Sumatra is the largest of its kind ever recorded . The 8.6 scale strike - slip earthquake has provided new insights for him . The quake was so large it extended beyond the Earth 's crust to the mantle . He said the earthquake has increased the stress on the rocks in the area .
Sumatra quake the largest of its type ever recorded . The 8.6 scale strike-slip earthquake has given new insights for seismologists . The quake was so large it extended beyond the Earth 's crust to the mantle . He said the quake has increased the stress on the plates in the area .