<sod >This "perceived shaking" of this earthquake is said by the US Geological Survey to have been "severe" for about 15,000 residents at the very epicentre.< eod>< sod > An earthquake measuring 6.0 has struck California This "perceived shaking" of this earthquake is said by the USGS to have been "severe" for about 15,000 residents at the very epicentre.< eod>