As the process of faulting along the chain of the Apennine Mountains is a relatively recent one in geological terms , starting 500,000 years ago , the faults are more irregular .
More shaking occurs due to foreshocks according to seismologist Ross Stein from Stanford University .
As the process of faulting along the chain of the Apennine Mountains is a relatively recent one in geological terms , starting 500,000 years ago , the faults are more irregular , so more shaking occurs due to foreshocks according to seismologist Ross Stein from Stanford University .