The San Francisco call., 1906-06-04
Temblor Scarp Is Nearly
Two HundredM
in Length.
Runs From Point Arena
to the County Line OF
San Benito.
sneclal nispatch to The CAN.

SACRAMENTO, June 3.-The commit
tee appointed by Governor Pardee to
Investigate and inquire into the origin
and character of the disturbance of the
earth's crust which gave rise TO the
earthquake has completed and ad-
dressed to the Governor its preliminary
report
This body of scientists, known as
the State Earthquake Investigating
Commission. has been for several weeks
investigating the temblor throughout
the State, gathering data and compiling
statistics.
Professor Andrew C. Lawson of the
State University. Professor G. K. Gill
bert of the United States Geological
Survey. Professor Fielding Reid of
Johns Hopkins University. Professor
j. c. Branner of Stanford University,
Professor A. o. Leuschner and Profess
or George Davidson of the State Uni
versity, Professor Charles Burkhalter
of the Chabot Observatory and Pro-
fessor William Wallace Campbell, di-
rector of the Lick Observatory, are the
members of the commission.
The scientists organized on April "a
and outlined the work under three
branches Following is. their report in
part:
REPORT OF SCIENTISTS.
From the purely scientific point of
view the earthquake of April is is one
of the most interesting on record. a
contribute greatly, not only to our
knowledge of the evolution of the
earth's crust. but also TO our knowledge
of the means Of minimizing the ca
lamities which arise from the destruc-
tion of buildings, water pipes and other
structures. Certain of the studies fall
and architect and will be of great value
in the future construction of buildings
in San Francisco and throughout the
State.
The popularity of surface features
along the line of the coast ranges of
California lies in the fact that they
are not due to atmospheric and steam
erosion of the uplifted masses, but have
been formed by a dis1ocation of the
earths crust. Along this line are very
commonly found abrupt changes IN the
normal slope of the valley sides, giving
rise TO what are technically known as
searps Where their line traVerses the
most desert parts of the coast ranges
in the carissa plain the aggregate OF
features is commonly referred TO as the
earthquake crack.
The report then deals technically
with the extent of these riffs or lines
of dislocation, which run ebliquely
through the entire breadth of the Coast
Range, and says that every movement
in this line from the earliest periods
produced an earthquake The move
menus are Sduscu oS tSoe III tAic u uot'
which accumulate until they exceed in
strength the rocks composing the crust
and find relief in sudden rupture The
earthquake of April Is was due to one
of these movements.
The extent of the rift has not yet
been fully ascertained, but it extends
certainly from Alder Creek, near Point
arena, to the vicinity of San Juan, in
san Benito County. a distance OF about
185 miles.
UNIQUE EARTHQUAKE.
The great length of rift upon which
movement has occurred makes this
earthquake unique Within an hour
of the main shock twelve minor shocks
were observed at the Berkeley observ-
atory. Before p. m. of the same day
thirty-one shocks were noted in ad-
dition to the main disturbance. The
minor shocks are attributed to the ten
dency upward of the subordinate ad-
justment of the earth's crust.
The destructive effects of the earth
quake are distributed with reference TO
the line of rift a greater portion of
the northern end of the southwest side
of the rift lies in the Pacific Ocean.
From Eureka TO Fresno. however, the
southern part of the southwest side of
the rift received heavy manifestation.
The report closes with 4 special rec
omemndation that in the erection of
public buildings sites shall be partie-
ularly examined owing to the effects
of vibrations on soft soils and made
! lands. A more voluminous report will
follow upon the completion of the in
vestigations pursued by the corps of
scientists