ISOSEISMALS: DISTRIBUTION OF APPARENT INTENSITY. 231, 
out of place. Two or three smaller buildings in the immediate neighborhood were also 
notably damaged. Intensity equivalent to high values of Grade C was certainly developed 
hereabouts. In some cases it undoubtedly reached low values of Grade B. Yet the glass 
walls and roof of the conservatory, and of the aviary close by, were not appreciably 
damaged. This discrepancy shows clearly that some purely local factor determined the 
amount of damage. 
Buildings on the beach sands near the Cliff House, close to the sandstone cliffs of Point 
Lobos, were strongly shaken. A small 1-story brick pumping. station had its walls 
badly cracked and portions thrown down; its chimney stack also was broken. Weak 
underpinning in some neighboring frame buildings yielded perceptibly. Here also an 
abrupt transition is noticed from intensity of Grade C on the sands to Grade D on the 
sandstone cliffs. 
Near Lakeview, fairly well built frame buildings on dune sand of unknown thickness 
were caused to lurch and shift their positions. 
Ocean Avenue, between Ingleside and the sea, tho almost devoid of structures, shows 
by the unearthing, bending, and even breaking of drainage and water pipes, and by 
fissures in the road and asphalt paving, a change of intensity from Grade C to Grade B. 
LOCALITIES OF LESSER IMPORTANCE AFFECTED BY INTENSITY OF GRADE B. 
In the neighborhood of the crossing of Steiner and Sutter Streets, there is an irregularly 
bounded district a little larger than a city block in which several buildings not conspicu- 
ously weak were totally destroyed. St. Dominic’s Church, at the corner of . Steiner and 
Bush Streets, was a complete ruin, as the illustration (plate 924) shows. Its steeple 
towers were ruined, its roof fell in, and all its walls were so badly cracked that it became 
a menace to the neighborhood. If the shock had occurred during the hours of religious 
service, few would have escaped from the building alive. Probably it was not a building 
of the most excellent construction; but, on the other hand, it did not appear to be built 
flimsily. It certainly suffered a most violent shaking. Near by small frame dwellings 
were pitched from their underpinning. 
On Geary Street, just above Fillmore Street, two wooden-framed brick buildings stand- 
ing side by side — the Albert Pike Memorial Temple (Masonic) and a Jewish Synagogue— 
were utterly wrecked, as the illustration shows. (Plate 878.) The Girls’ High School, 
near by on O’ Farrell Street, at Scott Street, poorly and flimsily built, was badly damaged. 
Its walls were much cracked and portions of the gable walls were thrown down. 
This district of Grade B intensity is on the floor of Upper Hayes Valley and is sur- 
rounded by a relatively broad area in which Grade C effects prevail. It lies near the base 
of the hills which hem in the valley on the east. The surface strata are sand and alluvium 
extending to no great depth, unless the slopes of the bedrock hills change suddenly where 
they pass under the mantle of loose materials. No explanation can be offered for the 
occurrence of this limited area of high intensity (Grade B) unless it be that the district 
has been converted into “‘made”’ ground by extensive grading in the preparation of the 
surface for building sites and streets. 
At the corner of Vallejo Street and Van Ness Avenue, fissures were formed in the asphalt 
paving, sidewalk pavements were thrust over the curbing, and water-mains and sewers 
were broken. Buildings were thrown out of the vertical, and foundations and lower story 
walls were shifted and crusht. The walls about the foundation of one brick building were 
actually deformed into undulations with much consequent cracking. This building was 
so badly damaged that it had to be taken down. Surrounding this corner is a small ovoid 
district, about 2 blocks in extent, in which the intensity was clearly of Grade B. This 
was once a sharp ravine and had been filled to a depth of 40 feet in order to provide a 
