text:  They got water samples, expecting it might be juvenile water coming up from below. And from the isotopic analysis, it turned out to be meteoric water. It was rainwater that had filtered its way down, which helps to explain why landslides will develop often after the heaviest rainfall, maybe a month or so as the water percolates down to the slide plane. The same thing with earthquakes. And that's why I was telling people up in the northwest,