Word: occurs
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Dates: during 1970-1979
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...Carolina. When completed and computerized, these networks will provide two warnings of impending quakes. If scientists detect changes in P-wave velocities, magnetic field and other dilatancy effects that persist over a wide area, a large quake can be expected-but not for many months. If the dilatancy effects occur in a small area, the quake will be minor but will occur soon. The return to normal of the dilatancy effects provides the second warning. It indicates that the quake will occur in about one-tenth the time during which the changes were measured. If dilatancy changes have been recorded...
Once in operation, an earthquake warning system will bring with it a new set of problems. If a major quake is forecast for San Francisco, for example, should the Government shut down businesses and evacuate the populace? Where would evacuees be housed? If the quake does not occur, who will be responsible for the financial loss caused by the evacuation? Answers come more easily in totalitarian China. There, says Press, "if an actual quake does not take place, it is felt that the people will understand that the state is acting on their behalf and accept a momentary disruption...
...earthquake struck an industrialized area in Liaoning province. According to the Chinese publication Earthquake Frontiers, at 6 p.m. that day an announcement was made over the public-address system in the Kuan-t'un commune: "According to a prediction by the superior command, a strong earthquake will probably occur tonight. We insist that all people leave their homes and all animals leave their stables." As an added incentive for people to go outside, the commune leaders also announced that movies would be shown in an outdoor location...
...panic and economic paralysis, thus resulting in more harm than the tremors themselves. Forecasting would clearly save lives, the panel states, and that is the "highest priority." Because most casualties during a quake are caused by collapsing buildings, the report recommends stronger building codes' in areas where earthquakes occur frequently, the allocation of funds for strengthening existing structures in areas where earthquakes have been forecast and even requiring some of the population to live in mobile homes and tents when a quake is imminent. Fearful that forecasting could become a political football and that some officials might...
...scientists now estimate that the change can occur as long as ten years before a magnitude 8 quake, a year before a 7-pointer and a few months before a magnitude...