The Thistle landslide in Utah County is moving again.

The reactivated slide in Spanish Fork Canyon poses no danger, but "we see it as a harbinger of what else might happen this year in terms of landsliding," Gary Christenson, a Utah Geological Survey geologist, said Tuesday.He said the renewed movement of the slide first was reported to the agency early this month by its former director, Genevieve Atwood, who now is a consultant.

A 1,500-foot-long, 500-foot-wide portion of the slide is moving slowly, Christenson said. That portion is about two-thirds of the way up the southeast side of the slide, which is 6,000 feet long and 1,000 feet wide.

The Thistle slide in April 1983 followed two wet winters and came during a period of slides and floods throughout Utah. It blocked the highway and railroad line in the canyon and dammed the Spanish Fork River, creating a 100-foot-deep lake that destroyed Thistle, forcing nearly two dozen families to evacuate. Damage was estimated at $200 million to $337 million.