July 13, 2012
Plate Tectonics Press Release
Hello everyone, my name is John doe and I am the Director of Earthquake Preparedness’ for Los Angles. I am here today to talk to your about earthquake preparedness. During this press release I will be describing the hazards associated with earthquakes in Los Angeles. I will discuss the origin and causes of earthquakes and the relation of earthquakes to plate tectonics and faults in Los Angeles. Historical disasters associated with past earthquakes and potential earthquakes in the future. Earthquakes are caused when tension is released from the rocks in the Earth’s crust and upper mantle. This tension is due to friction between what scientists believe are large plates floating on magma on the Earth’s surface. Sometimes earthquakes happen when the rocks in the Earth’s crust bend and break. This causes shock waves to travel on the Earth’s surface, resulting in widespread destruction. Earthquakes usually occur in places where two plates meet, called faults, like here in the Los Angeles area. Earthquakes are mostly generated deep within the earth’s crust, when the pressure between two plates is too great for them to be held in place. The underground rocks then snap, sending shock waves out in all directions, which are called seismic waves. The greatest Southern California earthquake in modern history was the Fort Tejon Earthquake on January 9, 1857 that measured 8.0 on the Richter scale. Damages were not nearly as serious as it would be today, mostly because Southern California was sparsely populated. The effects of the earthquake were quite dramatic, even frightening. Were the Fort Tejon shock to happen today, the damage would easily run into billions of dollars, and the loss of life would be substantial. On March 10, 1933, a 6.4 earthquake hit the Newport-Inglewood Fault, causing serious damage in long Beach and other communities. The earthquake resulted...