MORGAN HILL -- A 3.2-magnitude earthquake centered about six miles east of Morgan Hill gave southern Santa Clara County a slight jolt shortly before 5 p.m. Thursday, according to the United States Geological Survey.
The quake happened on the Calaveras Fault, a strike-slip fault, at a depth of 4.6 miles.
Public safety officials in Morgan Hill and Gilroy said Thursday evening that had not received calls from residents although a Gilroy officer reportedly felt his chair shimmy a bit.
On the USGS website Thursday night, 86 people reported feeling the quake, including 55 in Morgan Hill, 15 in Gilroy and four in San Martin.
According to the USGS, the northern end of the Calaveras Fault produced a notable 5.4-magnitude quake in October 2007 in Alum Rock, but the southern section has been historically more active. It produced a 6.2-magnitude shaker in Morgan Hill in 1984, and another of the same magnitude in 1911.
In 2003, the Working Group for California Earthquake Probability calculated that the Calaveras had an 11 percent chance of producing a 6.7-magnitude or larger temblor by 2033.
Contact Eric Kurhi at 408-920-5852. Follow him at Twitter.com/erickurhi.