A NASA radar device has found previously unknown Napa Valley fault lines in the wake of the massive 6.0 Napa quake.

The 6.0 quake, which killed one woman and injured 170 people, was the biggest to shake northern California in 25 years.  Over 800 homes were damaged and so far 103 are officially too damaged to repair.

As scientists from NASA and the U.S. Geological Survey discovered the West Napa Fault moved 18 inches along its 9.3-mile long length, they discovered a series of smaller faults that run parallel to West Napa Fault.  The new small faults are believed to let off some of the strain on the region but are likely not significant enough to cause major quakes on their own.

“These really tiny ones are probably not big enough faults to have a significant earthquake, but it’s a good thing to have people go out and check whether they are part of a larger fault system,” said Eric Fielding, a geophysicist at NASA’s Jet Propulsion Laboratory.

USGS scientists say that the data is likely going to cause a revision in the quake’s magnitude up a tenth of a point to 6.1 when final data is assimilated.