I don't know about that event causing magnetic disturbances, but I think the are filling Poplar Island with dredge sediment (when they dredge channels) and I would guess that the sediment contains varying amounts of magnetic deposits... I remember the old Poplar Island back in the 70s as a wonderful place to anchor with a shallow draft boat.
Sailing on The Central Chesapeake Bay, West River, MD on my Catalina 27, Aelous II with my wife and friends.
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