REPORT OF THE PRESIDENT, 1922. 11 



California Institute for conference, while Dr. A. A. Michelson, of 

 Chicago, Dr. Henry Norris Russell, of Princeton, the late Dr. J. C. 

 Kapteyn, of Groningen, Dr. C. G. Abbot, of the Smithsonian Institu- 

 tion, and others cooperating with the Observatory have helped to 

 forward this investigation. In order to further the progress of this 

 work the Carnegie Corporation of New York has made an appropriation 

 of $30,000 a year for five years. By means of this grant Dr. Millikan 

 and Dr. Noyes, of California Institute, are made research associates 

 of the Carnegie Institution, thus making possible more rapid advance 

 in this series of cooperative studies. 



In the report of 1921 mention was made of the initiation of investiga- 

 tions in seismology or the study of earthquakes. The problem involves 

 study of the nature of movements of the earth's crust and the expres- 

 sion of these movements in earthquakes, which are both geological and 

 physical phenomena. This series of investigations should ultimately 

 give us a knowledge of earthquakes which will make possible a diminu- 

 tion of their danger by teaching us how it may be met. The study 

 must be approached in such a way as to bring to bear the most advanced 

 views in all the sciences concerned with problems of the earth's crust. 



Under the guidance of an able advisory committee consisting of J. A. 

 Anderson, physicist of Mount Wilson Observatory; Ralph Arnold, 

 consulting geologist; W. W. Campbell, Director of Lick Observatory; 

 A. L. Day, Director of Geophysical Laboratory of the Carnegie Insti- 

 tution of Washington ; A. C. Lawson, Professor of Geology at the Uni- 

 versity of California; R. A. Millikan, Director of the Norman Bridge 

 Laboratory of Physics of the California Institute of Technology; Harry 

 Fielding Reid, geologist and physicist of Johns Hopkins University, 

 and Bailey Willis, Professor of Geology at Stanford University, a plan 

 has been worked out for attack on the fundamental questions involved 

 in earthquake study. Marked advance has been made during the past 

 year, and it is most gratifying to report the whole-hearted cooperation 

 of a wide range of the most important agencies in America concerned 

 with the phenomena involved in crustal movements. The United 

 States Geological Survey has undertaken the preparation of detailed 

 maps covering areas of active earthquake movement along the 

 great San Andreas fault or rift in California. The United States 

 Coast and Geodetic Survey has entered upon the work of exact 

 triangulation of certain regions of California which have been affected 

 by earth movements. This survey is conducted with a view to 

 securing detailed information regarding the shift of the earth's crust 

 which has occurred in connection with recent earthquakes. It 



