some of earth quake geologoly can be understood as blankets on a bed...
think of a nicely layered bed, with some sheets, and comforters, and some small afghans... they all move differently, the sheets slide better.. the small afghans might tend to lump more, and the comforter, which is several layers thick, has all the layers moving as one...
every time something moves in the bed, the different layers move (earthquakes.) the sheets can get wrinkled and lumpy, but the comfortor might not be as wrinkled.
and you can go under the covers (subductions,) that causes the sheets and all the other layers to rise up, (the coastal mountains of california, in all there different names)
you can lie on top of the covers, (and they get crushed, and wrinkled all the same... or you can push them diagonally... (when you get over heated, and twist the covers so you arms and sholders have a covers, but you legs are exposed..)
you can push the covers aside and bunch them up where india meet the main land of asia, the two continents are just bunching up and making the himalyas.. where as in california, one layer (say your body) is sliding under other layers (the covers) and at the same time raising the upper layer --
and finally, if say the bedframe or box spring cracked or broke ( a deep earth quake) there might be some wrinkles on the top of the bed, but not the same sort as if someone had slept in the bed... so deep earth quakes look different.
can you visualize the movements better now?
Whose Fault Is It?
