Its prime feature is an observatory in Parkfield, Calif., which has placed instruments nearly two miles deep into the Earth right up against the San Andreas fault to record every creep, rattle,grind.

• 其显著特色是设在加州帕克菲尔德市的一个观测站，它在圣安德列亚斯断层的正上方距地表近两英里处，安装了各种仪器，用来记录这里的每一次地壳移动、撞击和摩擦。