气压变化对石英弹簧重力仪读数的影响

根据我们在低压仓中对国产ZSM—Ⅲ型(简称Z)、美国Wodnre(简称W)及加拿大Scintrex CG—2型(简称C)8台重力仪进行气压实验的结果,气压变化和重力仪读数呈极好的线性关系,但每台仪器有不同的回归系数,因此在以地震预报为目的的高精度重力测量中,应该对野外观测的结果进行气压改正。用高差所建立的重力基线场的数值是否准确有进一步考虑的必要。

INFLUENCE OF ATMOSPHERIC PRESSURE UPON QUARTZ GRAVIMETER

The gravimeter''s quartz system is in air-tight sealea cases, used to be considered no pressure effects.The present experiment with 8 quartz gravimeter(2 Scientrex CG-2, 3 ZSM-3, 3 Worden)indicate that there is significant reletivity between the pressure variation and the reading of gravimeters, but the gravimeters have different regression coefficients. It is necessary to correct the pressure effect from gravity measurement result.The authors wonder if there is a better method than calibrating gravimeters by gravity difference caused by altitude difference.