This study performs the numerical simulation for the tsunami caused by the debris avalanche in Lake Nicaragua based on past events that occurred in the surroundings of Mombacho Volcano and the analysis of future scenarios of the debris avalanche in Conception Volcano. We used the Yanagisawa code for tsunami simulations and obtained arrival time and tsunami height. The model considered the volume, speed, distance, and width of the debris avalanche. We used the bathymetry and topography from the Nicaraguan Institute of Territorial Studies (INETER) for the simulation. A total of five simulations were modeled considering one simulation for Past Event and four simulations for Scenario Event. For these simulations, two directions of the debris avalanche in Conception Volcano, northeast and southwest, and two volumes such as maximum and minimum were considered. The worst impact was found in Rivas city when modeling the debris avalanche in the southwest direction with the maximum case in Conception Volcano. The arrival time of the tsunami was 10 minutes to the city, and the amplitude of the wave was from 4 m to 5.5 m. This case can be taken as an example to work on a tsunami disaster mitigation and evacuation plans.
Keywords: Tsunami in the lake, debris avalanche, Lake Nicaragua, volume, speed.