STUDIES FOR STUDENTS: 
THE RECENT ADVANCE IN SEISMOLOGY 
WILLIAM HERBERT HOBBS 
University of Michigan 
Il. THE CO-ORDINATED “DISTANT” STUDY OF EARTHQUAKES 
As already stated, in the first of these papers,” the one to whom we 
owe most for the exploitation of this new field for seismological 
study is Professor John Milne, whose later achievements crown a 
lifetime devoted to geophysical researches. In 1883 he wrote: “It 
is not unlikely that every large earthquake might with proper appli- 
ances be recorded at any point on the land surface of the globe.”’ 
Six years later the late von Rebeur-Paschwitz detected, in the photo- 
graphic records of a very delicate horizontal pendulum, movements 
which he traced to earthquakes at a very great distance. These 
studies, published in 1895, were thus the first to verify the prophetic 
t Owing to the rapid development of the New Seismology, few treatises upon the 
subject have appeared. In addition to the briefer statements in Milne’s Sezsmology 
(London, 1898) and Dutton’s Earthquakes (London and New York, 1904), the student 
may with profit consult Handbuch der Erdbebenkunde by A. Sieberg, secretary of the 
German Chief Station for Earthquake Study at Strassburg. The subject will be more 
elaborately treated in Sieberg’s Geophysik, soon to appear, and in La science séismolo- 
gique by Count de Montessus de Ballore, which it is expected will also be issued 
during the present season. ‘The most satisfactory treatment of the more strictly geo- 
logical side of the subject of earthquakes is to be found in Erdbebenkunde, die Methoden 
threr Beobachtung, by Rudolph Hoernes (Leipzig, 1893). 
2 Journal of Geology, Vol. XV, pp. 288-97. 
3 John Milne, ‘Seismological Observations and Earth Physics,” Geographical 
Journal, London, Vol. XXI (1903), pp. 1-25, map. 
4 E. von Rebeur-Paschwitz, ‘‘Europaéische Beobachtungen des grossen japanischen 
Erdbebens vom 22. Marz 1894, und des venezuelanischen Erdbebens vom 28. April 
1894, nebst Untersuchungen iiber die Fortpflanzungsgeschwindigkeit dieser Erd- 
beben,” Petermann’s Mitteilungen, Vol. XLI (1895), pp. 13-21, 39-42. (See also 
Beitrige zur Geophysik, Vol. I1.) 
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