ISOSEISMALS: DISTRIBUTION OF APPARENT INTENSITY. 175 
there were noted after the earthquake funnel-shaped depressions resembling extinct 
voleanoes in miniature. These were only a few feet in diameter. 
At Glenblair, 5 miles east of Fort Bragg, the intensity of the shock appears to have 
greatly diminished. The place is on a creek bank, between high hills. Mr. A. P. Scott 
reports that the saw mill was slightly damaged and that the store goods were thrown 
from north and south walls. 
Caspar, Mendocino County. Population 300. (F. E. Matthes.) — The shock was 
apparently not so severe. Most of the wooden houses showed no damage. Even the 
large brick store of the lumber company appeared little affected. It was probably well 
built and sustained only a few cracks of little importance. All chimneys were broken 
without exception. The bridge over Caspar River is a total wreck, but it appears to 
have been a weak structure to begin with. 
Mendocino, Mendocino County. Population 900. (F. E. Matthes.) — This town, like 
Fort Bragg, is on the first of a series of wave-cut terraces which score the coastal slope. 
The present sea-cliffs at the lower margin of this terrace vary from 30 to 100 feet in height. 
The terrace is veneered with Quaternary marine sands which are in part so compacted 
and coherent that they may be designated sandstones. The town shows but little damage. 
Only one large frame building, the Occidental Hotel, was wrecked thru the giving way 
of its underpinning. Few chimneys escaped destruction. Plaster fell in quantities in 
some dwellings, while others suffered but little in this respect. Only one out of a con- 
siderable number of water-tanks was wrecked. In the river bottom adjoining the town 
the destructive effect was notably greater. The lumber mill of the Mendocino Lumber 
Company was the chief sufferer. It lost its tall smokestack, and in addition had its 
large fly-wheel in the engine-room broken by the shock. This fly-wheel was oriented 
almost east and west on a north and south axis. According to the engineer, it was not 
in motion at the time of the quake. The oscillations of its exceedingly heavy rim caused 
the fracturing of the spokes in the two upper quadrants. The fragments were still visible 
in the mill yard. 
The bridge over the Big River was also severely damaged, a short span in the long 
approach on the north side collapsing entirely. The structure had been repaired at the 
time of the visit. 
(O. H. Ritter.) — Vibrations at Mendocino seemed to be oscillatory, moving north 
and south. JI remember the feeling clearly, for my bed extends north and south, and 
moved in a straight line north. The high-school building was moved on its foundations 
about 2 inches north, and a 3,000-pound safe in town rolled north 3 to 4 inches. The 
wing of Occidental Hotel which extends east and west collapsed; while the wing 
extending north and south remained standing, altho the foundation braces were thrown 
slightly out of plumb in a north and south direction. It is very clear here that the vibra- 
tions were north and south. The day after the shock there were numerous cracks in 
the ground. Chimneys seem to have fallen north and south, generally south; numerous 
slides on the cliffs took place, some very large. The road between Point Arena and 
Mendocino was cut off by numerous slides (report of tourist). The bridge across Big 
River, extending north and south, collapsed. The fall of the span was due to the shift- 
ing north of the piles on the north side of the river, thus allowing one end to drop. 
(William Mullen.)— The shock at Mendocino began with a tremulous motion, increasing 
very quickly and decreasing also quickly. The principal disturbance was strongest 
toward the end. The motion seemed to be up and down, and also from north to south. 
Chimneys fell mostly to the north, while tombstones fell to the north, south, and east. 
It lasted about 40 seconds. Beds were moved from 3 to 5 feet and pianos to the same 
extent. Pictures hanging on walls showed marks of having swung 8 inches. A rumbling 
sound like distant thunder preceded the shake, and was loudest at the commencement of 
