CONTENTS 



PART I 



SOUTHERN CALIFORNIA ATTACKED 



Page 



Nature of Predictions 4 



Alleged Reasons for the Prophecies 6 



Effect of the Willis Statements 9 



Some Comparisons 9 



PART II 



GENERALIZATIONS CONCERNING EARTHQUAKES 



Methods of Study 12 



Occurrence of Earthquakes 13 



Seismicity 14 



The Lines of Greatest Seismicity 15 



The Transverse Line 19 



The Line of Greatest Seismicity not Confined to California . . 19 



Seismicity of Southern California 20 



The Los Angeles City Region One of Mild Seismicity 27 



Differences Between the Seismic Conditions of Northern and 



Southern California 29 



Difference in Material 30 



Geologic Formations of Los Angeles Not Unfavorable 31 



Differences in Structure 31 



Earthquake Dangers Exaggerated 34 



Relations of Fault Lines to Danger 37 



Relations of Earth Movements to the Abyssal Escarpment. . 39 



Testimony of the Inglevi^ood Fault Line 39 



Earthquake Damage Is Largely Avoidable 41 



Seismic Conditions Are Probably Declining 42 



Why the Predictions Were Unwarranted 43 



Collapse of the Prediction of Alternate Occurrences 43 



Why Our Earthquakes Cannot Be Predicted 45 



Opinions of Others 46 



Dr. G. K. Gilbert's Opinion 47 



Futility of Attempts to Ascertain Laws of Periodicity in 



California 49 



Forebodings Not Shared by Most Geologists 50 



Mr. H. 0. Wood's Opinion 51 



Fundamental Data Proved Erroneous 52 



The Coast and Geodetic Survey Revises Its Data 55 



IX 



