(click on image for larger graphic. Image source: http://quake.wr.usgs.gov/recenteqs/Maps/116-33_full.html )
The above image was captured on Sept 1, 2005.
“Officials with the USGS said that a geothermal plant in the area may be the cause of the temblors, because when water is re-injected back into the ground, it can cause the earth to shake. San Diego State University geology professor Pat Abbott said that what is taking place in Imperial County is not a common occurrence. “It happens — not on a regular basis, but certainly every decade anyway, there’s big earthquake swarms,” said Abbott.”
