A 7.1-magnitude earthquake rocked communities near the Mojave Desert on Friday, one day after a 6.4-magnitude quake there.<br />According to CNN, aftershocks have occurred an average of once a minute since Friday night.<br />The United States Geological Survey warned that another earthquake of a similar magnitude could strike within the next week.<br />There's a looming danger of one along the imposing San Andreas fault zone to the west, which could cause significantly more damage.<br />Fault lines occur where rocks on two sides push against or slide past each other, displacing the earth's crust. <br />
