. After earthquake and fire . mbers ofpeople are likely to be congregated. In so far as possible,such sites should be selected on slopes upon which sound rockfoundation can be reached. It is probably in large measuredue to the fact of their having such a rock foundation that thebuildings of the State University, at Berkeley, escaped prac-tically uninjured. The construction of such buildings as ourpublic schools demands the most earnest attention of thepeople and of the authorities charged with their construc-tion. A great many of our schools proved to be of flimsyconstruction and ill adapted t
. After earthquake and fire . mbers ofpeople are likely to be congregated. In so far as possible,such sites should be selected on slopes upon which sound rockfoundation can be reached. It is probably in large measuredue to the fact of their having such a rock foundation that thebuildings of the State University, at Berkeley, escaped prac-tically uninjured. The construction of such buildings as ourpublic schools demands the most earnest attention of thepeople and of the authorities charged with their construc-tion. A great many of our schools proved to be of flimsyconstruction and ill adapted to meet the emergency of anearthquake shock of even less severity than that of April 18. The Commission in presenting this brief report has had inmind the demand on the part of the people of the State andof the world at large for reliable information as to the essen-tial facts of the earthquake. It has, therefore, not presumedto engage in any discussion of the more abstruse geologicalquestions which the event naturally \ ^s <v^«F / Relief Map of California. The black lines indicate earthquake-faults. THE EARTHQUAKE EXPLAINED. By A. S. Cooper,Formerly State Mineralogist of California. The coast ranges of California consist of a number of brokenanticlines, fissured by faults and step-faults, nearly all of whichrun in a northwest and southeast direction roughly parallelwith each other, and with the valleys. Both sides of the faultare elevated but the northeast side is usually raised from onefoot to several hundred feet higher than the southwest side. The black line on the relief map, reproduced on the oppositepage, shows the position of the master fault of the coast fault extends from opposite Fort Bragg, in Mendocinocounty, to the Gulf of California, a distance of 700 miles. Awagon road follows 400 miles of its length. The movementsof the earth which produced the earthquake of April 18, 1906,occurred almost simultaneously in this fault throughout itsentire
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