地貌形态指数反映的青藏高原东北部宛川河流域新构造活动

doi:10.11821/dlxb201603005

Abstract

Abstract:

Wanchuan River, located in the northeastern Tibetan Plateau, is one of the tributaries of the Yellow River. This area has witnessed many earthquakes of magnitude 6 on the Richter scale. Based on DEM data, this paper discussed the characteristics of neotectonic activity by analyzing the drainage networks and calculating geomorphic indices. It turns out that the mountain front sinuosity index is between 1.03 and 1.18 to the north of Wanchuan River (NWR) and from 1.83 to 2.88 in Xinglong Mountain (XLM); while the valley floor height-to-width ratio index is about 0.36-2.34 in NWR while it ranges from 0.55 to 13 in XLM. The values and distribution of the mountain front sinuosity index and the valley floor height-to-width ration indicate that neotectonics are still active in the study area, and the movements in the north of Wanchuan River catchment are more active. The abnormal AF index in the southeast part means that there should be tilted fault block and folds in the northwest of Wanchuan River catchment. There exists a strike-slip fault in the southeast of the northern Wanchuan River valley, indicated by analyses of the distribution of knickpoints and off-set valley.

Key words: geomorphic indices, river longitudinal profiles, regional tectonic, fault, Wanchuan River

Yan DAI, Xianyan WANG, Shengli WANG, Yiquan LI, Huayu LU. The neotectonic activity of Wanchuan catchment reflected by geomorphic indices[J].Acta Geographica Sinica, 2016, 71(3): 412-421.

Figures/Tables 7

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兴隆山北		宛川河北
SMF	VF	SMF	VF
1.83	0.55	1.03	0.36
1.86	1.97	1.08	0.38
2.10	1.90	1.09	0.44
2.21	2.11	1.09	0.47
2.60	4.18	1.13	0.51
2.88	5.09	1.14	0.54
	7.71	1.17	0.59
	8.46	1.18	0.65
	11.86		0.65
	13.00		0.81
			0.88
			1.06
			1.05
			2.34

The neotectonic activity of Wanchuan catchment reflected by geomorphic indices

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