Hi All. This is from a report made in 1992 from the Division of Mines and Geology.

It seems that the Loma Prieta quake had a small degree of influence on the Rodgers

Creek fault. Take Care...Don in creepy town.

Extensive, deep, landslide complexes and lateral-spread features of probable latest

Quaternary age are widespread along the Rodgers Creek fault from Taylor Mountain

almost as far south as Petaluma Road. These features, which have been partly mapped

by Brown (1971-1972), Huffman (1971) , Herd (1978), Huffman and Armstronq (1980),

and Hart (1982), extensively obscure recently active fault strands, especially on

Sonoma Mountain and Taylor Mountain. Lateral spreading, or ridgetop; spreading is

believed to be seismically triggered and occurs mainly on the upper slopes.

These features, which have been partly mapped and/or tops of ridges and mountains.

structurally gradational with landslides, Lateral spreading, or ridgetop spreading,

is believed activated both as a result of seismic and hydraulic forces.

However, the lateral-spread features tend to form along bedding planes, faults and

other zones of weakness. In a sense, lateral spreading is incipient landsliding.

The ridgetop spreading and associated landslide features that formed or were

enhanced by the 1989 Loma Prieta earthquake (Hart and others, 1990; Spittler and

Harp, 1990; Ponti and Wells, 1991: are similar to those features observed along the

Rodgers Creek fault, although somewhat more sharply defined