这个基于牛顿力学的公式是正确的，你缺课了。

我想知道的是，要不要考虑GR。

I know nothing about GR, let alone its usage.

http://earthquake.usgs.gov/learning/faq.php?categoryID=6&faqID=109

引用：

The stresses induced in the earth by an extraterrestrial mass are proportional to the gravitational field gradient dg( r ) / dr
and NOT to the gravitational field g( r ).

g( r ) = GMm / r^2

thus:

dg( r ) / dr = -2 * g( r ) / r = -2GMm / r^3