Earthquake · reviewed by a seismologist
M 1.8ml
11 km NNW of Molalla, OR
Yes. A magnitude 1.8 earthquake was recorded 11 km NNW of Molalla, OR, 54 km (33 mi) SSE of Portland, OR, at 2:35 am PDT on 11 July 2018 (09:35 UTC), 12 km deep.
54 km (33 mi) SSE of Portland, OR · 44 km (27 mi) ENE of Salem, OR
- When
- Magnitude
- M 1.8 (ml)
- Depth
- 12 km below the surface
- Felt
- no reports yet
- Nearest
- Marion County, 19 km SSW
- Nearest mapped fault
- Mount Angel fault, 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 3047 days ago
Earthquake alerts for Molalla, OR
Get a notification in this browser when USGS records an earthquake near Molalla, OR. 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 6 km (4 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.
Earthquakes near other towns within 30 km: Molalla, Mulino, Silverton, Mount Angel, Beavercreek, Canby.
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 5.7 730,000× the energy of this one
- Around the size people start to feel M 3.0 65× 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.
Where
Epicentre 45.0652, -122.5000. Map © OpenStreetMap contributors.
Nearby places
| Place | Distance | Direction from the epicentre | |
|---|---|---|---|
| Marion County, OR | 19 km (12 mi) | SSW | earthquakes near Marion County |
| Clackamas County, OR | 26 km (16 mi) | ENE | earthquakes near Clackamas County |
| Multnomah County, OR | 54 km (34 mi) | N | earthquakes near Multnomah County |
| Linn County, OR | 64 km (40 mi) | S | earthquakes near Linn County |
| Yamhill County, OR | 67 km (42 mi) | WNW | earthquakes near Yamhill County |
| Washington County, OR | 72 km (45 mi) | NW | earthquakes near Washington County |
Places and coordinates from the US Census Bureau Gazetteer (2024). Distances are from the epicentre.
Aftershocks so far
47 earthquakes have been recorded within 50 km since this one.
- 1.7 3 km SW of Scotts Mills, Oregon
- 1.6 21 km ESE of Molalla, Oregon
- 2.0 7 km ESE of Molalla, Oregon
- 1.8 2 km SW of Tualatin, Oregon
- 1.8 1 km ESE of Butteville, Oregon
- 2.0 Washington-Oregon border region
- 1.9 3 km E of Sherwood, Oregon
- 1.8 0 km E of Sherwood, Oregon
- 1.7 3 km SW of Tualatin, Oregon
- 1.8 5 km E of Silverton, Oregon
- 2.0 4 km E of Scotts Mills, Oregon
- 2.2 3 km W of Mehama, Oregon
- 1.8 Washington-Oregon border region
- 1.6 7 km E of Molalla, Oregon
- 1.6 2 km E of Sherwood, 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.