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Light earthquake, 4.1 mag strikes near Snoqualmie in Washington

Earthquake location 47.558S, -121.803WA light earthquake magnitude 4.1 (ml/mb) has struck on Saturday, 3 kilometers (2 miles) from Snoqualmie in Washington. A tsunami warning has been issued near Snoqualmie in Washington (Does not indicate if a tsunami actually did or will exist). Exact location of earthquake, -121.803° West, 47.558° North, depth 6 km. Event id: at00nul4sz. Ids that are associated to the earthquake: at00nul4sz. The earthquake was roughly at a depth of 6 km (4 miles). The temblor was detected at 15:22:11 / 3:22 pm (local time epicenter). Exact time and date of event in UTC/GMT: 12/09/15 / 2015-09-12 22:22:11 / September 12, 2015 @ 10:22 pm.

Nearest city/cities or towns, with min 5000 pop, to epicentrum/hypocenter was Yelm, Camano, Stanwood. Nearby country/countries, United States (c. 310 233 000 pop) (That might be effected). The epicenter was 40 km (25 miles) from Seattle (c. 608 700 pop), 59 km (37 miles) from Tacoma (c. 198 400 pop), 30 km (19 miles) from Bellevue (c. 122 400 pop), 56 km (34 miles) from Everett (c. 103 000 pop), 38 km (24 miles) from Kent (c. 92 400 pop), 32 km (20 miles) from Renton (c. 90 900 pop).

In the past 24 hours, there have been one, in the last 10 days one, in the past 30 days one and in the last 365 days nine earthquakes of magnitude 3.0 or greater that has struck near. Earthquakes 4.0 to 5.0 are often felt, but only causes minor damage. Each year there are an estimated 13,000 light quakes in the world.

Did you feel the quake?

How did you respond? Did any furniture slide, topple over, or become displaced? Leave a comment or report about activity, shaking and damage at your home, city and country. Read more about the earthquake, Distances, Seismometer information, Date-Time, Parameters, Location and details about this quake, that has struck: 3 km NNE of Snoqualmie, Washington. This data comes from the USGS Earthquake Notification Service.

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More information

Parameter Value Description
Magnitude 4.1 mb The magnitude for the event.
Longitude -121.803° West Decimal degrees longitude. Negative values for western longitudes.
Latitude 47.558° North Decimal degrees latitude. Negative values for southern latitudes.
Depth 6 km Depth of the event in kilometers.
Place 3km NNE of Snoqualmie, Washington Textual description of named geographic region near to the event. This may be a city name, or a Flinn-Engdahl Region name.
Time 2015-09-12 22:22:11 Time when the event occurred. UTC/GMT
Updated 2015-09-12 22:25:28 Time when the event was most recently updated. UTC/GMT
Timezone offset -420 Timezone offset from UTC in minutes at the event epicenter.
Felt 2 The total number of felt reports
CDI 2.7 The maximum reported intensity for the event.
MMI The maximum estimated instrumental intensity for the event.
Alert Level The alert level from the PAGER earthquake impact scale. Green, Yellow, Orange or Red.
Review Status REVIEWED Indicates whether the event has been reviewed by a human.
Tsunami 1 This flag is set to "1" for large events in oceanic regions and "0" otherwise. The existence or value of this flag does not indicate if a tsunami actually did or will exist.
SIG 259 A number describing how significant the event is. Larger numbers indicate a more significant event.
Network at The ID of a data contributor. Identifies the network considered to be the preferred source of information for this event.
Sources ,at, A comma-separated list of network contributors.
Number of Stations Used 21 The total number of Number of seismic stations which reported P- and S-arrival times for this earthquake.
Horizontal Distance 0 Horizontal distance from the epicenter to the nearest station (in degrees).
Root Mean Square 0.7 sec The root-mean-square (RMS) travel time residual, in sec, using all weights.
Azimuthal Gap 50.4 The largest azimuthal gap between azimuthally adjacent stations (in degrees).
Magnitude Type Ml The method or algorithm used to calculate the preferred magnitude for the event.
Event Type earthquake Type of seismic event.
Event ID at00nul4sz Id of event.
Event Code 00nul4sz An identifying code assigned by, and unique from, the corresponding source for the event.
Event IDS ,at00nul4sz, A comma-separated list of event ids that are associated to an event.


  1. Sandy

    We live on the ridge in Snoqualmie, and felt the tremors. They lasted about 10 seconds. A vase on the mantle rattled, but no overturned furniture,etc. It was very noticeable what was happening. We had people on 3 levels and everyone started texting do you feel that????

  2. Emily Hill, Columnist

    Saturday, Sept. 12th ~ At 3:22 pm I was typing at a little typing stand on the 5th floor of a condo located at the south edge of Echo Lake, Shoreline, WA.

    I felt the quake unmistakably and reported it on Facebook at 3:24, asking if other’s in my community had felt it. Few had.

    It was a sharp ‘whip’ that shimmered the floorboards for 3-4 seconds creating a shimmer of a vibration that radiated up my typing stand. The wands of my levelors swayed before I felt a soft roll of an aftershock 2-3 seconds long as the sharp ‘whip’ died down.

    The whole sensation lasted no more than 8 seconds.

    No damage, no displaced furniture, no rattling dishes.

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