No anomalous local secular geomagnetic variation has been found in the area.
测区内未发现有局部地磁长期变化异常。
2
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。
3
The daily mean variation maps show that a pronounced anomalous phenomenon existed on the curves of fluid compositions in mud of the CCSD main hole before and after the earthquakes.