faulting

Left: The recovered sample. The red dash lines represent faults. Center: The fault filled with nano-crystalline olivine and wadsleyite. Right: A close-up view of the fault gouge. Iron-rich particles (a product of partial melting of olivine: green) are distributed along the grain boundaries of nano-crystalline olivine. Credit: Tomohiro Ohuchi, Ehime University Earthquakes which occur at depths of several hundred kilometers in…