Plates are pushed towards each other. The denser plate gets forced to under the plate. Energy builds up in the subduction zone due to . This is sometimes released as an . As it continues to subduct, the friction also leads to partial melting. The molten rock rises up through until it reaches the surface.

Seismic waves are generated by an earthquake. waves are felt first - they are relatively weak but warn us of the worst to come. waves are stronger and travel at right angles to the direction of the wave. waves are the final waves. There are two types: and (which cause most damage)

There were many responses to the L'Aquila earthquake. Immediate responses included the injured taken to hospital, tent settlements to house out of the homeless and volunteers searching for survivors. Long term responses included an into why buildings collapsed and, afterwards, building regulations were strictly enforced. Overall, was poured into L'Aquila.

There were many effects of the Haiti earthquake. Some primary effects included people dead, many by the % of buildings that collapsed. Such buildings included the building and the police HQ. Secondary effects included homeless and, effectively, no law and order. This was due to the main prison in Port Au Prince being destroyed as well as the death of many and government officials.

The magnitude earthquake of Haiti had many responses. Immediate responses included UN troops sent to restore law and order. They also set up a '' to feed people. Nearly make shift camps set up to house the homeless. Long term cake included the '' - a n reconstruction package, especially in . These reconstructions will be built to '' building codes.