caa a22 4500 477047394 CHVBK 20180405111334.0 cr unu---uuuuu 170330e19960901xx s 000 0 eng 10.1007/BF00874727 doi (NATIONALLICENCE)springer-10.1007/BF00874727 Seismic excitation of the polar motion, 1977-1993 [Elektronische Daten] [Benjamin Chao, Richard Gross, Yan-Ben Han] The mass redistribution in the earth as a result of an earthquake faulting changes the earth's inertia tensor, and hence its rotation. Using the complete formulae developed byChao andGross (1987) based on the normal mode theory, we calculated the earthquake-induced polar motion excitation for the largest 11,015 earthquakes that occurred during 1977.0-1993.6. The seismic excitations in this period are found to be two orders of magnitude below the detection threshold even with today's high precision earth rotation measurements. However, it was calculated that an earthquake of only one tenth the size of the great 1960 Chile event, if happened today, could be comfortably detected in polar motion observations. Furthermore, collectively these seismic excitations have a strong statistical tendency to nudge the pole towards ∼140°E, away from the actually observed polar drift direction. This non-random behavior, similarly found in other earthquake-induced changes in earth rotation and low-degree gravitational field byChao andGross (1987), manifests some geodynamic behavior yet to be explored. Birkhäuser Verlag, 1996 Earthquake nationallicence polar motion nationallicence earth rotation nationallicence Chao Benjamin Geodynamics Branch, NASA Goddard Space Flight Center, 20771, Greenbelt, Maryland, USA aut Gross Richard Jet Propulsion Laboratory, California Institute of Technology, 91109, Pasadena, CA, USA aut Han Yan-Ben Beijing Astronomical Observatory, Chinese Academy of Sciences, 100080, Beijing, China aut pure and applied geophysics Birkhäuser-Verlag 146/3-4(1996-09-01), 407-419 0033-4553 146:3-4<407 1996 146 24 https://doi.org/10.1007/BF00874727 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/BF00874727 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Chao Benjamin Geodynamics Branch, NASA Goddard Space Flight Center, 20771, Greenbelt, Maryland, USA aut NATIONALLICENCE 700 1- Gross Richard Jet Propulsion Laboratory, California Institute of Technology, 91109, Pasadena, CA, USA aut NATIONALLICENCE 700 1- Han Yan-Ben Beijing Astronomical Observatory, Chinese Academy of Sciences, 100080, Beijing, China aut NATIONALLICENCE 773 0- pure and applied geophysics Birkhäuser-Verlag 146/3-4(1996-09-01), 407-419 0033-4553 146:3-4<407 1996 146 24 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer