Todd..see my post on the thread below...I slipped in a comment about that quake and one of the active faults....I'll add to that comment here...the San Cayetano fault dips north and forms the north boundary of Ventura basin. The Oak Ridge fault dips south and forms the south boundary. The 2 faults nearly touch at the surface at the route 126, east of Fillmore. (?)Both are active...the San Cayetano has slipped at least 9 km in the last 1 million years...that is 10 mm/yr. The Oak Ridge fault near Fillmore has slipped about 5 km in that time (Yeats references). This is slip...not shortening...shortening is about 7 mm/yr today across the basin from GPS (Donnellan references)...although I need to look at a paper that uses more recent data. Ventura basin would be expected to have really terrible ground motion amplification...because it is one of the deepest sedimentary basins for sediments less than 5 million years old in the world (it has been published as the deepest (Yeats), but I think there is a deeper one in the Caspian Sea and maybe elsewhere). Just like ocean waves coming into shallow water that slow down and crest, earthquake waves slow down and amplify...but earthquake waves in Ventura basin are also going to reflect off the overhanging walls of the basin. Fillmore had quite a bit of damage in the Northridge earthquake...If you get your quake as a M5 or larger, and it is close to the basin, it will at least knock things off of shelves...While I know a lot about that area, I do not have any expertise about whether a quake is likely soon....just that long-term (100s of years), there should be frequent quakes
Chris