Physics
Scientific paper
Jul 1996
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996em%26p...74...35g&link_type=abstract
Earth, Moon, Planets, Vol. 74, No. 1, p. 35 - 47
Physics
2
Earth Rotation
Scientific paper
An earthquake produces a global static displacement field due to the dislocation in the epicenter. This displacement field in turn changes the Earth's inertia tensor, hence exciting the variation of both polar motion and length of day. In general, a larger earthquake produces a greater displacement field, which has greater effects upon the Earth's rotational properties. It is found that the polar motion and the length of day excited by earthquakes are at least two orders of magnitude less than those observed. Using the fault plane parameters, the location of the epicenter and the expression given by Dahlen (1973), as well as the step function for earthquakes occurring in the period 1977-1994, the accumulative change of the axial and equatorial moments of inertia of the Earth is estimated. Results show that the change of pole axis direction induced by a single earthquake is independent of the magnitude of the earthquake, which is random, but a large earthquake contributes most to the accumulative change of direction of polar drift. An earthquake tends to make the rotational pole drift towards the direction 130-150°E. This direction is different to that inferred from observations. Accumulative changes of both the two equatorial principal moments and the axial moment of inertia of the Earth present the strongest non-randomness and secular behaviour. The change depends upon the slip angle of the fault movement to a large extent.
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