海水加载引起的厦门台相对重力变化  

Relative Gravity Variation Caused by Seawater Loading at Xiamen Seismostation

作　　者：熊先保[1] 杨婕[1] 林立峰[1] 黄晓华[1] 徐智明[1] 

机构地区：[1]福建省地震局厦门地震台,福建厦门361003

出　　处：《华南地震》2012年第2期59-65,共7页South China Journal of Seismology

基　　金：福建省地震局青年学术骨干基金

摘　　要：针对厦门台具体地理位置的特点,提出了计算相对重力变化的海水加载模型,运用有关弹性理论知识与一定的数学方法,定量地计算了海水加载引起的厦门台相对重力变化。结果表明:①相对重力变化对近距离的加载极为敏感,随着离观测点距离的增加,加载的影响程度逐渐减弱,超过一定的范围,这种影响就可以忽略不计了;对厦门台来说,海水的有效加载范围约为940 m;②经过扣除各种可能的误差后,由理论模型计算所得的结果与实际观测结果较为吻合,进一步证实了计算模型的正确性。In view of the characteristics of the concrete geographic position of Xiamen Seismostation,the Paper proposes a seawater loading model to calculate the relative gravity variation,and via relevant theories of elasticity and some mathematical methods,computes the relative gravity variation caused by sea water loading in Xiamen Seismostation quantificationally.The results show that： ①The relative gravity variation is extremely sensitive to close distance loading,and the impact of loading weakens gradually with the increase of distance,and may be neglected in excess of a certain range;for Xiamen seismostation,the effective sea water loading range is about 940m;②.After deducting various possible errors,the result calculated from the theoretical model is consistent with the practical observation result,which further proves the validity of the calculation model introduced in this Paper.

关 键 词：海水加载 相对重力变化 理论模型 有效加载范围 厦门台 

分 类 号：P315.4[天文地球—地震学]