Blissfully Unaware - is a great way to sum up the whole situation.

For a long time I believed that the two areas are independent - what happens on the Cascadia is separate from what happens on the San Andreas. Although that's probably still the case, I am no longer confident about it. Seems like one event could trigger the other. I suspect now that the Cascadia might go first - have the first quake. I have not studied the liquefaction zones. The tsunami risk is very real, in Oregon but fortunately a lot of USGS geologists have been getting the word out to the towns on the OR coast.

There will be a lot of damage to the West Coast of the USA, when the Cascadia and the San Andreas quakes happen. Realistically, they will probably be separated by a short time period. If they happen together in one MEGA Quake - kiss the West Coast goodbye!!

Pete