  We prove an "Earthquake Theorem" for hyperbolic metrics with geodesic
boundary on a compact surfaces $S$ with boundary: given two hyperbolic metrics
with geodesic boundary on a surface with $k$ boundary components, there are
$2^k$ right earthquakes transforming the first in the second. An alternative
formulation arises by introducing the enhanced Teichmueller space of S: We
prove that any two points of the latter are related by a unique right
earthquake. The proof rests on the geometry of ``multi-black holes'', which are
3-dimensional anti-de Sitter manifolds, topologically the product of a surface
with boundary by an interval.
