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Use the below Landslide Hazard maps from Buncombe county NC to answer questions 19 and 20. STABILITY INDEX MAP OF BUNCOMBE COUNTY, NORTH CAROLINA FILTRAT HERENTESEPTI Possible Influence of Map Color Predicted Stability Code Zone Relative Debris/Earth Flow Slide Hazard Ranking Stability Index Range Factor of Safety Probability of Predicted Stability with Parameter Ranges Used in Analysis (FS) Instability Stabilizing or Destabilizing Factors Unstable 0 Maximum FS <1 100% Kange cannot model stability Stabilizing factors required for stability High Upper Threshold of Instability 0-0.5 >50% of FS 1 Optimistic half of range required for stability Stabilizing factors may be responsible for stability Lower Threshold of Instability Moderate 05-1 >50% of FS >1 Pessimistic half of range required for instability Destabilizing factors are not required for instability Cannot model instability with most conservative Nominally Stable 1-1.25 Minimum FS = l Minor destabilizing factors could lead to instability parameters specified Moderately Stable Low 1.25-1.5 Minimum PS= 1.25 Cannot model instability with most conservative parameters specified Moderate destabilizing factors are required for instability Cannot model instability with most conservative Stable >1.5 Minimum FS 1.5 Significant destabilizing factors are required for instability parameters specified Table 1. Stability class definitions for stability index map delineated using SINMAP. Modified from Pack and others (1998, Table 1). 19. Using the provided maps for Buncombe County, NC, what is common to the areas mapped as "Stable"? What is the minimum Factor of Safety to be considered "Stable"? <50% 10040014 CLARION

Use the below Landslide Hazard maps from Buncombe county NC to answer questions 19 and 20. STABILITY INDEX MAP OF BUNCOMBE COUNTY, NORTH CAROLINA FILTRAT HERENTESEPTI Possible Influence of Map Color Predicted Stability Code Zone Relative Debris/Earth Flow Slide Hazard Ranking Stability Index Range Factor of Safety Probability of Predicted Stability with Parameter Ranges Used in Analysis (FS) Instability Stabilizing or Destabilizing Factors Unstable 0 Maximum FS <1 100% Kange cannot model stability Stabilizing factors required for stability High Upper Threshold of Instability 0-0.5 >50% of FS 1 Optimistic half of range required for stability Stabilizing factors may be responsible for stability Lower Threshold of Instability Moderate 05-1 >50% of FS >1 Pessimistic half of range required for instability Destabilizing factors are not required for instability Cannot model instability with most conservative Nominally Stable 1-1.25 Minimum FS = l Minor destabilizing factors could lead to instability parameters specified Moderately Stable Low 1.25-1.5 Minimum PS= 1.25 Cannot model instability with most conservative parameters specified Moderate destabilizing factors are required for instability Cannot model instability with most conservative Stable >1.5 Minimum FS 1.5 Significant destabilizing factors are required for instability parameters specified Table 1. Stability class definitions for stability index map delineated using SINMAP. Modified from Pack and others (1998, Table 1). 19. Using the provided maps for Buncombe County, NC, what is common to the areas mapped as "Stable"? What is the minimum Factor of Safety to be considered "Stable"? <50% 10040014 CLARION

Applications and Investigations in Earth Science (9th Edition)
Applications and Investigations in Earth Science (9th Edition)
9th Edition
ISBN:9780134746241
Author:Edward J. Tarbuck, Frederick K. Lutgens, Dennis G. Tasa
Publisher:Edward J. Tarbuck, Frederick K. Lutgens, Dennis G. Tasa
Chapter1: The Study Of Minerals
Section: Chapter Questions
Problem 1LR
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Use the below Landslide Hazard maps from Buncombe county NC to answer questions 19 and 20. STABILITY INDEX MAP OF BUNCOMBE COUNTY, NORTH CAROLINA Map Color Predicted Stability Code Relative Debris/Earth Flow Slide Hazard Ranking Stability Index Range Factor of Safety (FS)³ Probability of Instability Predicted Stability With Parameter Ranges Used in Analysis Possible Influence of Stabilizing or Destabilizing Factors Zone Unstable 0 Maximum FS <1 100% Range cannot model stability Stabilizing factors required for stability High Upper Threshold of Instability 0-05 >50% of FS <1 >50% Optimistic half of range required for stability Stabilizing factors may be responsible for stability Lower Threshold of Instability Moderate >50% of FS >1 <50% Pessimistic half of range required for instability Destabilizing factors are not required for instability Cannot model instability with most conservative Nominally Stable 1-1.25 Minimum FS=1 Minor destabilizing factors could lead to instability parameters specified Moderately Stable Low Cannot model instability with most conservative 1.25-1.5 Minimum PS= 1.25 Moderate destabilizing factors are required for instability parameters specified Cannot model instability with most conservative parameters specified Stable >1.5 Minimum FS=1.5 Significant destabilizing factors are required for instability Table 1. Stability class definitions for stability index map delineated using SINMAP. Modified from Pack and others (1998, Table 1). 19. Using the provided maps for Buncombe County, NC, what is common to the areas mapped as "Stable"? What is the minimum Factor of Safety to be considered "Stable"? 20. Have there been previous slope failures in Buncombe County? How do we know? What is the most common type of mass wasting event to occur in the SW portion of the county?
Transcribed Image Text:Use the below Landslide Hazard maps from Buncombe county NC to answer questions 19 and 20. STABILITY INDEX MAP OF BUNCOMBE COUNTY, NORTH CAROLINA Map Color Predicted Stability Code Relative Debris/Earth Flow Slide Hazard Ranking Stability Index Range Factor of Safety (FS)³ Probability of Instability Predicted Stability With Parameter Ranges Used in Analysis Possible Influence of Stabilizing or Destabilizing Factors Zone Unstable 0 Maximum FS <1 100% Range cannot model stability Stabilizing factors required for stability High Upper Threshold of Instability 0-05 >50% of FS <1 >50% Optimistic half of range required for stability Stabilizing factors may be responsible for stability Lower Threshold of Instability Moderate >50% of FS >1 <50% Pessimistic half of range required for instability Destabilizing factors are not required for instability Cannot model instability with most conservative Nominally Stable 1-1.25 Minimum FS=1 Minor destabilizing factors could lead to instability parameters specified Moderately Stable Low Cannot model instability with most conservative 1.25-1.5 Minimum PS= 1.25 Moderate destabilizing factors are required for instability parameters specified Cannot model instability with most conservative parameters specified Stable >1.5 Minimum FS=1.5 Significant destabilizing factors are required for instability Table 1. Stability class definitions for stability index map delineated using SINMAP. Modified from Pack and others (1998, Table 1). 19. Using the provided maps for Buncombe County, NC, what is common to the areas mapped as "Stable"? What is the minimum Factor of Safety to be considered "Stable"? 20. Have there been previous slope failures in Buncombe County? How do we know? What is the most common type of mass wasting event to occur in the SW portion of the county?
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