Seismic energy distribution in latitude and a possible tidal stress explanation

Details Seismic energy distribution in latitude and a possible tidal stress explanation Seismic energy distribution in latitude and a possible tidal stress explanation

Jun 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992pepi...71..205s&link_type=abstract

Physics of the Earth and Planetary Interiors, Volume 71, Issue 3-4, p. 205-216.

Physics

7

Scientific paper

This paper utilizes a statistical technique to investigate the global seismic energy distribution in latitude. The energy distribution in latitude has two peaks: one in each of the Northern and Southern Hemispheres with an axis of symmetry at about 10°N. The two peaks for shallow earthquakes have an interval of 90°, while those for intermediate and deep ones concentrate in low latitudes. The twin peak distribution in energy of intermediate and deep earthquakes becomes more apparent with increasing depth. Almost no energy is released in the North and South pole areas. The energy released in the Northern Hemisphere is about 30% greater than that in the Southern Hemisphere, except for the focal depths from 100 to 150 km. Through a study of the shear stress component caused by the corresponding long-period lunisolar potential, it is found that the shear stress distribution due to lunisolar constant flattering wave (M0S0) coincides with some of the above phenomena. We conclude that the long-period tidal shear stress may be one of the possible causes for the seismic energy release; or a triggering effect.
Previously at: Center for Analysis and Prediction of State Seismological Bureau, People's Republic of China.

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