Although vacuum brake boosters are almost ubiquitous, some vehicles use hydraulic brake boosters, which are powered by hydraulic pressure instead of vacuum. This pressure is provided by a drive belt-driven pump and may be tied into a hydraulic power steering system.
Unity Station. The exterior of Unity Station in Los Santos, San Andreas. Unity Station is a railway station in Grand Theft Auto: San Andreas located along the Brown Streak Railroad line in San Andreas.
The San Andreas is a strike-slip fault, meaning that the edges of two tectonic plates are rubbing against each other. There are trying to slide against each other, but friction keeps them in place. When pressure builds to a point it overcomes friction, you have a 'slip', an earthquake.