JeffB reported the ITMX was found tripped this morning.  Pretty clearly it was the arrival of the S-waves ; the platform is already tripped when the largest amplitude, lower frequency surface waves arrive later.  The attached trend clearly shows the sharp peaks arriving at the ground STS in the Bier Garten at the moment the Watchdog State goes high.  Why the ITMX is the platform that is most sensitive is an ongoing investigation.  The earliest arrive P-Wave should be largely vertical (Z) where the next arriving S-Waves will be horizontal. A Clue!!