Speaker earthquake protection and isolation

August 24, 2014 we had a 6.0 earthquake in Napa, CA, which knocked over about 3/4 of the cabinets in my home, along with my Silverline Grandeur II speakers, which ended up getting pretty dented in the process. Luckily our home stayed on it's foundation, while four homes in our neighborhood were knocked off of theirs. Needless to say it shook quite a bit. Alan Yun, the owner of Silverline, who lives within 40 miles, gave me a good deal on new speakers. I asked him if he knew a way to mount the speakers to a larger platform so that another earthquake wouldn't knock them over, and at the same time they wouldn't lose their sound quality. He couldn't offer any advice. To satisfy my wife, I used the spike threads at the bottom of each speaker to mount them to 1" thick Corian, which is 4" larger around than our speakers. I put rubber grommets between the speaker and Corian. They sit on carpet. I know that I lost some focus and bass control that I previously had when using the Silverline provided spikes. I want to protect my speakers, but I hate giving up sound quality. I was wondering if anyone on Audiogon can offer advice.