我国是世界上遭受自然灾害最严重的国家之一。随着经济的快速增长，我国因灾害造成的经济损失呈指数增长。自然灾害在某种程度上已成为制约我国经济持续、稳定、协调发展的重要因素。为此，最大限度地防灾减灾的课题已刻不容缓地摆在广大科技工作者面前。依靠科学技术是防灾减 Our country is one of the countries in the world suffering the most from natural disasters. With the rapid economic growth, the economic losses caused by disasters in our country show an exponential growth. To some extent, natural disasters have become an important factor that restricts the sustained, stable and coordinated development of our economy. To this end, the issue of maximum disaster prevention and reduction has been placed without delay in front of the vast number of scientists and technicians. Rely on science and technology is disaster reduction