ISOSEISMALS: DISTRIBUTION OF APPARENT INTENSITY. 309 
that the hill has a sort of rock-core, some distance below the surface. The shock felt 
at Meyn’s ranch was not particularly violent and caused no damage to the buildings. 
(See plate 1414.) 
(R. Crandall.) —Geologically, Livermore is on a floor similar to that of Pleasanton, but 
geographically it is about 6 miles farther east and farther from the San Andreas fault. 
The shock at Livermore was not severe, and but little real damage was done. <A few 
objects of unstable nature fell, and in the larger number of cases milk and water were 
spilt from open vessels, but not in all cases." Most of the houses in town were not 
plastered, but only a few of the plastered houses had the walls cracked, and in only one 
case was plaster known to have fallen. 
An excellent opportunity was afforded to see the effect of the motion upon pendulum 
clocks. In one jewelry store every such clock stopt, regardless of the direction in which 
the pendulum swung. One clock which had not been running before the earthquake, 
was started. Its pendulum swung in a northwest-southeast direction, as in the case of 
several clocks that stopt. About 5 per cent of the brick chimneys fell, with less than 15 
per cent cracked. 
A curious phenomenon was observed near Livermore, the explanation of which is not 
clear. At the Alviso ranch, a little over a mile north of the town, the top of a small hill 
was broken up at the time of the earthquake. The breaking of the ground did not con- 
sist of fissuring along a line, but was in the nature of an uplift of a limited area. There 
were 3 fairly well marked concentric rings where the ground had broken, the inside ring 
in each case being forced higher than the outside ring. The effect was similar to that 
obtained by placing 3 plates of different sizes within each other. The accompanying 
photograph (plate 1414) shows this feature fairly well. It was said by people in the 
vicinity that there was mud in the cracks at the time of the earthquake, but there were no 
evidences of any at the time of the writer’s visit several weeks after the shock.’ 
(Elmer G. Still.) —The Southern Pacific Company’s 20,000-gallon water-tank fell in a 
north-northwest direction; tombstones fell in various directions; a hanging lamp was 
caused to swing counter-clockwise, with the longer diameter of its orbit east and west. 
Mr. Still was asleep and was awakened by the bed being shaken north and south; the 
motion after that was in every direction. Water spilt from full tanks mostly on the east 
and west sides. Mr. Still reports that where the ground was deformed in concentric ridges, 
as described by Mr. Matthes and Mr. Crandall, there was an alkaline spring years ago. 
Santa Rita, 3 miles east of Dublin (F. E. Matthes). — A small, flat levee along the east 
bank of Tassajara Creek, immediately north of the main road, showed several somewhat 
erescentic cracks along which the ground had slipt down and toward the creek from 1 to 
3 inches. These cracks extended farther south, according to local settlers, and crost the 
road; but this was no longer traceable at the time of the visit. Chimneys had fallen on all 
the houses, but as they were not of brick the damage was slight. In the grocery store and 
bar-room articles were thrown in a southerly direction. 
Dublin (F. E. Matthes). — The damage consisted of a few chimneys broken off, and 
articles thrown down from shelves and counters. A water-tank 2 miles east fell from its 
supports, probably owing to the weakness of the latter. Several other tanks in the neigh- 
borhood were injured. 
San Ramon (F. E. Matthes). — Most chimneys had fallen. San Ramon saloon, south 
of the bridge, slid off its foundations in a northerly direction. The west end moved 
3 feet, the east end about 15 inches, being stopt by a fence-post. Several window panes 

1 This may be contrasted with Pleasanton, where at all the houses visited there was only one where 
milk was not spilt. 
2 A somewhat similar phenomenon was seen on Cahill’s ridge in San Mateo County, but there was 
nothing to suggest an explanation. 
