Thursday saw the fourth tremor in as many days to hit California’s Bay Area. The 3.6 quake hit the Berkeley area at 5:30am. Unsettling as the quakes were, geologists have even more disturbing news for Bay Area residents: they say the quakes were much too small to relieve the seismic pressures that have been building along the Hayward Fault since the last Big One hit the area in 1868. Studies show that the Big Ones hit the area at regular intervals of about 160 years — meaning another Big One is coming.