Landslide inventory mapping for calculating potential lahar volume for Canton Buenos Aires on Ilamatepec (Santa Ana) Volcano, Santa Ana, El Salvador

Abstract

Landslides in volcanic terrain are common and one of the main sources for material for lahars during times of non-volcanic activity periods. When this information is Nnown and recorded can be used for the creation of lahar hazard maps. However, in volcanoes where there is little or no data this information needs to be obtained in a different way. This paper proposes the creation of landslide inventories using satellite images and Geographic Information Systems (GIS) and field recognizance to applied the power law equation which uses landslide area and volume to feed and empirical relationship. For this purpose, this papers looNs at the Volcan Santa Ana also Nnown as Ilamatepec Volcano in Santa Ana, El Salvador, where very little data on lahars and landslides have been recorded. However, it is an area where these processes occur on a regular basis. Two satellite images and GIS were used for the identification, georerencing and creation of the landslide inventory. In the field, 24 landslides were measure and used to estimate the potential total volume of material derived from all landslides. This volume can be then used to select lahar volumes that most closely.