ISOSEISMALS: DISTRIBUTION OF APPARENT INTENSITY. 181 
been badly strained by the shock. The ranch stands on the east edge of the ridge, west 
of the Gualala River, and the fault runs along the mountain side several hundred feet 
below it. The slope is a steep one, densely timbered except for its upper portion. Land- 
slides were found over a large part of its surface, but only in a few isolated spots had they 
resulted in the complete removal of the original surface and the forest growing thereon; 
so that a view from across the river revealed no appreciable changes in the landscape. 
The slopes east of the river were similarly affected and the fallen timber produced a tangle 
not unlike that of extensive windfalls. In at least two places the river was temporarily 
dammed up by slides from both slopes meeting in the stream bed, but none of these dams 
was of noteworthy size. 
On the ridge east of the Gualala Valley, the ranches of A. and Chas. Lancaster were 
examined and found to have suffered less damage than Casey’s. Chimneys were broken, 
furniture was damaged, and a small slaughter-house collapsed, tho that structure was 
known to be a weak one to begin with. 
Between the two ranches a fissure was found very similar to, tho smaller than, those 
characteristic of the fault-zone. Its trend was N.75° E. No marked vertical movement 
was in evidence, and while the twisted sods and clods along its line clearly indicated a 
small horizontal movement, this could not be ascertained for lack of definite objects to 
measure it on. 
Plantation House, Sonoma County. — Most of the houses in this place stood the shock 
well. One cottage which was crost by one of the strongest fault fissures suffered the 
partial collapse of its underpinning. Had the displacement of the fault not been dis- 
tributed over a zone 270 feet wide in this locality, the destruction would probably have 
been much greater. As it was, broken chimneys and windows and slight damage to 
underpinning were the principal destructive effects within the zone. 
Timber Cove, Sonoma County. — Altho this town is fully 1.5 miles west of the fault, 
the intensity was apparently but little less than at places much closer to it. The under- 
pinning of one dwelling collapsed, all brick and tile chimneys broke off, and household 
articles and furniture were thrown down with violence. 
In the bluffs along the coast and in the numerous rock cuts along the wagon road, the 
rocks appeared loosened up, many old fissures having opened and left the rock masses 
in more or less unstable positions. Landslides, in rocky as well as in loose material, have 
occurred in a great number of places, tho none were at all extensive. 
Fort Ross, Sonoma County. — At Fort Ross, 0.75 mile from the fault, the intensity 
of the shock was probably greater than the actual damage would indicate. The old 
Russian Church and several other buildings suffered thru collapse of their underpinning, 
but all in a fair state of repair stood the shock, as did the more recently built dwellings. 
The dwelling of Mr. G. W. Call, proprietor of the place, was violently shaken. The 
table was moved across the floor to the south and furniture generally was thrown to the 
ground. There was much broken crockery and glassware. The contents of a pantry, 
consisting of jars of preserved fruit, were nearly all thrown from the shelves. In cleaning 
up the wreck after the shock, 6 wheelbarrow loads of broken objects were picked up off 
the floors of the rooms. In Mr. Call’s room a high case was thrown across the bed in 
which he was sleeping. 
Mr. Call stated that in his neighborhood hanging lamps were caused to swing in a 
circle corresponding with the apparent movement of the sun. There were several shocks, 
quickly following each other; the first was not the strongest. They seemed to increase 
in force up to the third or fourth and to come from different directions. He Judged that 
there was a strong vertical impulse. Chimney tops were thrown off, some chimneys 
being shattered to the bottom. Many redwood and pine trees were broken off, some at 
the ground, being uprooted; but generally broken about halfway up. All loose furni- 
