1 On-Going Study of SR-530 Landslide T.D. Stark, A. Baghdady, O. Hungr, and J. Aaron University of Illinois at Urbana-Champaign tstark@illinois.edu T.D. Stark © 2014 Sandi Doughton Seattle Times May 4, 2015 Ancient Slide Blocks • 48-0 • $6.6M • Low Elevation v. High Elevation Slides - small runout v. long runout T.D. Stark © 2014 2 Ancient Landslide 2013 LIDAR illinois.edu Stark et al. (2015) Ancient Landslide 2013 LIDAR 1 :6 I illinois.edu Stark et al. (2015) Ancient Stratigraphy Elevation (feet) 10000. 200 400 600 800 1000 1200 1400 1600 1800 2000 2200 2400 2600 28001000 900 1, 900 800 omen-JeffWeak Anisotropic 700 Va rved Layers 600 600 500 500 400 400 300 300 200 .n . .. r~ 200 Sands-arid Gravels- Pos'smle Mala-h 100 4 .100 0 200 400 600 800 1000 1200 1400 1600 1800 2000 2200 2400 2600 2800 Distance (feet) Section illinois.edu Stark et al. (2015) Ancient Slide 200 400 600 800 1000 1200 1400 1600 1600 2000 2200 2400 2600 2800 ?1000 1000 900 900 . 'oll/ q: 800 *?Fine-Sa?600 600 500 500 400 400 300 300 200 Sand-s Possible Armsian 200 100 . 200 400 600 800 1000 1200 1400 1600 1800 2000 2200 2400 2600 2800 Distance (feet) Section I Photos from Dale Topham 1 iHinoiLedu Stark et al. (2015) Ancient Slide 200 400 600 800 1000 1200 1400 1600 1800 2000 2200 2400 2600 2800 1000 1000 900 900 13? 800 ?fie'?and600 Rlver 600 500 500 400 400 300 see 200 200 Sands an dTGravels Possible Artesian 100 100 . I 4 4 . 0 200 400 600 800 1000 1200 1400 1600 1800 2000 2200 2400 2600 2800 Distance (feet) Section j[ iHinoiLedu Stark et al. (2015) 2014 Sand Erosion .edu 111015 ill Ancient Slope after River Erosion Elevation (feet) 0 200 400 600 800 1000 1200 1400 1600 1800 2000 2200 2400 2600 2800 1000 I 1000 ,2 ?F3_ur?p 900 a 900 R?c?s?onalC&?wwsh??wt goo Hm ands AnCIent Bench 800 700 700 600 600 500 500 400 400 300 300 200 . . .. ., . 200 . 100 . 200 400 600 800 1000 1200 1400 1600 1800 2000 2200 2400 2600 2800 Distance (feet) Section illinois.edu Stark et al. (2015) 1952 Slide 10 2200 200 600 800 1000 1200 1400 1600 1800 2000 2400 2600 2800 1952 Slip Surface Elevation (feet) 8 300 200 sands and'Gra'vets PbS's?lble 'Art?sian 1000 2600 1460 1600 Distance (feet) 100- 0 200 400 600 800 1200 1800 2000 2200 2400 Section iHinoiLedu Stark et al. (2015) 2800 1000 900 800 I 700 600 500 400 i: 200 100 illinois.edu Stark et al. (2015) 1965 1969 Photos 1965 Before Before 1933 -1967 >34 yrs1969 After 11 12 1967 Slide Elevation (feet) 0 200 400 600 800 1000 1200 1400 1600 1800 2000 2200 2400 2600 2800 ?1000 1000 900 - 900 800 - 800 700 - 700 600 - 600 500 - 500 400 - 400 300 - 300 200 Sands; and Gravels~ PossibleArte'SIan 200 100 . 200 400 600 800 1000 1200 1400 1600 1800 2000 2200 2400 2600 2800 Distance (feet) Section illinoi5.edu Stark et al. (2015) 2006 (Before) & 2006 (After) Photos 2006 Before Stark et al. (2015) 2006 -1967 39 yrs. 2006 After 13 2006 Landslide 14 0 200 400 600 800 1000 1200 1400 1600 1800 2000 2200 2400 2600 2800 1000 1000 900 200 Sandsaand Grave?lsi - PessmleArtwan 1 00 . 100 0 200 400 600 800 1000 1200 1400 1600 1800 2000 2200 2400 2600 2800 Distance (feet) Section illinois.edu Stark et al. (2015) 2006 Slide 15 0 200 400 600 800 1000 1200 1400 1600 1800 2000 2200 2400 2600 2800 1000 1000 900 -- - 900 'Reoessional Outw ?201 3 ?3 300 "-Fine Sands - Evacuation - 800 8 - - Accumulation 700 700 Sands andGrav-els200 400 600 800 1000 1200 1400 1600 1800 2000 2200 2400 2600 2800 illinoi5.edu Stark et al. (2015) Distance (feet) Section 2006 Slide 16 illinois.edu Stark et al. (2015) Ancient La dslide 2013 LIDA .4. . L- I I If li l1? . u- . . .- illinois.edu Stark et al. (2015 I Historic Landslides 18 illinois.edu Stark et al. (2015) L_lizm140nmm ?mummy ?mm-1mm, 13:3? anemia-Bout? ?ranmao?om a: 2013 GEER, 2014 Elevation (feet) Elevation (feet) illinois.edu Stark et al. (2015) 2014 Landslide 200 400 600 800 1000 1200 1400 1600 1800 2000 2200 2400 2600 2800 0 1000 1000 - ?2003 ?2013 Evacuation. Accumulation 900 900 800 800 I'Sands and Gravel: - Possible Mam 20200 400 600 600 1000 1200 1400 1600 1800 2000 2200 2400 2600 2800 Distance (feet) 200 400 600 800 1000 1200 1400 1600 1800 2000 2200 2400 2600 2800 1000' 1 100( 900 ?201 3 90C ?2014 800 Evacuation_ 80C - Accumulation 700 700 600 60C 500 500 400 40C 300 30C 200 a 20C Sands Gravels Possible Ntesnan 100200 400 600 800 1000 1200 1400 1600 1800 2000 2200 2400 2600 2800 Distance (feet) Section illinois.edu Stark et al. (2015) 21 2014 Lacustrine Slide 200 400 600 800 1000 1200 1400 1600 1800 2000 2200 2400 2600 28001000 0 1000 900 - 900 2014 river 800 800 700 700 600 600 500 500 Elevation (feet200 400 600 300 1000 1200 1400 1600 1800 2000 2200 2400 2600 2800 Distance (feet) Section illinois.edu Stark et al. (2015) 2014 Colluvium Slide Mass 22 - Sand over Clay [3 illinoi5.edu Stark et al. (2015) Failure Mechanism 1 illinois.edu Stark et al. (2015) Elevation (feet) 24 2014 Whitman Bench #2 1000 200 400 600 800 1000 1200 1400 1600 1800 2000 2200 2400 2600 28001000 900 900 800 - 800 700 200 400 600 300 1000 1200 1400 1600 1800 2000 2200 2400 2600 2800 Distance (feet) Section illinois.edu Stark et al. (2015) 25 Override Zone Elevation (feet) 0 1000' 2800 1000 2200 2400 2600 200 400 600 800 1000 1200 1400 1600 1800 2000 900 I. -- 900 800 . Trees from Whitman Bench I 800 700 700 Override zone 600 600 .. . rev9'6?3?05200 1400 1600 1800 2000 2200 2400 2600 2800 Distance (feet) 400 600 800 1000 1200 H1inois.edu Stark et al. (2015) 26 2014 Override Zone End of Whitman Block #2 1 illinois.edu Stark et al. (2015) 2014 Override Zone illinois.edu Stark et al. (2015) 2014 Failure Mechanism 28 1000 200 400 60? 800 1000 1200 1400 1600 1800 2000 2200 2400 2600 28m%000 900 . 900 800 800 700 700 Elevation (feet) 300 200 100 0 200 Ulinois.edu Stark et al. (2015) 400 2014 River 1600 1800 Distance (feet) ?7 600 800 1000 1200 1400 Section 600 - 500 - 400 300 200 100 2014 Slide Mass 1 - . .r 14*. H1inois.edu Stark et al. (2015) ..P ?rl . 5- . From Ralph A. Haugerud (2014) 2013 LIDAR illinois.edu Stark et al. (2015) Ancient Slide Blocks 31 - 48-0 illiliois.edl1 sz uwsimday GheSea?le?llmes I SUNDAY. APRIL 19, 2015 Governor signs bill to boost mapping of geologic hazards MOTHER TOLD 0F ALLEGED SLAP, SAYS DISTRICT BUS DRIVER ACCUSED 0F HITTING CHILD Parent had said she wasn?t noti?ed By SARA BAN KEEN Seattle Times sra?repo rter Highline Public Schools followed protocols in notifying a student's par? ents of an allegation that their 6~year~old autistic son had been slapped by a school-bus driver last month, a spokeswoman said Saturday. Elizabeth Lysho], the child?s mother, said Friday that she learned of the incident involving her son, Christian, from an- other student and wasn?t contacted by the school. ?We fully support the family. We want to make sure something like this never happens again and that Christian is transport- ed to and from school in a way that meets his unique needs,? district spokes- woman Catherine Car- bone Rogers said. A news story on Satur- day?s front page of The Seattle Times reported Stark et al. (2015) The Associated Press OLYMPIA Gov. Jay Inslee has signed a bill that will allow Washington to have more information than ever about geologic hazards that threaten communities and citizens. Senate Bill 5083 requires an expansion of HDAR map- ping of geologic hazards and a thorough dissemination of that information. It?s the ?rst major public-policy initiative created in response to the 050 landslide. The bill, requested by the Washington State Depart- ment of Natural Resources (DNR), passed on a 97-0 vote in the House earlier this month. The Senate ap- proved the measure 48-0 in February. Inslee said the 050 trage- dy of March 22, 2.014, in which 43 people died, high- lighted the need for the bill. Commissioner of Public Lands Peter Goldmark said the bill will help save lives and property from disasters Read more coverage of the 050 landslide: seo?letimesxomx? USO-landslide similar to what happened in Oso. "We live in an age in which we have unprece? dented aceess to technolo- gies that can tell us more than we ever imagined about the natural forces that shape our world,? Goldmark said. ?Using the best tech- nology available to identify these dangers before they cause major harm and de? struction is smart govern- ment and the right thing to do for the people of Wash- ington." DNR, home of the Wash- ington Geological Survey, is responsible for surveying and mapping the state?s geologic hazards. Expanding the database of LIDAR maps of hazards was one of the agency?s top priorities dur- al- ing the legislative session. LIDAR (Light Detection and Ranging} uses lasers mounted on aircraft to scope topography by measuring re?ected light. light beams penetrate forest can~ Opy, ground cover and hu- man development to allow mappers and scientists to see the topography of land- forms below with pinpoint aCcuracy. Lanai-takers must make a budget appropriation in order for DNR to implement the program in a meaningful way, Goldmark said. The program is estimated to cost $6.6 million. DNR would use that funding to hire 10 geologists and four employees to provide tech nical support. w. a Delectable day to be wai E. gfo a nibble Ancient Slide Blocks • 48-0 • $6.6M • Low Elevation v. High Elevation Slides - small runout v. long runout 32 New Slide Led I: illinois.edu Stark et al. (2015) Elevation (feet) 10000 200 400 600 800 1000 1200 1400 1600 1800 2000 2200 2400 2600 2800 000 900 900 800 800 700 200 400 600 800 1000 1200 1400 1600 1800 2000 2200 2400 2600 2800 Distance (feet) 33 34 New Slide Ledge . .- . - . 2013 LIDAR ., .- .- 7' - . 2014 LIDAR 1933-2014=81 years 1 illinois.edu Stark et al. (2015) 35 Chronology River Movement Since 1933 2006 Slide 200 North 600 1967 Slide 400 100 50 0 Jan‐30 200 > 34 Years 0 Jan‐40 Jan‐50 Jan‐60 Jan‐70 Jan‐80 ‐50 Jan‐90 Jan‐00 1984‐1989 Timbering Jan‐10 8 Years Jan‐20 ‐200 South 39 Years ‐100 ‐400 ‐600 ‐150 2014 Slide ‐200 River movement Stark et al. (2015) ‐800 Year Finney Creek Gold Hill Gauge Darrington Rain Gauge Darrington (mm) Displacement of the river with respect to 1933 (m) 150 800 Summary • • • • • • • 2006 Slide in lacustrine deposit Whitman Bench marginally stable since 2006 Heavy rainfall in March, 2014 ~ 100-yr Small lacustrine slide undermined Whitman Bench Whitman Bench = Large volume, energy, & runout Explains SR-530 being only large slide Hazard Mapping - ancient slide blocks - removal of slide blocks - identify areas of Whitman Bench involvement Stark et al. (2015) 36 37 On-Going Study of SR-530 Landslide T.D. Stark, A. Baghdady, O. Hungr, and J. Aaron University of Illinois at Urbana-Champaign tstark@illinois.edu Sandi Doughton Seattle Times May 4, 2015