Earthquake · reviewed by a seismologist
M 1.9md
Earthquake near Altamont, OR
USGS: 16 km SSW of Merrill, Oregon
- When
- 7:44 am PDT on 28 October 2016 ()
- Where
- 35 km (22 mi) S of Altamont, OR · earthquakes near Altamont
- Magnitude
- M 1.9 (md)
- Depth
- -1.8 km below the surface
- Felt
- no reports yet
- Nearest
- Siskiyou County, 78 km WSW
- 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 · we first saw it 3521 days ago
A magnitude 1.9 earthquake was recorded 35 km (22 mi) S of Altamont, OR, at 7:44 am PDT on 28 October 2016 (14:44 UTC). This was a minor earthquake. Quakes this small are rarely felt and do not cause damage.
How big was it?
This earthquake released about 22 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 2.9 would have released about 32 times as much.
- Mineral, Virginia 2011 M 5.8 680,000× the energy of this one
- Magna, Utah 2020 M 5.7 480,000× the energy of this one
- Around the size people start to feel M 3.0 43× the energy of this one
- This earthquake M 1.9 about 22 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
Epicentre 41.8950, -121.6900. Map © OpenStreetMap contributors.
Nearby places
| Place | Distance | Direction from the epicentre | |
|---|---|---|---|
| Siskiyou County, CA | 78 km (48 mi) | WSW | earthquakes near Siskiyou County |
| Modoc County, CA | 87 km (54 mi) | ESE | earthquakes near Modoc County |
| Klamath County, OR | 88 km (55 mi) | N | earthquakes near Klamath County |
| Jackson County, OR | 100 km (62 mi) | NW | earthquakes near Jackson County |
| Lake County, OR | 146 km (91 mi) | NE | earthquakes near Lake County |
Places and coordinates from the US Census Bureau Gazetteer (2024). Distances are from the epicentre.
Aftershocks so far
51 earthquakes have been recorded within 50 km since this one.
- 2.1 16 km W of Klamath Falls, Oregon
- 2.0 12km W of Dorris, CA
- 1.9 15 km W of Klamath Falls, Oregon
- 1.9 9 km N of Klamath Falls, Oregon
- 1.8 17km W of Dorris, CA
- 2.0 10 km NNW of Klamath Falls, Oregon
- 2.4 7 km E of Bonanza, Oregon
- 1.9 8km SSE of Tennant, CA
- 2.4 9 km WSW of Klamath Falls, Oregon
- 2.5 6km SW of Dorris, CA
- 1.9 6km NNE of Macdoel, CA
- 1.5 1km WNW of Tulelake, CA
- 1.9 1km WNW of Tulelake, CA
- 2.0 11km N of Tennant, CA
- 1.6 11 km SSE of Bonanza, Oregon
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.