This could go on forever, speculation on what that was
. Actually, that is fault current caused by wires slapping together. Wherever the problem occurred, maybe a car hit a pole which caused the wires to slap together, the fault current is traveling back toward the source, probably a substation. You don't see that much in this country because most utilities have fault protection built into their systems which can sense a phase-to-phase or phase-to-ground fault, and it will drop power momentarily to allow the wires to settle down, then re-energize the lines. Doesn't look like they have that kind of equipment or it isn't working.