Millions on Coast Ignore Peril of a Cataclysmic Quake
S Blakeslee article on pub reactions to possible future quakes, following Feb major quake; notes rept on disaster, just issued by Natl Geological Survey and Natl Oceanic and Atmospheric Adm, warns 'quakes will surely be as much a part of Calif's future as they have been in past'; discusses theories of experts linking causes of quakes to series of faults, especially San Andreas fault; some observations and recommendations made by Geological Survey and Natl Oceanic and Atmospheric Adm listed; illus; charts showing series of faults and data on past quakes