Quake hits Mojave Desert in Southern California

A moderate earthquake struck a sparsely populated area of California's Mojave Desert on Friday night.
The shaking was felt from Southern California to the fringes of Nevada and Arizona, but there were no immediate reports of damage.
The 5.1-magnitude temblor struck just outside Ludlow on Interstate 40 in San Bernardino County, about 120 miles east of Los Angeles, the U.S. Geological Survey said.
The initial reports measured the quake at 5.5-magnitude.

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OK, I give up. Just what constitutes a major earthquake and what constitutes a moderate earthquake and is there such thing as a mild earthquake? An earthquake is an earthquake people. The ground moves and it normally doesn't do that! And from where I sit, the ground moving isn't the best thing to happen since sliced bread.