4.2 quake rumbles The Geysers
By Jim Shock - Record-Bee staff
Wed May 21 03:00:06 2003 -- ANDERSON SPRINGS - A nearby, shallow earthquake shook the ground of Cobb Mountain about 9:50 a.m. Tuesday, fraying the nerves of area residents who place the blame for the earthly phenomenon on the development of The Geysers.

The jolt of 4.2 preliminary magnitude was centered at The Geysers, close to Anderson Springs where a 3.65 shaker jolted items from the shelves onto the floors within the past 10 days. The epicenter is about 14 miles north of Healdsburg in Sonoma County.

Jeff Gospe, who resides in Anderson Springs said Tuesday's quake was one of the largest recorded since he moved to the area, eclipsed only by a 4.8 a few years ago.

"It is not deniable," Gospe said, "these shallow quakes are man-made by wastewater injection and the withdrawal of steam to turn the geothermal generators. They are geologically shallow and we feel six to eight every day, some stronger than others."

Gospe said he predicts that the shaking will increase when treated wastewater begins to be injected into the magma field from the Santa Rosa project within the next year.

The quake occurrence was reported by the U.S. Geological Survey and there were no reports of damage or injuries.