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Unfortunately , current geodetic networks woefully undersample the deformation field , especially in terms of spatial distribution . Keep the bush fairly open by cutting out any weak , old stems that no longer produce strong young wood at ground level . The recent Kobe earthquake in Japan hints at the magnitude of disaster when a large earthquake strikes an urban center . You should prune established currant and gooseberry shrubs to encourage vigor and fruit production , improve sun penetration into the bush , and maintain good air circulation to minimize disease . These conditions occur when plants are grown in crowded , damp , or shaded locations , where air circulation is poor , or when cool night temperatures follow warm days . The objectives of pruning are to remove dead and diseased wood , shape the bush , maintain an adequate number of vigorous main stems to prevent overbearing , and to stimulate new shoot growth . These conditions are most likely to occur with houseplants indoors in late winter or early spring , especially during cloudy weather . It is playing an increasingly important role in emergency management and disaster relief activities and offers the potential for much improved efficiency .