Aware of this correspondence, Alfred Anderson of the University of Chicago and his colleagues studied the size of the bubbles under a microscope to estimate how long it took the magma to leak out.

• 了解到气泡与岩浆库的一致性，芝加哥大学的安德森和研究同仁，便利用显微镜来研究气泡的大小，以估计岩浆的渗出花了多少时间。