Rock Avalanche on Earth (image) Washington University in St. Louis Share Print E-Mail Caption Low coefficients of friction in moving masses of rubble also might explain anomalous landslides on Earth, called sturtzstroms. One famous example is the prehistoric Blackhawk landslide; Rock falling from the San Bernardino mountains in California traveled an astonishing five miles into Lucerne Valley. Credit Kerry Sieh/USGS/public domain Usage Restrictions Credit required Share Print E-Mail Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.