64 



Symposium on Microseisms 



93. 3 fl-it 



Figure 6. Weather situations at 07 M.E.T. on October 7, 1947, October 28, 1947, January 14, 

 1949, and March 23, 1949. 



Acknowledgments — This investigation has been 

 made at the Seismological Laboratory of the 

 Meteorological Institute, Uppsala. The Direct- 

 ors of the Seismological stations at Bergen, Co- 

 penhagen, and Helsinki have lent me their 

 original records and given information on seis- 

 mograph constants, etc. Miss I. L. Andersson, 

 Uppsala, has assisted me in drawing the fig- 

 ures. My best thanks for valuable help are 

 due to all the above-mentioned persons. 



Bath, M., The problem of microseismic barriers with 

 special reference to Scandinavia (not yet printed), 

 1952. 



Longuet-Higgins, M. S., A theory of the origin of mic- 

 roseisms, Phil. Trans. Roy. Soc. London, Ser. Q, 

 No. 857, v. 243, pp. 1-35, 1950. 



Press, F., and Ewing, M., A theory of microseisms 

 with geologic applications, Trans. Am. Geophys. 

 Un., v. 29, No. 2, pp. 163-174, 1948. 



REFERENCES 



Bath, M., An investigation of the Uppsala micro- 

 seisms, Medd. Met Inst. Uppsala, No. 14, p. 168, 

 1949. 



Bath, M. The distribution of microseismic energy 

 with special reference to Scandinavia, K. Svenska 

 Vet.-akad., Arkiv for Geofysik, (Medd. Met. Inst. 

 Uppsala no. 22) v. 1, No. 13, pp. 359-393, 1951. 



Bath, M., Review over investigations of microseisms 

 in Scandinavia, Pontificia Academia Scientiarum, 

 Rome, (not yet printed), 1951b. 



Discussion 



J. B. Macelwane, S.J. 

 St. Louis University 



In the brief space of a few pages Doctor 

 Bath has assembled a surprisingly large volume 

 of first hand observational data on the periods 

 of microseisms recorded in the Scandinavian 

 area. Anyone familiar with such measure- 

 ments realizes what an expenditure of time 

 and painstaking labor is involved. Seismolo- 

 gists the world over will be unanimous in their 

 appreciation of the factual material thus made 

 available. 



