South Bay residents felt some shaking Tuesday afternoon, however the exact cause is unknown. The U.S. Geological Survey confirmed that what South Bay residents felt was not an earthquake. “Our duty seismologist did an extensive

search and we did not see any seismic activity in the South Bay,” Susan Garcia, a spokeswoman with the U.S. Geological Survey, said to SFGATE. “So it’s not an earthquake, whatever they’re feeling — as far as we can tell.” Despite that, many local residents did report on Twitter that a rumbling of some sort was felt at about 2:45 p.m. CONTINUE