Earthquake · reviewed by a seismologist
M 2.5ml
Earthquake near Sequim, WA
No earthquake was likely felt in Sequim in the 24 hours to 8:03 am PST (16:03 UTC). The last one was M 4.2, 81 km (50 mi) SSE, at 2:05 pm PDT on 29 September 2026, estimated intensity II (weak) in town; 9,329 felt reports to USGS. Every earthquake near Sequim
This page: a magnitude 2.5 earthquake was recorded 15 km (9 mi) southeast of Sequim, WA, at 6:37 am PDT on 15 October 2018 (13:37 UTC), 53 km deep. 1 person has reported feeling it to USGS.
USGS: 5 km SE of Blyn, Washington
61 km (38 mi) NW of Seattle, WA · 52 km (32 mi) WNW of Shoreline, WA
- When
- 6:37 am PDT on 15 October 2018 ()
- Where
- 15 km (9 mi) southeast of Sequim, WA · earthquakes near Sequim
- Magnitude
- M 2.5 (ml)
- Depth
- 53 km below the surface
- Felt
- 1 report · strongest reported intensity I
- Nearest
- Island County, 28 km NE
- Nearest mapped fault
- Southern Whidbey Island fault, 22 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 2884 days ago
Earthquake alerts for Sequim, WA
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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 it was probably too small to be felt, even directly above it. In Sequim, 15 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: Port Hadlock-Irondale, Port Townsend, Port Ludlow, Lofall.
How big was it?
This earthquake released about 150 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 3.5 would have released about 32 times as much.
- Mineral, Virginia 2011 M 5.8 100,000× the energy of this one
- Magna, Utah 2020 M 5.7 72,000× the energy of this one
- Around the size people start to feel M 3.0 6.5× the energy of this one
- This earthquake M 2.5 about 150 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:
- 5.3 Eastern Olympic Peninsula, Washington · 21 km S 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 47.9898, -122.9547. Map © OpenStreetMap contributors.
Nearby places
| Place | Distance | Direction from the epicentre | |
|---|---|---|---|
| Island County, WA | 28 km (18 mi) | NE | earthquakes near Island County |
| Kitsap County, WA | 45 km (28 mi) | SSE | earthquakes near Kitsap County |
| Jefferson County, WA | 47 km (29 mi) | WSW | earthquakes near Jefferson County |
| San Juan County, WA | 59 km (36 mi) | N | earthquakes near San Juan County |
| Clallam County, WA | 71 km (44 mi) | WNW | earthquakes near Clallam County |
| Mason County, WA | 73 km (45 mi) | SSW | earthquakes near Mason 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.
- 1.8 17 km WNW of Coupeville, Washington
- 1.6 8 km NNW of Bangor Trident Base, Washington
- 2.2 15 km SSE of Friday Harbor, Washington
- 2.2 12 km WNW of Ault Field, Washington
- 2.3 12 km NW of Ault Field, Washington
- 2.4 6 km S of Quilcene, Washington
- 2.2 12 km WNW of Ault Field, Washington
- 1.7 12 km NW of Ault Field, Washington
- 1.6 1 km SW of Keyport, Washington
- 2.0 23 km WNW of Brinnon, Washington
- 1.8 9 km NNW of Freeland, Washington
- 1.6 5 km NNE of Kingston, Washington
- 1.8 10 km NE of Port Angeles East, Washington
- 1.7 20 km W of Brinnon, Washington
- 2.6 3 km WSW of Erlands Point-Kitsap Lake, 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.