Geologists suffer observatory glitchesFlagship experiment on the San Andreas fault has been troubled since last autumn.Richard MonasterskyDeep trouble: a drill rig or crane could fix SAFOD.EarthScopeAs US geophysicists gathered last week to celebrate EarthScope, one of their most ambitious programmes ever, researchers let slip an embarrassing fact that they had kept largely under wraps for 6 months. One major element of the project — a suite of instruments buried deep in California's San Andreas