Yes but what is drastically? Is it a sudden rise of 328ft in say a year. Now that would be a drastic, in geological terms, event. See
http://en.wikipedia.org/wiki/Surtsey but even then that took nearly 4 years to finish building and the sesmic activity was recorded around the world.
Look it is physically impossible for the earth/crust/mantle to jump 328ft without a record of sesmic activity taking place in the area of the supposed rise. The Earths crust isn't a zit that suddenly erupts into a 328ft pimple overnight. The recording device is faulty.