explosion · reviewed by a seismologist
M 1.7ml
Earthquake near Hillsboro, OR
No earthquake was likely felt in Hillsboro in the 24 hours to 6:32 pm PST (02:32 UTC). The last one was M 2.2, 14 km (8 mi) NW, at 1:37 pm PDT on 1 October 2025, estimated intensity II (weak) in town. Every earthquake near Hillsboro
No: USGS classifies this as a explosion, not an earthquake. A magnitude 1.7 explosion was recorded 32 km (20 mi) west-northwest of Hillsboro, OR, at 11:31 am PDT on 24 August 2023 (18:31 UTC), less than 1 km deep.
USGS: Oregon
56 km (35 mi) WNW of Portland, OR · 36 km (22 mi) WNW of Hillsboro, OR
- When
- 11:31 am PDT on 24 August 2023 ()
- Where
- 32 km (20 mi) west-northwest of Hillsboro, OR · earthquakes near Hillsboro
- Magnitude
- M 1.7 (ml)
- Depth
- -0.4 km below the surface
- Felt
- no reports yet
- Nearest
- Washington County, 23 km ESE
- Status
- Reviewed by a seismologist
USGS · last changed by USGS · we first saw it 1175 days ago
Earthquake alerts for Hillsboro, OR
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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 12 km (7 mi) from the epicentre. In Hillsboro, 32 km away, the estimate is intensity II (weak). 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: Banks, Forest Grove, Vernonia, Cornelius, North Plains.
USGS catalogues this as explosion, not an earthquake.
How big was it?
This earthquake released about 11 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.
- Mineral, Virginia 2011 M 5.8 1,400,000× the energy of this one
- Magna, Utah 2020 M 5.7 970,000× the energy of this one
- Around the size people start to feel M 3.0 86× the energy of this one
- This earthquake M 1.7 about 11 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 45.6610, -123.3502. Map © OpenStreetMap contributors.
Nearby places
| Place | Distance | Direction from the epicentre | |
|---|---|---|---|
| Washington County, OR | 23 km (14 mi) | ESE | earthquakes near Washington County |
| Columbia County, OR | 38 km (23 mi) | NNE | earthquakes near Columbia County |
| Tillamook County, OR | 39 km (24 mi) | SW | earthquakes near Tillamook County |
| Yamhill County, OR | 46 km (29 mi) | S | earthquakes near Yamhill County |
| Clatsop County, OR | 49 km (30 mi) | NW | earthquakes near Clatsop County |
| Clark County, WA | 68 km (42 mi) | E | earthquakes near Clark County |
Places and coordinates from the US Census Bureau Gazetteer (2024). Distances are from the epicentre.
Aftershocks so far
46 earthquakes have been recorded within 50 km since this one.
- 1.7 8 km SW of Vernonia, Oregon
- 1.6 8 km S of Scappoose, Oregon
- 1.6 13 km NE of Vernonia, Oregon
- 2.1 4 km NE of Lafayette, Oregon
- 1.6 24 km NNW of Sheridan, Oregon
- 1.6 13 km E of Wheeler, Oregon
- 1.9 4 km NE of Lafayette, Oregon
- 1.8 8 km SW of Scappoose, Oregon
- 2.2 2 km SSW of Banks, Oregon
- 2.0 3 km WSW of Dundee, Oregon
- 2.0 16 km W of Forest Grove, Oregon
- 1.7 4 km NNE of Lafayette, Oregon
- 1.6 21 km W of Forest Grove, Oregon
- 1.6 10 km WSW of Felida, Washington
- 1.6 4 km ENE of Lafayette, 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.