QuakeIndex

Earthquake · reviewed by a seismologist

M 1.7md

Earthquake near Ashland, OR

USGS: 20 km E of Hornbrook, California

7:42 pm PDT, May 28, 2016 · · 15 km deep · released about 9.6 lb of TNT

Every earthquake near Ashland Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Siskiyou County 41 kmJackson County 63 kmKlamath County 101 kmJosephine County 117 km
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
7:42 pm PDT on 28 May 2016 ()
Where
46 km (28 mi) SE of Ashland, OR · earthquakes near Ashland
Magnitude
M 1.7 (md)
Depth
15 km below the surface
Felt
no reports yet
Nearest
Siskiyou County, 41 km SSW
Nearest mapped fault
Cedar Mountain fault system, 15 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 3522 days ago

A magnitude 1.7 earthquake was recorded 46 km (28 mi) SE of Ashland, OR, at 7:42 pm PDT on 28 May 2016 (02:42 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 9.6 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.

  1. Mineral, Virginia 2011 M 5.8 1,600,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 1,100,000× the energy of this one
  3. Around the size people start to feel M 3.0 99× the energy of this one
  4. This earthquake M 1.7 about 9.6 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 lists one earthquake of M5 or more within 50 km:

  1. 5.1 20 km WNW of Klamath Falls, Oregon · 48 km NNE 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 41.9163, -122.3053. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection from the epicentre
Siskiyou County, CA 41 km (26 mi) SSW earthquakes near Siskiyou County
Jackson County, OR 63 km (39 mi) NNW earthquakes near Jackson County
Klamath County, OR 101 km (63 mi) NNE earthquakes near Klamath County
Josephine County, OR 117 km (73 mi) WNW earthquakes near Josephine County

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

Aftershocks so far

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

  1. 2.1 13 km N of Dorris, California
  2. 2.6 23km SW of Mount Hebron, CA
  3. 2.6 25km ENE of Hornbrook, CA
  4. 1.8 21 km WNW of Dorris, California
  5. 1.7 17 km SW of Ashland, Oregon
  6. 1.8 18 km SW of Ashland, Oregon
  7. 3.1 19 km SW of Ashland, Oregon
  8. 1.5 7 km ENE of Ashland, Oregon
  9. 1.7 9 km E of Ashland, Oregon
  10. 3.2 18 km SW of Ashland, Oregon
  11. 1.8 22km ENE of Montague, CA
  12. 1.7 10km W of Dorris, CA
  13. 1.5 20 km WNW of Macdoel, California
  14. 1.9 4 km SSE of Hornbrook, California
  15. 1.9 9km ESE of Hornbrook, 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

QuakeIndex does not issue warnings. For earthquake early warning see ShakeAlert.