加里福尼亚州在1971年制定了一项法令,要建立一项全州性的强震观测计划,以确保本州的强震仪在分布上应有足够的科学根据。这项法令规定强震仪应设置在具有代表性的地质环境和结构上,还 California passed a decree in 1971 to establish a statewide strong earthquake observation program to ensure that the state’s seismographs should be sufficiently scientific in their distribution. This decree stipulates that the seismograph should be set up on the representative geological environment and structure