????????????????????????8.1????????????

??????????????????????????仯?????????????????????????? ????????????????????,?????????С?????????????????????????????á??й?????????????硱?????????400???GPS?????????????1999??\,2001???2004?????????????????1999~2001?????????????仯??2001~2004???????1999~2001????????????仯???????????1)????????????????????????????ε????????????????????????2)?????????ε??????????????????????3)2001???????8.1????????????????????????ο?????????????????????????????????????????????4)???????????2001???????8.1???????????????????????????????????????????????????????????????????????????????????????????????

POSSIBLE RELATION OF HORIZONTAL MOVEMENT FIELD IN NORTH CHINA TO KUNLUN MOUNTAIN Ms8.1 EARTHQUAKE

In order to have a good grasp of the space time variation trend of regional strain field on the whole and describe regional movement field more vividly, on the basis of the region with no rotation,by use of the repeatedly measured GPS data(in 1999,2001 and 2004) come from more than 400 GPS monitoring stations in North China in the Project of “China Crust Movement Measuring Network” , the space variation of horizontal movement field during 1999-2001 in North China and the distinction of variations of horizontal movement field during 2001-2004 in contrast with that during 1999-2001 are analyzed with continuous strain model focused on extracting medium low frequency strain information. The results show that firstly, the uneven strains in North China are obvious, results in different periods are distinct from each other on space; secondly ,the movements of former and latter periods are inconsistent obviously; thirdly, Kunlun Mountain Ms8.1 earthquake in 2001 may act as the main role in controlling the variation of crustal deformation in North China , and cause an obvious extension along the EW direction; fourthly, as a whole, Kunlun Mountain Ms8.1 earthquake in 2001 decreased and released the accumulated energy in North China to a certain degree . North China may not enter into strongly seismic activity period soon because there has not been the enough condition yet.