The link should take you to a USGS map zoomed in on the slide in
satellite view. The quakes shown are from Jan 1, 2013 to a couple
days after the slide, within a 50 km radius.
There are 4 or 5 quakes fairly close to the slide but the last of
them occurred two weeks before the slide. The last quake before the
slide within 50 km occurred March 13, the slide being on March 22.
Brian
USGS OSO Quakes
https://earthquake.usgs.gov/earthquakes/map/?extent=48.26554,238.11665&extent=48.31323,238.20136&range=search&listOnlyShown=true&showUSFaults=true&baseLayer=satellite&timeZone=utc&settings=true&search={"name":"Search Results","params":{"starttime":"2013-01-01 00:00:00","endtime":"2014-03-25 23:59:59","latitude":48.2825,"longitude":-121.8480556,"maxradiuskm":50,"eventtype":"earthquake,accidental explosion,acoustic noise,acoustic_noise,anthropogenic_event,building collapse,chemical explosion,chemical_explosion,collapse,debris avalanche,eq,experimental explosion,explosion,ice quake,induced or triggered event,industrial explosion,landslide,meteor,meteorite,mine collapse,mine_collapse,mining explosion,mining_explosion,not existing,not reported,not_reported,nuclear explosion,nuclear_explosion,other,other event,other_event,quarry,quarry blast,quarry_blast,rock burst,Rock Slide,rockslide,rock_burst,snow avalanche,snow_avalanche,sonic boom,sonicboom,sonic_boom,train crash,volcanic eruption,volcanic explosion","orderby":"time"}}
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March 22 marks a solemn day in Washington history. It
was 11 years ago when the Oso/SR 530 landslide
occurred. Forty-three lives were lost in this tragic
event, the deadliest landslide in American history.
It was a Saturday morning. The sun was peeking through
the clouds, offering a pleasant early spring day. The
North Fork of the Stillaguamish River was receding in
the wake of three days of dry weather following a wet
winter.
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Then, just past 10:30 a.m. that morning, a large
segment of a hillside gave way, surging across the
valley just east of Oso in less than 60 seconds,
sweeping away everything in its path — including the
Steelhead neighborhood.
It remains unclear what triggered the massive slide.
Was it the river nibbling at the foot of the hillside?
Was it the weight of all the winter rainfall soaked
into the hillside? Were other factors involved?
Geologically, going back centuries, similar landslides
had occurred in the valley.
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The landslide temporarily blocked the river. Water in
the river backed up, flooding homes just upstream of
the slide area.
As the day wore on, concerns about the landslide-
blocked river steadily rose, raising theories about the
blockage suddenly giving way and producing a flash
flood-like surge of water downstream.
There were some authorities and downstream communities
who felt it was imperative to evac
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