A couple of HAM triple suspensions tripped this morning, while the 6.5 eq off of Vancouver island was rolling by. Looking at trends for SRM, M3 tripped because the ISI tripped and cause the optic to saturate the M3 osems.  The ISI trip happened after the peak of the ground motion, when some of the CPS saturated, due to the large low frequency motion. I think we could have avoided this by switching to higher blends, when SEI_ENV went to it's LARGE_EQ state. TJ added this to the guardian, but it looks like HAM7 and HAM8 might not be stable with those blends. I'll have to do some measurements on those two chambers to see what is causing those blends to be unstable, when I have time.

First attached trend are a short wind around the time of the ISI trip. The M3 osems don't see much motion until the ISI trips on the CPS,  and SRM doesn't trip until a bit later, when the ISI starts saturating GS13s because of the trip.

Second image shows the full timeline. The middle row shows the peak of the earthquake has more or less passed, but the ISI CPS are still moving quite a lot. The GS13 on the bottom row doesn't saturate until after the ISI trips on the CPS.