The faults

mainly the NE

secondly the EW and NW

intersect the crustalong the coasts of Guangdong to form seven fault blocks with different activeintensity and twenty sub-fault blocks with different stability.The recent crus-tal movements on these fault blocks are dominated by vertical differential mov-ements.The geotherm-seismicity effect and energy-facies conversion of the fault-bl-ocks processes along the coasts have a close relationship with the deep-seatedtectonics.The recent fault-block subsidence areas with stronger earthquake andlower geotherm value are not only corresponding to the deep-seated uplift areaof the Conrad and Mohorovicic discontinuities

but it is also a area of highergravity value.The strong earthquakes of M>6 in Guangdong were all takingplace on the boundaries of the recent fault-block subsidence areas where thecrustal movements along the coast are stronger and the reginal stabilities arelower.The distribution of fault-block stress field and the style of the fault move-ment are different with the pattern of the block complex and the direction ofthe main stress in regional tectonic stress field.The regional stability is also influnced by the medium of the fault-blocks

the conditions of tectonic

the development of tectonic and the characteristic ofhydrogeology and engineering geology.There were about 70 percent earthquakesof M≥4(3/4) along the coasts took place in Cenozonic graben basins.