在板块边缘的冲撞地区重力场的求定

ON GRAVITY FIELD DETERMINATION IN THECOLLISION AREA BETWEEN BOUNDARIESOF THE TECTONIC PLATES

在陆地上，板块边缘的冲撞地区一般都是呈现地形复杂、地表和地下的质量分布不均衡、有强烈的地壳运动和构造运动，因此，该地区的重力场（重力异常、垂线偏差、大地水准面）变化剧烈，对它的归算和推估都需要作特殊的考虑。本文以位于欧亚板块和印度板块边缘冲撞地区的珠穆朗玛峰测区的重力场求定为例，进行讨论。

:In the continental collision areas between boundaries of the tectonic plates,in general, topography is rough, mass distribution above and under the geoid isimisostastic, crust and structure movement are strong. Naturally the variationand structure of the local gravity field (gravity anomalies, deflections of thevertical and geoid) in these areas are very complicate. Hence some special tech-niques are necessary for the gravity reduction and prediction in the areas.The techniques and experiences for the gravity field determination in Mt.Everst area, located in the collision area between boundaries of the Eurasianand lndian plates, are taken as a study case to be discussed in the paper.