Landslide susceptibility map reporting landslide Utah susceptibility without historical incidence data Landslide susceptibility map reporting landslide California susceptibility without historical incidence data Rating Scale Determination The Hazard Rating scale for landslides was determined using the following steps: The Landslide Overview Map of the Conterminous United States from USGS was identified as an interact-able map. The seven possible landslide region designations were identified and are defined below No data no data is reported for this region – Sus-mod region has moderate susceptibility to landslides and a low historical incidence – of landslides Sus-high region has high susceptibility to landslides and a low historical incidence of – landslides Combo high region has high susceptibility to landslides and a moderate historical – incidence of landslides Low region has both a low susceptibility to and historical incidence of landslides – Moderate region has both a moderate susceptibility to and historical incidence of – landslides High region has both a high susceptibility to and historical incidence of landslides – The landslide region designations were organized so that those with higher incidences and/or susceptibilities were considered a greater hazard. Hazard Rating Table Table 10. Landslide Hazard Ratings. Rating Hazard Hazard Landslide Region Designation Description Category Rating Occurrence Descriptor Very High 4 Frequent Area has (High) high landslide incidence and susceptibility. Area has moderate landslide incidence and susceptibility (Moderate) OR High 3 Occasional Area has one of the following landslide incidence and “combination” susceptibility (Combo-high): moderate incidence and high susceptibility; high incidence and moderate susceptibility.
Utah Landslide susceptibility map reporting landslide susceptibility without historical incidence data California Landslide susceptibility map reporting landslide susceptibility without historical incidence data Rating Scale Determination The Hazard Rating scale for landslides was determined using the following steps: The Landslide Overview Map of the Conterminous United States from USGS was identified as an interact-able map. The seven possible landslide region designations were identified and are defined below No data – no data is reported for this region Sus-mod – region has moderate susceptibility to landslides and a low historical incidence of landslides Sus-high – region has high susceptibility to landslides and a low historical incidence of landslides Combo high – region has high susceptibility to landslides and a moderate historical incidence of landslides Low – region has both a low susceptibility to and historical incidence of landslides Moderate – region has both a moderate susceptibility to and historical incidence of landslides High – region has both a high susceptibility to and historical incidence of landslides The landslide region designations were organized so that those with higher incidences and/or susceptibilities were considered a greater hazard. Hazard Rating Table Table 10. Landslide Hazard Ratings. Rating Category Hazard Rating Hazard Occurrence Descriptor Landslide Region Designation Description Very High 4 Frequent Area has high landslide incidence and susceptibility. (High) High 3 Occasional Area has moderate landslide incidence and susceptibility (Moderate) OR Area has one of the following “combination” landslide incidence and susceptibility (Combo-high): moderate incidence and high susceptibility; high incidence and moderate susceptibility.
HPH-THAM-End-to-End-Narrative-2017-02-01.docx