Graben sector slipping hypothesis on the north-east part of the Las Canadas caldera (Teide, Tenerife, Spain) - Geophysical and morphological aspects

The las Canadas caldera is a 15 km broad depression. Its origin is always discussed: (i) collapsing, (ii) graben sector slipping, (iii) erosion. The present contribution concerns the knowledge of the upper filling in relation to the internal structure of the caldera. Under certain conditions, Self-Potential measurements CSP method) allow us to calculate a two-layer model; the first one being the unsaturated zone overlapping the second, saturated zone or impermeable substratum. From these measurements, we suggest the possibility of a collapsing process in the southern part of the the caldera, but graben sector slipping in the northern-east zone. (C) Academie des sciences /Elsevier, Paris.