at 17:35 UTC today, work on the corner station infrasound mic, in the biergarten, close to the ITMY STS caused a corner station trip that included all BSC ISI and HEPI as well as all HAM ISIs (NOT HAM HEPIS). Some suspensions were tripped as well. It is believed that the heavy piece of equipment, replaced onto the ground in the PEM "stay clear" zone is what cause the spike.