ISOSEISMALS: DISTRIBUTION OF APPARENT INTENSITY. 189 
Cache Creek Canyon. — On Sunday, May 1, a large slide occurred on the side of Cache 
Creek Canyon. Mr. Weaver visited this and reports that the slide occurred about 4 
miles below the junction of the north and south branches of Cache Creek. The creek 
here flows thru a canyon not more than 1,000 feet wide, with steep walls on each side. 
At the point where the slide occurred, the creek makes a bend. The rock which slid is a 
red sandstone. The distance from the creek to the point where the slide began is about 
500 feet. The width of the slide is about 300 feet. It occurred on the south side of the 
canyon and dammed up the latter to a height of 90 feet. The water rose to that level and 
one week later, May 7, the dam broke and allowed the water to escape down the valley. 
Nearly all the material was carried off by the water. 
At the base of the cliff where the slide occurred are several very large springs; it is 
stated by Mr. Brainard that springs were common at the base before the slide occurred. 
About 500 feet back from the upper edge of the slide there is another crack, having a 
width of from 2 to 6 inches. It is about 300 feet long and the mass of rock in front of it 
appears ready to slip. No other cracks were seen. 
At Middleton the shock was not especially severe. The brick hotel was not injured, but 
some chimneys were down. 
At the toll-house on Mount St. Helena no chimneys were down and the shock was 
not especially severe. 
At Oat Hill, at an elevation of 2,000 feet, on a mountain slope facing east, Mr. J. J. 
Multer reports that no damage was sustained in consequence of the earthquake. The 
shock comprized two parts, of which the second was the stronger. The direction of 
movement was northwest and southeast. 
Vicinity of Upper Lake. — Charles Mifflin Hammond says: 
I live about 4 miles southeast of Upper Lake, in the approximate latitude of 39° 10’ N. 
and longitude 122°45’ W., atan elevation above the sea of 1,350 feet, and about 50 feet above 
the surface of Clear Lake. The house is 45 by 90 feet, well built, and a story and a half 
high. In it I have a collection of about 70 clocks, of all ages, styles, and makes. These 
stand on mantelpieces, on shelves, on the floor, on bookcases, and some are hung on the 
walls. I have no absolutely correct time, but on the morning of April 18, between 5® 13™ 
and 5" 14", my wife and I, who were asleep, were awakened by a violent rocking of the 
house. We jumped to a doorway and stood there for about 2 minutes, the house gradually 
coming to a state of rest from its violent rocking and swaying, and a roaring noise passing 
off in a southwest direction. This direction is corroborated by some of the men on the place 
who were up at the time. They all said that they suddenly heard a noise in the trees as tho 
a heavy wind was blowing thru them, and that the rumbling past away to the southwest. 
There was only one maximum and the movement certainly came from the northeast. 
I at once made an examination of the house. The southwest room showed the greatest 
disturbance. From the top of a small bookcase facing west a large china vase was thrown 
to the floor and smashed. On my desk, facing north, stood a spy-glass 2 feet high, which 
was tipt over to the southwest. In the southeast corner room, on a mantel facing southwest, 
a vase of flowers was tipt over to the southwest. Practically every one of my pendulum clocks 
had stopt, with two notable exceptions. In the southeast corner room, there stands on a 
small shelf facing northwest a very delicate Empire clock, which a sheet of paper put under 
one leg will stop. The clock kept on running, as it did thru all of the later earthquakes. 
In the southwest corner room there is another delicate clock standing on a bookcase facing 
southeast. This clock causes me a great deal of trouble, as the slightest variation in its 
level stops it; yet it was going after the main shock. 
At 10 o’clock that morning there was another shock, which was not very perceptible, yet 
it caused the above clock to stop, and also a few others. At 11" 40" I happened to be in 
the house starting the stopt clocks for a second time, when there came a third shock which 
again caused some of the clocks to stop. 
On May 6, at 8" 10™ p.M., a very violent shock came from almost due east. We were 
sitting on the piazza, and it came without a second’s warning. I judged it to be fully as 
severe as the one of April 18, but it lasted only about 10 seconds. In the southeast room, 
from the same mantel, a small wooden clock was thrown out on the floor to the southwest. 
