From the Entire Globe to a Single Volcano

Slide 4 of 24

Notes:

Many new discoveries in recent years with these mapping tools, particularly on seafloor spreading centers or Mid-ocean ridges (MORs)

Mid-ocean ridges:

Account for ~70% of global volcanism

3 cubic kilometers of new crust produced per year

3 cubic kilometers is enough to pave entire U.S. interstate highway system to height of 6 feet!!

“Segmentation” is another major discovery - the mid-ocean ridge is not uniform in linearity as first though - mapping has shown us that it is segmented, some portions being swollen with magma, others starved of magma - delivery of magma from mantle is not