The three subsequent landslide lobes were smaller, and appeared to be wetter but less highly fluidized than the first. The first deposit was sufficiently fluidized that people sank to 10 cm depth when walking across its surface. While the long axes of the largest boulders transported by the landslide were 2-4.5 m, boulders had average diameters of 0.4 m in the first flow, and 0.58 m in the second flow. A cone of loose material that surrounds the well appeared to have been constructed when landslide debris around the well was thrown out by escaping steam. An earlier such cone collapsed, forming one of the upper 3 landslide lobes.
Reports vary on the presence of precursor activity.
However, no earthquakes were reported. ZCQ-4 was drilled in 1981 to 1,026 m total depth. It was the best producer among the five producing wells, flowing at 66,000 pph steam at 125 psig wellhead pressure. Geothermal Resources Council Transactions, v. 15, p. 425-433. Geotimes, May 1991, p. 20-22.