可从美国全国地球物理和太阳—地球资料中心得到极长周期的数字化地震记录,这些记录是由国际加速度仪布署计划(InternationalDeploymert of Acceleromelers Program)收集的。该计划是采用拉柯斯特数字记录重力仪组成的一个世界台网,它是由圣地亚哥的加利福尼亚大学在许多外国研究机构赞助下管理的。国际加速度仪布 Digitized seismic records of very long durations can be obtained from the National Geophysical and Solar Earth Data Center of the United States and collected by the International Development Missile Program (InternationalDeploymert of Acceleromelers Program). The program is a world wide web of LaCoster digital recording gravimeters that was administered by the University of California, San Diego under the auspices of many foreign research institutions. International Accelerometer cloth