@article{fdi:010066656,
  title = {{D}ynamic implications of ridges on a debris avalanche deposit at {T}utupaca volcano (southern {P}eru)},
  author = {{V}alderrama, {P}. and {R}oche, {O}livier and {S}amaniego, {P}ablo and de {V}ries, {B}. {V}. and {B}ernard, {K}. and {M}arino, {J}.},
  editor = {},
  language = {{ENG}},
  abstract = {{C}atastrophic volcanic landslides can involve different parts of a volcano that can be incorporated into any resulting debris avalanche. {T}he different material properties may influence the mechanical behaviour and, hence, the emplacement mechanisms of the different avalanche units. {W}e present data from a coupled hydrothermal-and magmatic-related volcanic landslide at {T}utupaca volcano ({P}eru). {A}round {AD} 1802, the hydrothermal system under {T}utupaca's growing dacite dome failed, creating a debris avalanche that triggered a large explosive eruption. {A} typical debris avalanche hummocky unit is found, formed out of rock from the dome foot and the underlying hydrothermally altered lavas. {I}t is covered by a more widespread and remarkable deposit that contains remnants of the hot dome core and the inner hydrothermal material. {T}his deposit has ridges 20-500-m long, 10-30-m wide and 1-5-m high, regularly spaced and that fan slightly outward. {C}ross sections exposed within the ridges reveal coarser cores and finer troughs, suggesting grain size segregation during emplacement. {R}idge morphology and granulometry are consistent with fingering known to occur in granular flows. {T}he ridges are also associated with large blocks that have evidence of differential movement compared with the rest of the flowing mass. {T}he presence of both ridged and hummocky deposits in the same event shows that, as different lithologies combine and collapse sequentially, materials with different mechanical properties can coexist in one landslide, leading to contrasting emplacement dynamics. {T}he different structures thus highlight the complexity of such hazardous volcanic events and show the difficulty we face with modelling them.},
  keywords = {{T}utupaca volcano ; {D}ebris avalanche ; {F}lank collapse ; {R}idges ; {G}ranular fingering ; {PEROU}},
  booktitle = {},
  journal = {{B}ulletin of {V}olcanology},
  volume = {78},
  numero = {2},
  pages = {14},
  ISSN = {0258-8900},
  year = {2016},
  DOI = {10.1007/s00445-016-1011-x},
  URL = {https://www.documentation.ird.fr/hor/fdi:010066656},
}