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USGS CMG InfoBank: Evaluating Landslide Risks

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Comment: 20:46 - 21:52 (01:06)
Source: Annenberg/CPB Resources - Earth Revealed - 1. Down to Earth
Keywords: landslide, "landslide risk", drilling, "Ann Meeker"

Our transcription: When new construction is planned for areas with slopes, geologists are often called upon to evaluate potential landslide risk.
First, the proposed building site is mapped.
Next, drilling is done to give the geologists a direct view of the subsurface structure at the site.
Along with soil samples obtained during the drilling process, this provides much needed data about the history of landslide activity in the area.
As we drill the hole in that area, we will be sampling the material to determine how strong it is.
We will also be describing it in terms of its soil characteristic, such as grain size, moisture, color, a variety of types of characteristics, which will be useful to the engineers in the office when they determine whether or not the material will be suitable to stand in a slope or to be reused as fill somewhere else on the site.

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