Analog model of subduction engine

Analog modeling initiates scientific reflection: what triggers the descent? What is the critical angle? What is the role of lithosphere density? Students grasp different aspects of subduction through a series of simple experiments that allow for a more comprehensive view of the geological phenomenon: - convergence system - oceanic opening - variation in density of the oceanic plate - role of relative densities of the asthenosphere and lithosphere The experimental approach is determined according to the parameters and context chosen by the students. Principle of subduction: Subduction is simulated by the descent of a flexible strip (oceanic lithosphere) into a viscous liquid (the asthenosphere). A specific study on the density ratio of the viscous agent and the elastomer was carried out to achieve a realistic simulation in just a few seconds. During a single session, the number of experiments can be multiplied to test different hypotheses. The "oceanic" strips have a deliberately studied profile to guide the distribution of weight descent. The continental lithosphere is simulated by a thicker but less dense elastomer block. The density of the asthenosphere can also be adjusted by modifying the concentration of the viscous agent.

The kit consists of:
- 3 flexible elastomeric bands (oceanic lithosphere)
- 1 self-adhesive ballast band
- 1 rigid block (continental lithosphere)
- 1 lifting wire
- 1 narrow tank dimensions (L x h x l): 43 x 20 x 7 cm
- 3L of viscous solution