as Meager's largest throughout the Holocene would likely produce a lahar that would devastate most of the growth in the Lillooet River valley. If such an event would occur without it being identified by authorities who would send out a public warning, it would kill hundreds or even thousands of residents. Because of this, computer programs would be able to identify the approaching information and activate an automatic notice when a large lahar is identified. A similar system for identifying such lahars exists at Mount Rainier in the U.S. state of Washington. Large landslides from Mount Cayley have occurred on its western flank, including a major debris avalanche about 4,800 years ago that dumped an areal extent of of volcanic material into the adjacent valley bottom. This blocked the Squamish River for a long period of time. Although there are no known eruptions from the massif in the past 10,000 years, it is associated with a group of hot springs. Evans (1990) has indicated that a number of landslides and debris flows at Mount Cayley in the past 10,000 years might have been caused by volcanic activity. Since the 4,800 BP landslide, a number of more minor landslides have occurred at it. In 1968 and 1983, a series of landslides took place that caused considerable damage to logging roads and forest stands, but did not result in any casualties. Lava flows The threat from lava flows in the Garibaldi Belt is minor unless an eruption takes place in winter or under or adjacent to areas of glacial ice, such as ice fields. When lava flows over large areas of snow, it creates meltwater. This can produce lahars that could flow further than the associated lavas. If water were to enter a volcanic vent that is erupting basaltic lava, it may create a massive explosive eruption. These explosions are generally more extreme than those during normal basaltic eruptions. Therefore, the existence of water, snow, or glacial ice at a volcanic vent would increase the risk of an eruption having a large impact on the surrounding region. Subglacial eruptions have also caused catastrophic glacial outburst floods. See also Anahim Volcanic Belt Geology of British Columbia Geology of the Pacific Northwest List of Cascade volcanoes List of volcanoes in Canada Milbanke Sound Group Northern Cordilleran Volcanic Province Volcanology of Canada Volcanology of Western Canada Wells Gray-Clearwater volcanic field References External links Map of