Re: San Pedro Shelf
Posted by heartland chris on November 20, 2006 at 06:41:17:

Hello Canie...yes, the faults I am working are are responsible for keeping Palos Verdes Hills from sinking along with the basins that surround it. But, a restraining segment on the right-lateral Palos Verdes fault adds to that (Ward and Valensise, 1994)...so the shelves are just barely going up, and the Hills are going up at several tenths of a mm/yr. Global sea level has been going up faster...maybe 1 1/2 mm/yr, so if that had been going on for longer, the relative elevation of the hills would be sinking. Just this year, there have been some publications or at least presentations on Greenland ice sheet melting twice as fast as it was....but that might just be in the last few years or decade...and the 1 1/2 mm/yr may be the last 50 years or a bit longer...so the total sea level rise at a place like Palos Verdes may not be noticeableOK, maybe should on dock). On top of that, local relative sea level rises are different in different parts of the world...the centers of where there were ice sheets are uplifting fast (Hudson's Bay, Sweden), while areas around the edges of the former ice are sinking in response (Rhode Island, probably many other places). There may be other areas where the local land is going up or down for non-fault related reasons..
Chris