1. LANDSLIDE INVENTORIES THE KEY TO SEISMIC LANDSLIDE HAZARD ANALYSIS

2. IMAGERY CRITERIA Must be continuous and span entire landslide distribution Must have resolution of < 1 m Must have stereo coverage or be draped over DEM for stereo perspective Must be cloud free and acquired as soon as possible after earthquake

3. MAPPING CRITERIA Landslides must be defined as polygons Polygons must be plotted on topographic base or geo-registered image Entire population must be mapped and margins digitized

4. LANDSLIDE INVENTORY NORTHRIDGE EARTHQUAKE

5. LANDSLIDE INVENTORY CHI-CHI EARTHQUAKE

6. LANDSLIDE INVENTORY GUATEMALA EARTHQUAKE

7. SEISMIC LANDSLIDE HAZARD MAP Components- Slope Map Material Properties Strong-Motion Data

8. Digital Geologic Maps

9. Shear Strength Data

10. Digital Elevation Model

11. Slope Map

12. Slope Susceptibility Map

13. Seismic Shaking

14. Newmark Displacement

15. Comparison of Displacement with Landslide Cells

16. NORTHRIDGE-SEISMIC LANDSLIDE HAZARD MAP

17. LANDSLIDE INVENTORIES FROM SATELLITE IMAGERY ORTHORECTIFIED IMAGE GEOREGISTERED DIGITAL ELEVATION MODEL

21. SEISMIC LANDSLIDE MAPPING CAPABILITY 1994 Current Status U.S. Air ForcePrivate Companies Stereo CoverageNon Stereo Coverage < 1 m resolution Cost-$200.00 Cost-  $150,000.00 Complete Coverage  60% Coverage

22. With all the technological improvements in the last 15 years, we often cannot do as good a job of seismic landslide hazard analysis as we did in 1994.