This was an obvious & quick lockloss due to a 5.2 EQ in Mexico (looks like it took down L1 about 10min before H1).  Here in the control room:

• 1732 Incoming EQ alert on verbal
  • First seen on 1 of the Picket Fence traces as a yellow and then orange and red.
• 1733 Seismon activated
• 1734 LOCKLOSS & Observatory Mode marked for EARTHQUAKE
• On FOM of seismic signals velocity of ground motion went up above 1um/s very fast, but it is also dropping pretty fast.  So might try to relock at/before 1800utc.
• Willl hold here for a little bit and monitor seismic signals and will return to locking when the ground quiets.