Open AccessA Study on the Direction of Arrival of Microseisms at Kew Observatory
Author(s) -
Iyer H. M.
Publication year - 1958
Publication title -
geophysical journal of the royal astronomical society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.302
H-Index - 168
eISSN - 1365-246X
pISSN - 0016-8009
DOI - 10.1111/j.1365-246x.1958.tb00032.x
Subject(s) - microseism , seismology , geology , storm , observatory , rayleigh wave , geodesy , intensity (physics) , meteorology , geophysics , oceanography , surface wave , physics , optics , astrophysics
Summary A modification of Darbyshire's correlation method to study the direction of arrival of microseisms is used to track three fast‐moving cyclonic depressions in the Atlantic during the periods 1951 October, 1952 October and 1956 December. Good agreement between the calculated and actual bearings of the storm centre is obtained when the depression is reasonably far away from coastal regions and has a simple meteorological situation. When the storm is close to the coast, however, multiple sources of microseisms make tracking unreliable. Filtering the waves and using a narrow band about the spectral peak and using longer records improves the accuracy. In all the cases studied, the microseisms contain an appreciable amount of Love waves. The ratio of intensity of Love waves to Rayleigh waves seems to depend on the position and intensity of the storm centre.