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Teleseismic, or distant, earthquakes regularly disrupt the operation ofground--based gravitational wave detectors such as Advanced LIGO. Here, wepresent \emph{EQ mode}, a new global control scheme, consisting of an automatedsequence of optimized control filters that reduces and coordinates the motionof the seismic isolation platforms during earthquakes. This, in turn,suppresses the differential motion of the interferometer arms with respect toone another, resulting in a reduction of DARM signal at frequencies below100\,mHz. Our method greatly improved the interferometers' capability to remainoperational during earthquakes, with ground velocities up to 3.9\,$\mu\mbox{m/s}$ rms in the beam direction, setting a new record for both detectors.This sets a milestone in seismic controls of the Advanced LIGO detectors'ability to manage high ground motion induced by earthquakes, opening a path forfurther robust operation in other extreme environmental conditions.

Improving the Robustness of the Advanced LIGO Detectors to Earthquakes