Advances in Geophysics, Vol. 47 by Renata Dmowska

By Renata Dmowska

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

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Apparent sea level heights deduced from southcentral Alaska tide gauges. The data corrected for short-period fluctuations in sea level are shown as solid points. The solid lines show the least squares fit to the corrected data and the dashed lines connect the uncorrected data. The rates deduced from the least squares analysis are also shown. From Savage and Plafker (1991). CRUSTAL DEFORMATION IN THE SOUTHCENTRAL ALASKA 35 Fig. 15. Apparent sea level heights for the Kodiak and Cordova tide gauge sites.

The statement was written when its author was studying the large vertical motions associated with the earthquake. 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.

Lundgren et al. (1995) assumed that the Yakutat block moved with the Pacific plate, which caused their model to predict substantial contraction across the strike-slip Fairweather fault and inboard of it. However, the study was noteworthy as one of the earlier attempts to integrate space geodetic data and geologic data into a mutually consistent model of crustal deformation in Alaska. Piersanti et al. (1997) considered the effects of viscoelastic rebound to the 1964 earthquake on VLBI measurements between a site near Fairbanks in central Alaska and Whitehorse in northwestern Canada as well as with several other sites in Alaska, specifically Nome on the west coast, Kodiak Island, Sand Point, in the central Aleutians west of the rupture, Yakataga, in southcentral Alaska, east of the rupture zone, and at Sourdough, also in the interior of Alaska.

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