USGS Expert: Human activity is triggering earthquakes

SAN FRANCISCO (KRON) — There is mounting evidence that in many parts of the country human activity is triggering earthquakes — and the problem is getting worse.
An expert from the U.S. Geological survey spoke about the extent of man-made quakes, and whether or not they are also an issue in the U.S.
Geologists have known since the 1960s the injecting waste water into the ground can trigger earthquakes. But in just the past few years, they have seen a dramatic jump in the number o