CORRELATION-ANALYSIS OF THE RUNOFF OF THE RIVERS AND THE SEIMS IN CHINA

In recent hundred years the annual discharge variations of the Changji ang River (represented by the Yichang station) and the Huanghe River ( represented by Shanxian and Tangnaihe, respectively) have closely rela ted to the geographical distribution of the earthquakes coming about i n China in the same year. Both the occurrence of the destructive seism or seismic swarm in the river basins and the disappearance of the sho cks in the east and south of the basins are the conditions that the Ch angjiang and Huanghe Rivers are the high flow while that the strong ea rthquake of magnitude 7 or more occurred in North China is the conditi on for the Changjiang low flow year and that of 6 or more in the Qilia n Mountains area is for the Huanghe River. In the latter part of this paper, a 2-year sample is given to explain that the conditions of the 2 rivers being high flow years are that the north-south seismic belt i s active and in the meanwhile no seism occurred in South China, and th ose of the low flow year are that the strong quake(s) occurred in the north and south of China and quiet in the north-south seismic belt. Th e analysis indicates that the seismically active area is in general co nsistent with the high value of soil temperature anomalies at the dept h of 3.2 m, which may help to explain the physical relationship betwee n the seism and the precipitation field.