全球主要地震区中源和深源大地震的18．6年轮回

18.6 YEARS CYCLES OF LARGE INTERMEDIATE AND DEEP FOCUS EARTHQUAKES IN THE WORLD'S MAJOR SEISMIC REGIONS

分析全球中源和深源大地震与月球交点运动的关系，确定了１５个地区的中源和深源大地震有明显的１８．６ａ地震轮回。在这１５个地区中，除兴都库什地区外，其余地区的边界与俯冲带的分段性有密切关系。这一发现进一步证实了岩浆潮致上涌可调制地震活动的岩浆潮假设，并表明岩浆潮致上涌的影响范围在深部和浅部明显不同，中源和深源地震的发生很可能和岩浆上涌有关。

seismic regions in which large intermediate and deep focus earthquakes have significant 18.6 years cycle have been determined by analyzing correlation between the events and the tropic longitude of lunar ascending node. The boundaries of the 15 regions, except the Hindu Kush region, closely relate to segmentation of subducting slab. This discover further demonstrates the magma tide hypothesis that the tidal ascending of magma may modulate seismicity and shows that the effectiverange of magma upwelling are different in the shallow and the deep part of the earth.It is likely that the occurrence of intermediate and deep focus earthquakes relate to the upwelling of magma.