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TitleStudy of stresses and ruptures in earthquake foci with the help of dislocation theory
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AuthorBalakina, L M; Shirokova, H I; Vvedenskaya, A V
SourceA symposium on earthquake mechanism; by Hodgson, J H (ed.); Publications of the Dominion Observatory vol. 24, no. 10, 1961 p. 321-327, (Open Access)
PublisherCanada Department of Mines and Technical Surveys
MeetingInternational Union of Geodesy and Geophysics, Association of Seismology and Physics of the Earth's Interior, Twelfth General Assembly; Helsinki; FI; 1960
Mediapaper; on-line; digital
RelatedThis publication is contained in Hodgson, J H; (1961). A symposium on earthquake mechanism, Publications of the Dominion Observatory vol. 24 no. 10
File formatpdf
Subjectsgeophysics; tectonics; mathematical and computational geology; seismology; earthquakes; earthquake mechanisms; crustal movements; faulting; stress analyses; earthquake foci; methodology
Illustrationsschematic representations; stereonet projections; tables; geoscientific sketch maps
Released1961 01 01; 2018 11 19
AbstractThe paper reviews the authors' work done mainly during the three-year period since the Toronto meetings. A theory is first outlined, based on the theory of dislocations, which permits the determination of the principal axes of stress in an. earthquake focus. The technique for the application of the method, based on the first motion in P, SH and SV, and using the Wulff stereographic projection, is then described. This method has been applied to earthquakes in three regions. In the Hindu Kush it is shown that the regional pressure acts in a horizontal plane and normal to the strike direction of the mountain range. The tension acts along the direction to the zenith. In the northwestern Pacific the pressure axes for most foci are also oriented perpendicular to the geological features. In Prebaikalye, on the other hand, it is the tension axes which are normal to the geological features.