riporto i commenti dell'autore del video


Brian O’Connell, a Senior Geoenvironmental Engineer at Cornwall Council

"My thoughts are is that it’s a progressive failure, but would welcome some comments. I appreciate the footage is a little grainy, so I’ll try to through a little more light… As I note in the description, there were a number of failures which increased in size and volume until the cliff collapsed. The cliff is formed from Devonian metasediments – turbidite sequences of mudstone, siltstone and fine grained sandstone. There are normally 5 discontinuity sets of varying persistence (I wasn’t prepared to go and measure them!); observations of a nearby cove indicates unfavourable joint failure which could lead to planar failure. Prior to the failure there were a number of tension cracks approximately 30 m in-land which had been steadily growing in size over the previous 4 days. However the way the failure presented itself, with material spalling-off mostly in the lower third of the slope, opening of large tension cracks within mid to upper section of the cliff face and the ‘sagging’ off the slope geometry as it failed, does seem to indicate a progressive failure?"

michele conti
fatti non foste per viver come bruti ma per seguir virtute e conoscenza