CONTENTS. 



PAGH 



iNTRODrCTION 1 



Biblioij^raphy of Works relating to Earthquake Pheuomeua on the 



Pacilie Coast 3 



The Rossi-Forel Scale 7 



Table of the number of Earthquakes recorded in each year and each 



month in California, etc 11 



Table of the number of Earthquakes recorded in each year and each 



month in San Francisco 13 



Table of the number of Earthquakes recorded in each year and each 



month in San Jose, etc 15 



Earthquake shocks felt at sea 17 



Self-reg'isterinj); Seismometers of the Lick Observatory 17 



Use of the Ewing Duplex Seismometer 21 



ImiM'ovements in the Ewing Seismographs suggested by experience, 



by C. D. Perrine 33 



Reported Volcanic Eruptions in Alaska, Puget Sound, etc., 1690 to 



lS'.tfi, by Frederick G. Plummer 34 



Conclusion 38 



Catalogue of Eakthqfakes on the Pacific Coast, 1769-1897 31 



