Article: article from journal or magazin.
Controls over landslide distribution in the White Mountains, New Hampshire
Debris avalanches and other mass wasting deposits are common geomorphic features in the White Mountains of New Hampshire. This study, based on air photo interpretation of 173 randomly selected slide scars, and supported by field observations and statistical analysis, examines the relative importance of lithology and geologic structure on slide occurrence, as well as the relationship between topography and slide morphology. Results indicate that the frequency of slide scars is significantly higher in sections underlain by metasedimentary lithologies than in areas dominated by plutonic rocks. The metasedimentary schist of the Littleton Formation is most susceptible to sliding, and directional analysis shows that the direction of foliation within this lithology corresponds strongly to slide aspect. Thus foliation and jointing within the bedrock can influence slide occurrence. This study also indicates that White Mountain landslides vary in type and form owing to the different processes that dominate in different topographic positions: high elevation ravine heads form rockslides and rockfalls, medium elevation forested slopes host debris avalanches, and stream-side slopes experience slumping activity. [Key words: mass movement, debris avalanches, landslides, White Mountains.]
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