When I saw the disruption above the last active slip surface of the Santa Cruz Island fault in Sept 06, I was wondering if instead of just shrinking and swelling of gouge, it was creep. If shrinking and swelling of gouge, you might think the disruption anywhere above the 10s of m-wide gouge zone rather than just in a 10s of cm wide zone above (one of the 2) last active surfaces. So, I was thinking that it might be shome shallow strain above a locked part of the fault...the blocks are moving past each other long-term, and I don't see why the deep part has to creep for the shallow part to creep...especially if the shallow part did not slip as much as the deep in the previous earthquake. I know that there was a lot of surface creep at Superstition Hills in the weeks (months?) after the M6.6 1987 quake. I saw the same thing a few km to the WSW a decade ago on the last active surface of the Santa Rosa Island fault. Art Sylvester of UCSB has a trilateration (?) array across the Santa Cruz Island fault about 10 km east of the outcrop I was talking about and he re-measured it a few years ago and saw nothing. I should have looked harder at the fault this past September where it runs along the dirt road...but we went out to the west end that way and back east on a different road...
Chris