Item talk:Q270765

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   "@type": "Article",
   "additionalType": "Journal Article",
   "name": "Vadose zone thickness limits pore-fluid pressures and acceleration in a large, slow-moving landslide",
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       "value": "10.1029/2021JF006415",
       "url": "https://doi.org/10.1029/2021JF006415"
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   "journal": {
     "@type": "Periodical",
     "name": "Journal of Geophysical Research: Earth Surface",
     "volumeNumber": "127",
     "issueNumber": "6"
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   "inLanguage": "en",
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   "datePublished": "2022",
   "dateModified": "2022-09-07",
   "abstract": "The rate and timing of hydrologically forced landslides is a complex function of precipitation patterns, material properties, topography, and groundwater hydrology. In the simplest form, however, slopes fail when subsurface pore pressure grows large enough to exceed the Mohr-Coulomb failure criterion. The capacity for pore pressure rise in a landslide is determined in part by the thickness of the unsaturated zone above the water table, which itself is set by weathering patterns that should have predictable patterns across different lithologies. To investigate how this structure affects landslide behavior, we exploit a multi-year record of precipitation, pore pressure, and velocity from Oak Ridge earthflow, a slow-moving landslide set in Franciscan m\u00e9lange, northern California, USA. In conjunction with electrical resistivity tomography and hydraulic conductivity measurements, these data show that Oak Ridge has a thin weathered profile that is comparable in thickness to other m\u00e9lange landslides in California. We propose that due to the inherently thin vadose zone, m\u00e9lange landscapes experience an unusually high water table that frequently brings them close to movement; however, the capacity to increase stress is limited by the small amount of dynamic storage available. Instead, excess pore pressure is shed via springs and saturation overland flow once the water table reaches the surface. Linkages between weathering patterns, hydrology, and deformation can explain behavior patterns exhibited by Franciscan m\u00e9lange earthflows across a large precipitation gradient.",
   "description": "e2021JF006415, 20 p.",
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       "name": "Murphy, C.R.",
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           "name": "Pacific Coastal and Marine Science Center",
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