Understanding debris flow initiation by examining the granular origins of complex rheology: An example from the 2018 Montecito mudslides

Hadis Matinpour1, Sarah Haber2, Robert Henry Fetell3, Paulo Arratia4, Douglas J Jerolmack3 and Thomas Dunne5, (1)University of California Santa Barbara, Santa Barbara, CA, United States, (2)University of Pennsylvania, University of Pennsylvania, Philadelphia, United States, (3)University of Pennsylvania, Department of Earth & Environmental Science, Philadelphia, PA, United States, (4)University of Pennsylvania, Philadelphia, United States, (5)Univ California Santa Barbara, Santa Barbara, CA, United States