Petra...I used to work with Mark Legg and still give him a call now and then....we could do something useful concerning the activity of Palos Verdes anticlinorium and some of the faults...but funding is so difficult that it does not make sense right now for us to go after funding together. A 7.6 under Catalina Island could cause a lot of damage under Long Beach and even under downtown LA because the deep sedimentary LA basin would amplify the ground motion. 40 km is nothing as far as attenuating a tsunami...it can be a lot for attenuating ground motion but the Loma Prieta quake was farther from Oakland, and was a much smaller quake. the question is whether the faults responsible for uplift of Catalina Island and the waters around it are capable of a quake as large a M7.6.......sounds a little large.

OK: the Island that is much closer is Palos Verdes uplift....it would be an island except it is drowned in sediment. If you strip off the water, and strip off the sediment younger than 5 million years, it is a large feature. I've posted on this structure quite a lot the last few months...

Chris