earthquake near Yreka, CA

USGS: 22km ESE of Hornbrook, CA

5:58 am PDT, Jul 18, 2018 · 2018-07-18 12:58 UTC · 12 km deep · released about 13 lb of TNT

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Distance rings around the epicentre, with the nearest towns at their true direction and later quakes as coloured dots. Not a shaking map — see the USGS ShakeMap for that.

When: 5:58 am PDT on 18 July 2018 (2018-07-18 12:58 UTC)
Where: 30 km (19 mi) ENE of Yreka, CA · earthquakes near Yreka
Magnitude: M 1.8 (md)
Depth: 12 km below the surface
Felt: no reports yet
Nearest: Siskiyou County, 35 km SSW
Nearest mapped fault: Cedar Mountain fault system, 13 km from its surface trace — near is not the same as on
Status: Reviewed by a seismologist

USGS · last changed by USGS 2992 days ago · we first saw it 2992 days ago

A magnitude 1.8 earthquake was recorded 30 km (19 mi) ENE of Yreka, CA, at 5:58 am PDT on 18 July 2018 (12:58 UTC). This was a minor earthquake. Quakes this small are rarely felt and do not cause damage.

Earthquakes near other towns within 30 km: Montague.

How big was it?

This earthquake released about 13 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 1,200,000× the energy of this one
Magna, Utah 2020 M 5.7 840,000× the energy of this one
Around the size people start to feel M 3.0 75× the energy of this one
This earthquake M 1.8 about 13 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

No earthquake of M4 or more has been recorded within 50 km since our catalogue begins in 2016.

Before 2016, the USGS record since 1900 lists no earthquake of M5 or more within 50 km.

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

Map loads when it scrolls into view

Epicentre 41.8520, -122.3055. Map © OpenStreetMap contributors.

Nearby places

Place	Distance	Direction from the epicentre
Siskiyou County, CA	35 km (22 mi)	SSW	earthquakes near Siskiyou County
Jackson County, OR	69 km (43 mi)	NNW	earthquakes near Jackson County
Klamath County, OR	107 km (67 mi)	NNE	earthquakes near Klamath County
Josephine County, OR	120 km (75 mi)	WNW	earthquakes near Josephine County

Places and coordinates from the US Census Bureau Gazetteer (2024). Distances are from the epicentre.

Aftershocks so far

43 earthquakes have been recorded within 50 km since this one.

1.8 18 km E of Hornbrook, California 20:00 UTC
1.9 8 km E of Ashland, Oregon 20:47 UTC
1.6 15 km ENE of Hornbrook, California 01:22 UTC
1.8 17 km E of Carrick, CA 21:27 UTC
1.5 15 km SE of Ashland, Oregon 06:25 UTC
1.8 20 km NW of Macdoel, CA 08:58 UTC
2.0 24km SW of Mount Hebron, CA 21:59 UTC
1.8 2km SE of Grenada, CA 21:08 UTC
2.2 Oregon 22:12 UTC
1.8 20 km W of Klamath Falls, Oregon 10:23 UTC
2.1 16 km W of Klamath Falls, Oregon 21:32 UTC
2.0 12km W of Dorris, CA 11:54 UTC
1.8 17km W of Dorris, CA 21:37 UTC
1.7 12km SSW of Tennant, CA 12:43 UTC
1.8 7 km E of Ashland, Oregon 19:05 UTC

Counted from the QuakeIndex database, which ingests the USGS feed every 30 seconds · as of 02:16 UTC. 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.