Earthquake manufactures a wide array of powered equipment, such as inverter generators, log splitters, water pumps, chainsaws and more. The Earthquake Rolling String Trimmer has a Briggs & Stratton engine and a guard that protects the operator from flying debris. Other safety features include a q ... Read More uick-stop lever that stops the trimmer head when the handle bar is let go. The head drive lever makes sure the trimmer mechanism runs smoothly. Other Earthquake products include edgers, front-tine and rear-tine rototillers, earth auger power heads, and chipper shredders. The Earthquake Electric Start Edger features a four-position height-adjusted and clutch-driven throttle. Its lightweight design features a keyed electric start, 9-inch blades and a powerful 43cc Viper engine.