This means the index can dip below 2600 and then rebound back upwards into the consolidation band area.

The short term GMMA moves above the long term GMMA and USES the upper edge of the long term GMMA as a rebound support area.

Based on the elastic rebound theory, an analysis method is proposed in this paper, And the data of relevellings from 1969 to 1975 around the Tangshan area are processed as an example.