How was the Sierra Nevada formed by faulting and uplift?

The Sierra Nevada is geologically characterized as an upfaulted, tilted block of the Earth’s crust. Its formation is primarily defined by a major fault zone located along its eastern boundary.1

Through this faulting process, the massive block that constitutes the range was uplifted and tilted toward the west, which accounts for the range's distinct asymmetry. While this massive uplift began millions of years ago, a significant portion of the elevation occurred within the last two million years. This tectonic activity is linked to the broader crustal extension of the region; specifically, the movement along the eastern fault has allowed adjacent areas, such as the Owens Valley, to drop relative to the mountain range, further emphasizing the height of the Sierra Nevada.123

As the block rose, the steep eastern escarpment was subjected to intense erosion from wind, rain, ice, and temperature changes, resulting in the development of deep canyons, while the western flank features a more gradual slope.1