ISOSEISMALS: DISTRIBUTION OF APPARENT INTENSITY. 307 
that there was more water since the shock than there had been even in the wettest part of 
the winter. 
Sunol (R. Crandall). — Sunol is a small town in the north end of Sunol Valley. The 
intensity of the earthquake there was of especial interest, because the town lies almost 
upon the line of the Sunol fault. This fault is the largest one known in the Mount 
Hamilton range, and has a northwest-southeast trend parallel to that of the San Andreas 
fault. It was expected that some compensating movement might be found to offset the 
slip along the San Andreas fault, and this Sunol fault was considered the one most likely 
to show that compensatory movement. The town stands partly on gravels and partly 
upon hard sandstone. The gravels are quite firm; much more so than the gravels on 
which the town of Niles is built. The gravels at Sunol are not thick, and the foundation 
is much firmer than that at Niles. It was quite apparent that Sunol had not felt the 
shock as severely as it had been felt at Niles, 6 miles to the west, or at Pleasanton, 6 miles 
farther east. Only a small percentage of the chimneys fell. Of other objects, few except 
bottles and vases fell; and a window was broken at the post-office. As there was no 
movement along the Sunol fault, the intensity at Sunol was less than at Niles, but the 
fact that it was also less than at Pleasanton shows that the difference must be in the 
formations underlying the two towns. 
(IF. EK. Matthes.) —Over 75 per cent of the chimneys in Sunol were broken. Some were 
twisted in a clockwise direction, while others were apparently thrown straight, most 
of them to the east. Many chimneys were cracked but were still in place. A few win- 
dows were broken, notably those of the post-office. The town is on alluvial ground, 
close to the hills. The depth of alluvium is estimated at the ereek-bed to be about 
50 feet. The steel bridge southeast of the town was found entirely undamaged. The 
flume between Sunol and Niles was damaged at a point 2.5 miles below Sunol. A few 
boards were knocked out of place, but the damage was slight and quickly repaired. 
The Apperson house, a substantially built structure with strong chimneys, had two of 
the chimneys twisted and one left intact. 
Verona (F. EK. Matthes). — All the chimneys on the main house of the Hearst residence, 
6 in number, were cracked, but none was thrown down. The studio has a long crack 
running immediately above the projecting beams supporting the roof, along the northeast 
wall, 18 inches from the eaves. No damage was occasioned to plaster or walls, except in 
the studio. The chimney of the power-plant, at the foot of the hill, was found cracked. 
The “cottage,” built of wood, suffered no damage. No windows were broken. 
Pleasanton (R. Crandall). — The town is on a flat valley-floor composed of gravels, 
apparently the same as those at Sunol, but of a later age. Probably the Sunol gravels 
washt down from the hills to form a valley-floor. The ground upon which the town is 
built, then, is similar to that at Niles. The shock was felt quite sharply at Pleasanton, 
but not so much so as at Niles. Such articles as vases, clocks, and dishes fell in most cases 
and milk and water were spilt from open vessels. Practically no plaster fell, but houses 
that were plastered had numerous cracks in the walls. 
The intensity, as shown by falling chimneys, was as follows: 30 per cent of all 
chimneys fell; 48 per cent of the brick chimneys fell; 30 per cent of the chimneys were 
terra-cotta, but only 3 per cent of these fell; of the brick chimneys which did not fall, 
30 per cent were cracked. 
(F. I. Matthes.)—About 50 per cent of all brick and tile chimneys in Pleasanton were 
thrown down. No marked preponderance in any one direction was noted. Nearly 
every brick building in town was somewhat injured. Cracks in the masonry and the dis- 
lodgment of occasional individual bricks in arches above windows and cornices constitute 
the principal damage. The only stone house, a 2-story saloon, suffered more severely 
than any of the brick buildings, the walls being badly cracked at the corners and even 
