Why are earthquakes nudging the pole towards 140°E?

Details Why are earthquakes nudging the pole towards 140°E? Why are earthquakes nudging the pole towards 140°E?

Mar 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997georl..24..539s&link_type=abstract

Geophysical Research Letters, Volume 24, Issue 5, p. 539-542

Physics

5

Geodesy And Gravity: Rotational Variations, Seismology: Seismicity And Seismotectonics, Tectonophysics: Dynamics Of Lithosphere And Mantle-General, Geodesy And Gravity: General Or Miscellaneous

Scientific paper

Earthquakes have collectively the tendency to displace the pole of rotation of the earth towards a preferred direction (~140°E). This trend, which is still unexplained on quantitative grounds, has been revealed by computations of earthquake-induced inertia variations on both a secular and a decade time-scale. Purpose of this letter is to show that the above trend results from the combined effects of the geographical distribution of hypocenters and of the prevailing dip-slip nature of large earthquakes in this century. Our findings are based on the static dislocation theory and on simple geometrical arguments.

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