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.

Why are earthquakes nudging the pole towards 140 E?

SPADA, GIORGIO
1997

Abstract

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.
GEOPHYSICAL RESEARCH LETTERS
SPADA, GIORGIO
File in questo prodotto:
Eventuali allegati, non sono esposti

I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.

Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/11585/772139
 Attenzione

Attenzione! I dati visualizzati non sono stati sottoposti a validazione da parte dell'ateneo

Citazioni
  • ???jsp.display-item.citation.pmc??? ND
  • Scopus 16
  • ???jsp.display-item.citation.isi??? 14
social impact