Seismic methods image anomalies at locations of present and past subduction in upper and lower mantle. These correlate quite well with the history of subduction extending back to 200 Myr ago, if lower ...

Construction joints are formed or placed into slabs to define stopping places or the extent of an individual concrete placement. There are different types of construction joints: butt-type with and ...

The Isabella anomaly -- the seismic signal of a large mass of cool, dehydrated material about 100 kilometers beneath central California -- is in fact a surviving slab of the Farallon oceanic plate, ...