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 impact on cloud improvement are provided. the second one subject is earthquakes and seismological mapping. The authors current their study concerning predicting the positioning and depth of earthquakes.

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Vertical Motion Measured at Tide Gauges Brown et al. (1977) examined crustal uplift as indicated by tide gauge stations at Seward, Seldovia, St. Paul’s Harbor (Kodiak), and Cordova as well as Anchorage, but the deduced rates are suspect due to the limited time span and the noisy observations (as we hinted earlier). A longer set of tide gauge data was used by Savage and Plafker (1991). They analyzed sea-level observations at seven southcentral Alaska sites (Anchorage, Kodiak Cordova, Seldovia, Seward, Nikiski, and Valdez) that were affected by the 1964 earthquake; five southeast Alaska sites (Juneau, Ketchikan, Sitka, Skagway, and Yakutat) that were unaffected by the earthquake; and one southwest site (Sand Point) that was also unaffected by the earthquake.

This model also placed the fault at much greater depths than indicated by the most reliable studies of the PWS earthquake. Other model 50 COHEN AND FREYMUELLER CRUSTAL DEFORMATION IN THE SOUTHCENTRAL ALASKA 51 parameters are also somewhat questionable in view of what is now known both about the geometry of the interface and the parameters of the earthquake. The contemporary horizontal crustal velocities observed in the vicinity of the Kenai Peninsula and Kodiak Island have been discussed in the previous section.

This second estimate is closer to the geological estimate, as we will summarize later, but might still be low if some of the convergent motion between North America and the Pacific is accommodated aseismically. 26 COHEN AND FREYMUELLER These recurrence times are based on a simple time-predictable model in which the recurrence time is the coseismic slip divided by the interseismic velocity. This model is almost certainly oversimplified, but is commonly used to help interpret geodetic observations.

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