一、事实通过对中国及世界一些地震带上强地震活动的分析,结果表明,这些地震不仅往返迁移、来回跳动,并且这种跳迁还具有“同步性”的特点。图1、图2给出了反映这一事实的部分结果(图中各地震带震例均等于或大于六级)。由图可见,在经向和纬向两类地震带上,地震的来回迁移几乎趋于“同步”:十九世纪末,经向带的震中迁向低纬,纬向带的震中迁向东部;本世纪初,经向带的震中 First, the fact Through the analysis of strong earthquakes in some seismic zones in China and the world, the results show that these earthquakes not only migrate back and forth and jump back and forth, but also have the characteristics of “synchronicity”. Figure 1 and Figure 2 show some of the results that reflect this fact. (All seismic belts are equal to or greater than six in the figure). It can be seen from the figure that in the meridional and latitudinal seismic belts, the migration back and forth of the earthquake tends to be almost synchronous. At the end of the nineteenth century, the epicenter of the meridional zone moved to low latitude and the epicenter of the zonal belt moved to the east. The beginning of this century, the epicenter of the epicenter