Geotechnical Engineering Research Ideas Cascadia Working Group 05/15/2012

Cascadia Shakeout Scenario Potential SoCal EQ – Seismology – Structural – Geotechnical – Lifelines – Social – Public Policy – (Tsunami)

Subduction Motion Prediction Models Long-duration codas Long-period (high-frequency) NEED database of subduction zone events – Secondary need: synthetic earthquake motions to “fill out” database

Soil-fluid-structure interaction Mainshock -> Tsunami -> Aftershocks Instability – Tsunami structures – Seawalls – Critical Coastal Infrastructure

Silt Liquefaction Willamette Valley silts Portland Hills silts NOT sure how these silts will respond to the Cascadia event (or ordinary earthquake motion)

Site Response What will CSZ earthquake motion be when it reaches WV population centers?

Coastal & Cascadia Landslides Identifying landslides Landslide hazard mapping Large landslides Instability after shaking ceases