Advances in Geophysics, Vol. 47 by Renata Dmowska

By Renata Dmowska

Advances in Geophysics quantity forty five provides major themes of famous curiosity to the geophysical group. the 1st subject is ice debris within the surroundings. Mathematical descriptions of ice particle shapes, their progress charges, and their effect on cloud improvement are provided. the second one subject is earthquakes and seismological mapping. The authors current their study related to predicting the positioning and depth of earthquakes.

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Uplift since 1964 on Kenai Peninsula and adjacent areas. The uplift is plotted relative to tide gauge station T19 at Seward (608070 4300 N, 1498250 4300 W). The red arrows show the uplift as determined from tide gauge observations, the blue arrows show the uplift determined by comparing post-earthquake leveling height observations to contemporary GPS vertical position determinations (using relative geoid heights from the GEOID99 model to transform between the orthometric and geometric coordinate systems).

Although the tilt rate may have decreased with time, the details of the temporal evolution are not resolved. The deformation may be strongly influenced by strain accumulation and release on secondary faults rather than the main thrust. The main thrust should contribute little to the vertical motion because the dip angle is only about 3 –4 degrees below Middleton Island. However since Middleton Island is located very close to the up-dip end of the locked zone, as shown by the distribution of 1964 aftershocks, some of the vertical motion may be due to edge effects.

The coseismic vertical movements were orders of magnitude larger than any known preseismic ones; thus, preseismic motion was not considered to be of consequence. However, Shennan et al. (1999) recently documented evidence for preseismic subsidence from a study of microfossil assemblages along Turnagain Arm. Plafker (1972) also discussed the recent Holocene record of shoreline movements. The record is quite complex. A large number of shoreline samples have radiocarbon dates of less than 1000 years before the 1964 earthquake and thus may be associated with preseismic and interseismic deformation.

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