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Los Angeles City Hall Seismic Rehabilitation Project - What are Dampers and sliders?
Dampers and sliders are assist the isolators in dampening the impact of an earthquake on the building, by fine tuning selected areas of the building.
Dampers are similar to the shock absorbers used in automobiles. They lessen the initial jolt or thrust of an earthquake. There are 52 viscous dampers installed in the basement and 12 in the tower.
Sliders are a special type of isolator that "fine tunes" the isolator - damper system for optimal results.
Above: A mounted damper in the
ceiling of the 26th floor.
Some of the 52 dampers installed
in the sub basement
    Slider installed beneath the north
    entrance stairwell.
    A close up of another damper on
    the 26th floor.