Timeline: The emergence of Isis. 1  1/40 2000 Abu Musab al-Zarqawi (pictured here) forms an al-Qaeda splinter group in Iraq, al-Qaâeda in Iraq. Its brutality from the beginning alienates Iraqis and many al-Qaeda leaders. 2  2/40 2006 Al-Zarqawi is killed in a U.S. strike.
Subduction zone earthquake. The area where the earthquake occurred is a subduction zone where the Pacific Plate is subducting beneath the North American Plate. The crust of southern Alaska was compressed and warped due to plate movement prior to the great earthquake after the plates locked together.Crustal plate movement.he area where the earthquake occurred is a subduction zone where the Pacific Plate is subducting beneath the North American Plate. The crust of southern Alaska was compressed and warped due to plate movement prior to the great earthquake after the plates locked together. Crustal plate movement.
As it has already been explained new crust is formed in zones of spreading. Since this crustal for mation is a continuous process, the new crust pushes the earlier ones from the ridge crest and causes spreading of the lithosÂ­pheric plate. This process is believed to cause plate motion. 2. Oceanic-topography. As the mid-oceanic ridges, from where new lithospheric plates originate, are normally 2 to 4 kms above the level of the ocean floor and slope away more or less symmetrically from the crest, it is thought to be responsible for plate motion. 3. Rate of Motion