IASPEI/UNESCO历史地震图和地震工作小组与历史地震图缩微计划地震图含有震源和地球内部构造的大量信息,是地震学和地球物理学研究的重要资料来源。地震图是在遍布世界各地的地震台站记录到的,仪器类型、记录格式不尽一致,资料的保管和使用也不统一,这些都给地震学家充分利用这些资料造成相当大的困难。时常是为了得到一张重要的地震图要花费很多时间和精力。随着地震学的发展,台站仪器标准化,地震 IASPEI / UNESCO Historical Seismograms and Seismic Work Teams and Historical Seismic Microfilming Plans Seismic maps contain a wealth of information on hypocenters and the earth’s interior and are important sources of information in seismology and geophysics. Seismograms are recorded by seismic stations all over the world. The types of instruments and recording formats are different, and the data are not kept and used uniformly. All these have caused considerable difficulties for seismologists to make full use of these materials. Often it takes a lot of time and effort to get an important seismogram. With the development of seismology, station equipment standardization, earthquakes