During the Haiyuan earthquake(Ms=5.5) the tilt step was observed by six tilt stations in the 260km range around the epicentre. The tilt step isogram was a rather regular ellipse. The direction of long axis of the ellipse was NW-SE. Decrease law of the tilt step value was clear. The value was the greatest near the epicentre. The high value area was a stripe-belt shape that was distributed in the direction of NW-SE and was in agreeing with the long axis of the innermost isoseismal line, the strike of geologic structure lines and the result of the mechanism of the earthquake foci. Therefore, the tilt step is the reflection of fault activities in the earthquake. The high value area can be regarded as a basis for our inference of earthquake fault.
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刘光远.海原5.5级地震时的倾斜突变[J].地震工程学报,1984,6(1):32-37. Liu Guang-yuan. THE TILT STEP IN THE HAIYUAN EARTHQUAKE (Ms=5.5)[J]. China Earthquake Engineering Journal,1984,6(1):32-37.