Just by opening this knife, you’ll know how it got its name. The Quake and Quake XL are two of our largest folding knives. With that, it is powered by our SAT 2 (SOG Assisted Technology) that propels the blade open with just a push of a thumb. Instead of a thumb stud, the cross guard folds in when closing the knife and is used as the lever to assist with the opening motion. Combined with a thick dual-tone VG-10 blade, forged aluminum handles, full length stainless steel liners, the Quake is one formidable knife that packs a punch.

http://www.sogknives.com/quake.html
http://www.sogknives.com/quake-xl.html