The second general meeting has led to a coordinated effort between the federal, state, city, University of Washington, and private companies. This has resulted in a more efficient use of resources and coverage of the areas of damage. A preliminary report is scheduled to be released in the next several weeks (~10 pp) followed by a detailed report of 50-60 pp in the next several months.
The combined meeting of all groups was very short and then the group broke up into special interest groups.
The following details are notes taken from the geology and geotechnical session.
| Area |
Type |
Details |
| 1st Ave. and Holgate |
Liquefaction |
in basement, piles sunken 1' to 5', dramatic |
| Puyallup River Valley |
No liquefaction
cracks
chimney |
1 chimney down, minute cracks at the 1965 liquefaction location |
| Sumner |
Liquefaction |
at one site |
| Burien |
Landslide
red tagged homes |
Landslide near bluff, structures damaged ~1' vertical and 4-5" horizontal; 8 red tagged homes; pre-existing inclinometer casing to 15' in area |
| Hwy 302—12 miles from Narrows |
Landslide |
Road section out, many layers of old asphalt on road base.1 meter vertical, 15 cm horizontal |
| Sammamish River Valley |
No liquefaction, ground cracks |
ground cracks near Red Hook |
| Port of Tacoma |
Settled area |
10' by 10' ~1" |
| Pier 37 |
Settlement |
Settlement over large area (timber supported pier) 7 cm |
| Dahl Playfield 78th & 25th Ave. NE |
Sand boils, ground cracks |
Sand boils and ½ cm ground cracks |
| Green Lake Northmost soccer field and northwest most baseball field |
Sand boils, and small fractures |
|
| West Green Lake Way |
Settlement and sand boils |
~10 cm settlement |
| Green Lake Path |
Lateral spreading |
Lateral spreading into lake about 100 yards east of Aqua Theater 80 cm long, 6-7 cm horizontal, and 5 cm vertical |
| Lower Snoq Valley at Borland Park |
Nothing |
|
| East of Gold Bar/Big Eddy |
Settlement |
2" |
| Lake Union |
Ground cracking |
Ground cracking along Westlake? |
| Port of Seattle/Terminal 30 |
Lateral spreading and sand boils |
Lateral spreading and sand boils 4 sets of cracks up to 1' each, many boils, irregular vertical displacement |
| Pioneer Square |
Settlement |
Settlement away from bldgs. 4-6 ~10' from buildings |
| AWV |
Sand boils, partially collapsed buildings, and Liquefaction |
Sand boils at switching yards, one track closed due to settlement/ejecta covered tracks. Sand was black silica in ejecta. Liquefaction continued along 1st Ave. S. down to Hanford. Two partially collapsed buildings. Liquefaction observed on all sides of Sodo Center |
| Seattle Underground |
No definite new damage |
|
| 14th/16th Ave. Bridge |
Settlement, |
Settlement at abutment, damage not related to soil, sand boils? At south abutment |
| Bellevue—SE 1st & 136 Ave. NE Glendale GC |
slide/flow |
300 yards of material flowed into Kelsey Creek |
| Duwamish corridor |
liquefaction |
Many liquefaction sites |
| North Green River Park |
Lateral spread |
Lateral spread 10's of meters long and 10 cm wide |
| Lake Union Westlake, 2700 block of Westlake Ave. N. |
Building settlement? Ground cracks |
Building settlement? Ground cracks along railroad row |
| Salmon Beach, just north of Tacoma Narrows Bridge on the north side |
Landslide
damaged homes |
Large slide—Several impacted buildings/homes. Some almost off foundations/stilts. Mud in homes |
| Hwy 202 near fish hatchery |
landslide/flow |
Approximately 1000 cubic yards moved into the creek Shoulder settled ~1 foot |
| Port of Loympia—Corky & B St. |
No liquefaction |
No liquefaction where expected |
| Lake Samm State Park, mouth of Iss Creek |
Sand boils |
Sand boils (coal debris) |
| Upper Green River Nothing where it crosses SR 18; Flaming Geysers Park |
no cracks, only small liquefaction features; reactivated landslide |
small liquefaction features in channel north of radio towers |
| Chambers Creek/ University Place |
lateral spreading |
Significant lateral spreading at bridge approaches: 4" to 5" drop |
| Terminal 5 |
Crane rail separation |
Couple inches of separation of crane rails, cranes still working |
| Additional Reports of Damage from Meeting (3/3/01) |
| Jones Road off Highway 169 |
Landslide |
Behind Park |
| Naval Reserve building |
Broken piles |
South end of Union, broken piles up to 18" of displacement |
| Pier 36 |
Movement |
|
| South 1st and Forest, 2900 block |
settlement, sand boils |
Large area with lots of movement and sand boils, 10 to 12 square blocks involved |
