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RECENT VARIATION CHARACTERISTICS OF GRAVITY AND STRAIN FIELDS WITHIN MIDDLE REGION OF SHAANXI

The recent(from 2001 to 2005) gravity and local GPS strain data in the middle region of Shaanxi are analysed.These data show that:1)both gravity and strain fields were coincidently rising in the west and the south,dropping in the east and the north;2)the gravity and maximal shear strain values along the arcuate fault belt of south-western Ordos were high and positive,and controlled by compress field,but the gravity value was negative and the maximum shear strain value was high in the middle-eastern area,especially,near the Kouzhen-Guanshan faults,where it was controlled by extensional plane strain field.