The main explanation of this fault line type means the rocks will move horizontally to the fault line. That explains the way the seismic waves will go; the seismic waves went horizontal to the San Andreas Fault line, which resulted in the earthquake hitting San Francisco. The focus mechanism is basically the same descriptive as the type of faulting. The focus mechanism is that the two plates slide past each other rubbing against each other. A visional reprehensive of this description is located at the end of this document. There was a lot of stress that was built up and released that resulted to the earthquake. Due to the Oceanic plate slipping under the continental plate, there is a ton of tension that was built up because the oceanic cannot smoothly go under the continental plate, the oceanic plate is rocky so it gets stuck easily while trying to move under the other plate. Imagine two convoy-belts moving, one moves under the other and they touch at the point the one sinks under the other. If they are smooth and lubricated they can easily move pass each other without getting stuck. But, if there is fifty rocks glued to the one going under the other, clearly it would cause distress to the machine, and cause it to get stuck. Now imagine the worker that usually controls this machine is not there to stop the machine it will keep trying to move, so there is a ton of energy built up, and then sometimes it will be able to pass a rock, but due to all that tension built up it will violently move pass the rock. That is exactly how the oceanic plate and the continental plate move, since they are so rocky and gravity does not stop, when the tension is released it causes violent earthquakes that destroy towns with no mercy. Even though, the 1906 earthquake was a century and a decade ago, all of this is still relevant to this day. Not only, was the stress present back in 1906 but, it is still present today
The main explanation of this fault line type means the rocks will move horizontally to the fault line. That explains the way the seismic waves will go; the seismic waves went horizontal to the San Andreas Fault line, which resulted in the earthquake hitting San Francisco. The focus mechanism is basically the same descriptive as the type of faulting. The focus mechanism is that the two plates slide past each other rubbing against each other. A visional reprehensive of this description is located at the end of this document. There was a lot of stress that was built up and released that resulted to the earthquake. Due to the Oceanic plate slipping under the continental plate, there is a ton of tension that was built up because the oceanic cannot smoothly go under the continental plate, the oceanic plate is rocky so it gets stuck easily while trying to move under the other plate. Imagine two convoy-belts moving, one moves under the other and they touch at the point the one sinks under the other. If they are smooth and lubricated they can easily move pass each other without getting stuck. But, if there is fifty rocks glued to the one going under the other, clearly it would cause distress to the machine, and cause it to get stuck. Now imagine the worker that usually controls this machine is not there to stop the machine it will keep trying to move, so there is a ton of energy built up, and then sometimes it will be able to pass a rock, but due to all that tension built up it will violently move pass the rock. That is exactly how the oceanic plate and the continental plate move, since they are so rocky and gravity does not stop, when the tension is released it causes violent earthquakes that destroy towns with no mercy. Even though, the 1906 earthquake was a century and a decade ago, all of this is still relevant to this day. Not only, was the stress present back in 1906 but, it is still present today