Did ocean motion carve Enceladus's tiger stripes?

Saturn's moon Enceladus sports a thick shell of ice surrounding a liquid water ocean. As though scraped by an enormous claw, four parallel cracks slash across its south pole. Each about 500 meters (1,600 feet) deep, 2 kilometers (1.2 miles) across and 130 kilometers (81 miles) long, the fissures spew water vapor and other materials from the subsurface ocean directly into space. But the origin of these "tiger stripes" is mysterious.