Abstract

During summer of 2016 an event was register in the volcanic lake of Santa María del Oro, a perturbation that triggers a considerable rise of amplitude on the lake system for at least two days. Due to the scarce observations in the lake, yet it is not definitive what event took place, a storm, a landslide or other. Based on numerical modelling a series of experiments were carry out in order to determine the kind of forcing that created those anomalies. This study is focused in characterizing a submarine landslide and the effects of the wind valley breeze. The results indicate that the lake acts as a dynamical membrane resonating to frequencies at 3.2 min (external seiche) and in a band of the 2-8 hrs (internal seiches) with the 2.64 hrs the most intense. After every forcing the water starts to oscillate uniformly and in a clockwise sense until the energy is dissipated by friction at the internal seiches frequencies.