| Sete Cidades is an active central volcano with a summit caldera located in
the westernmost part of S. Miguel Island (Azores). Since the settlement of
the Island, in the 15th century, many landslide events occurred in this
volcano, causing extensive damages in buildings and infrastructures. The
study of historical records and the observation of new occurrences showed
that landslides in the region have been triggered by heavy rainfall periods,
earthquakes and erosion.
In order to assess landslide susceptibility at Sete Cidades Volcano,
landslide scars and associated deposits were mapped through aerial
photographs and field surveys. The obtained data were inserted in a GIS to
produce a landslide distribution map. It was concluded that the high density
landslide areas are related with (1) major scarp faults, (2) the margin of
fluvial channels, (3) the sea cliffs and (4) volcanic landforms, namely the
caldera wall. About 73% of the mapped events took place in areas where
pyroclastic deposits are the dominant lithology and more than 77%
occurred where slopes are equal or higher than 20°. These two
parameters were integrated and used to generate a preliminary susceptibility
map.
The incorporation of vulnerability data into the GIS allowed concluding that
30% of dwellings and most of the roads on Sete Cidades Volcano are
located in areas where landslide susceptibility is high to very high. Such
conclusion should be taken into account for emergency and land use planning. |