Given the graph shown here, what can be inferred about relationships between rainfall and landslides? A graph of landslide occurrences.The graph plots mean rainfall intensity in inches per hour versus rain duration in hours. A curve falls with decreasing steepness from (20 hours, 0.11 inches per hour) to (55 hours, 0.04 inches per hour). The area below the curve is labeled landslides unlikely. The area above the curve is labeled landslide very likely. A cluster of January 1986 landslides are plotted between (30 hours, 0.08 inches) and (30 hours, 0.19 inches). A cluster of March 1997 landslides are plotted between (43 hours, 0.06 inches) and (43 hours, 0.1 inches). After USGS Fact Sheet 2007-3005. Multiple Choice The shorter the duration of rainfall, the more likely landslides will occur. The more intense the rainfall, the shorter the duration required to trigger landslides. March 1997 landslides occurred with more intense rainfall than January 1986 landslides. The duration of rainfall was greater with the January 1986 landslides than the March 1997 landslides