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Study On Neotectonic Stress Field And Present Tectonic Stress Field In The Hunhe Fault Belt And Its Adjacent Areas

Hou Zhihua1 Zhong Nancai2 Hou Yukun2 Zhao Jianrong1(1 Institue of Crustal Dynamics,SSB,Beijing 100085;2 Institute of Disaster-Prevention Science and Technology,Sanhe,Hebei 065201)  
This paper presents a comparison analysis on the drainage pattern,tectonic joint,focal mechanism in the Hunhe fault belt and its adjacent areas.It is suggested that there are south and north areas separated by active fault and active tectonic.The direction of principal compression stress is identical,due to the same geologic structure.The direction of principal compression stress is NEE since late Tertiary period in the areas.The results of geological dating of fault gauges along the Hunhe fault zone by thermoluminescent method indicate that the absolute ages of fault activation which produced thermoluminescent effect on the fault gauge are pretty old:261.95±26.05ka.B.P.for the sample in the Funshun First Refinery west of Fushun downtown and 693.0±84.25ka.B.P.for the sample on the eastern margin of downtown(both there corresponds to the middle stage of middle Pleistocene);80.53±16.11ka.B.P.,57.28±11.46ka.B.P.,44.7±3.6ka.B.P.,respectively for the sample furtherly eastward(all of them respond to late Pleistocene).That means the Hunhe fault zone is not an active one as defined by the seismotectonic and engineering-geological circles.
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