Earthquake · reviewed by a seismologist
M 2.1ml
Earthquake near Monroe, WA
No earthquake was likely felt in Monroe in the 24 hours to 7:18 pm PST (03:18 UTC). The last one was M 4.2, 76 km (47 mi) SW, at 2:05 pm PDT on 29 September 2026, estimated intensity II (weak) in town; 9,329 felt reports to USGS. Every earthquake near Monroe
This page: a magnitude 2.1 earthquake was recorded 6 km (4 mi) north-northwest of Monroe, WA, at 9:27 am PDT on 4 July 2017 (16:27 UTC), 17 km deep. 23 people have reported feeling it to USGS.
USGS: 2 km NE of Roosevelt, Washington
42 km (26 mi) NE of Seattle, WA · 16 km (10 mi) ESE of Everett, WA
- When
- 9:27 am PDT on 4 July 2017 ()
- Where
- 6 km (4 mi) north-northwest of Monroe, WA · earthquakes near Monroe
- Magnitude
- M 2.1 (ml)
- Depth
- 17 km below the surface
- Felt
- 23 reports · strongest reported intensity III
- Nearest
- Snohomish County, 23 km NE
- Nearest mapped fault
- Southern Whidbey Island fault, 7 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 3184 days ago
Earthquake alerts for Monroe, WA
Get a notification in this browser when USGS records an earthquake near Monroe, WA. 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 5 km (3 mi) from the epicentre. In Monroe, 6 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: Monroe North, Three Lakes, Woods Creek, Snohomish, Machias, Bunk Foss.
How big was it?
This earthquake released about 43 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 3.1 would have released about 32 times as much.
- Mineral, Virginia 2011 M 5.8 350,000× the energy of this one
- Magna, Utah 2020 M 5.7 250,000× the energy of this one
- Around the size people start to feel M 3.0 22× the energy of this one
- This earthquake M 2.1 about 43 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 3 earthquakes of M5 or more within 50 km:
- 5.4 8 km NNE of Lake Marcel-Stillwater, Washington · 19 km SSE of this epicentre
- 5.2 9 km NE of Lake Marcel-Stillwater, Washington · 22 km SSE of this epicentre
- 5.0 4 km ENE of Machias, Washington · 10 km N 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 47.9117, -121.9882. Map © OpenStreetMap contributors.
Nearby places
| Place | Distance | Direction from the epicentre | |
|---|---|---|---|
| Snohomish County, WA | 23 km (14 mi) | NE | earthquakes near Snohomish County |
| King County, WA | 48 km (30 mi) | SSE | earthquakes near King County |
| Island County, WA | 58 km (36 mi) | WNW | earthquakes near Island County |
| Kitsap County, WA | 58 km (36 mi) | WSW | earthquakes near Kitsap County |
| Skagit County, WA | 66 km (41 mi) | N | earthquakes near Skagit County |
| Pierce County, WA | 96 km (60 mi) | S | earthquakes near Pierce County |
Places and coordinates from the US Census Bureau Gazetteer (2024). Distances are from the epicentre.
Aftershocks so far
55 earthquakes have been recorded within 50 km since this one.
- 1.6 3 km W of Redmond, Washington
- 1.7 3 km SE of Duvall, Washington
- 1.6 2 km S of West Lake Sammamish, Washington
- 1.9 5 km NE of Oso, Washington
- 2.7 4 km WSW of Mercer Island, Washington
- 1.8 1 km SSW of Esperance, Washington
- 1.9 3 km E of Granite Falls, Washington
- 2.3 2 km WNW of Redmond, Washington
- 1.7 2 km N of Mercer Island, Washington
- 2.5 0 km S of Esperance, Washington
- 1.9 7 km SSW of Clinton, Washington
- 1.6 1 km S of Lake Marcel-Stillwater, Washington
- 1.8 4 km E of Granite Falls, Washington
- 2.3 6 km W of Lake Cavanaugh, Washington
- 1.7 1 km N of Lake Roesiger, Washington
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.