When parts of the upper mantle collide with each other, the force causes changes on the surface like volcanoes and fractures the collision not impact the asthenosphere because asthenosphere is the plastic and brittle
The asthenosphere is the unique to our planet and earth is the only planet in the solar system with an asthenosphere and if planet doesn't have water this means it doesn't have an asthenosphere and the asthenosphere play an important role in plate tectonic movement and asthenosphere is situated underneath the solid lithosphere and the asthenosphere is ductile and deform easily compared to the overlying lithosphere so the collision not impact the asthenosphere because asthenosphere is the plastic and brittle
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