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Replication of ice crystals with vapor of methyl 2-cyanoacrylate has produced evidence of whiskers on them; an additional mechanism for the necessary multiplication of ice crystals in the atmosphere is suggested. This replication technique also confirms crystal clustering in the atmosphere and appears to confirm the distribution of electrical charge on ice crystals.

Seismic and echo sounder profiles in the aftershock region of the 1964 Alaskan earthquake define a pre‐existing zone of discontinuous faults in the area of maximum aftershock strain release. Steep reverse faults and possibly other types of steep faults occur in the zone; surface rupture has probably not been continuous along its full length during any Recent earthquake. The fault zone may represent a narrow area of maximum flexure and uplift in the broader area deformed during the 1964 earthquake. An anticline at the continental margin with local large structural relief was also uplifted during the earthquake.