Their dynamics is the ground-stress change caused by the Earth rotation.
其动力主要来源于地球自转造成的地应力变化。
Change of ground stress influences pore pressure and oil potential, thus has a great influence upon oil migration accumulation.
地应力变化影响孔隙压力和油势，因而对石油运移和聚集有重要影响。
From the anomalous time and latitude determinations and the variation of ground water level, one may notice some regularities of the change of the tectonic stress field.
从测时测纬的异常形态和地下水的活动规律，可以分析出应力场变化的某些规律。
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