Azufral volcano is an active composite volcano located in SW Colombia, whose edifice is mostly formed by pyroclastic deposits and lava flows. Recent road works in the region, NE of the volcano, revealed unknown deposits, one of them related to a debris avalanche event. This deposit, herein named San Roque debris avalanche deposit, outcrops along a 13 km section in the road Túquerres - Samaniego. Using this long exposure, the deposit was studied through sedimentological, grain size, microtextural and mineralogical analyses. The deposit is massive, varicolored, poorly sorted, with a predominance of gravel and sand-sized clasts; it contains angular megaclasts some of them with jigsaw cracks, and exhibits injections, faults, and horsts-and-graben structures. Surface microtextures in some clasts evidence collisions and shearing interactions among them, while mineralogy evidences the collapsed material involved in the avalanche. Based on stratigraphic relationships, the collapse is bracketed between 0.58 Ma and ∼18 ka. The San Roque debris avalanche deposit covers an area of 56.01 km², has an estimated volume of 0.51 km³, an approximated runout of 11 km, and an apparent friction coefficient H/L of 0.109; these parameters are indicative of a large and very mobile flow. Its main transport mechanism responded to a dynamic disintegration of the larger clasts and a subsequent interaction by contact or collision (inertial-granular flow model), although some zones moved in a cushioned way remaining coherent over long distances (multi-shear model).

Azufral火山是位于哥伦比亚西南部的活性活火山，其建筑物主要由火山碎屑沉积物和熔岩流形成。火山东北部地区最近的道路工程揭示了未知的沉积物，其中之一与碎片雪崩事件有关。该矿床（这里称为San Roque碎片雪崩矿床）沿Túquerres-Samaniego公路13公里处露头。使用这种长时间的暴露，通过沉积学，粒度，微观结构和矿物学分析研究了该矿床。沉积物块状，多色，分类不良，以碎石和沙粒状碎屑为主。它包含有角状的碎裂碎屑，其中一些带有拼图裂纹，并表现出注入，断层和霍斯特-格拉本结构。在某些碎片中，表面微观纹理证明了它们之间的碰撞和剪切相互作用，而矿物学则证明崩塌的物质与雪崩有关。根据地层关系，塌陷在0.58 Ma和〜18 ka之间。圣罗克残骸雪崩矿床面积56.01公里²的估计体积为0.51 km ³，近似跳动为11 km，表观摩擦系数H / L为0.109；这些参数表示流量很大且非常移动。它的主要运输机制响应较大碎屑的动态崩解和随后的接触或碰撞相互作用（惯性颗粒流动模型），尽管某些区域以缓冲的方式运动，在长距离上保持连贯性（多剪切模型）。