RESEARCH ON THE RELATIONSHIP BETWEEN FRACTAL FACTORS AND TECTONIC ACTIVITY——A CASE STUDY OF SOUTHWESTERN YUNNAN BLOCK

doi:10.3969/j.issn.0253-4967.2016.04.005

Abstract

Abstract:

Geomorphology could record long-term accumulation of tectonic movement and quantify it by relevant parameters.But because the influences of other factors such as climate and lithology,how to use the relevant parameters to reveal the relationship between geomorphology and tectonics is a research hot spot.In this paper,we utilize the variogram method and the cellular fractal model to estimate parameters such as the fractal dimension (D) and ordinate intercept (γ) from the SRTM3 DEM using a moving window operation.We compare the distribution characteristics of the parameters in different climate and lithology.The results indicate that the correlation between the parameters and lithology or climate is very poor.The fractal dimension (D) reveals a very good correlation with tectonics,which is low in tectonically inactive areas and high in active areas.It implies that fractal dimension (D) may be a new method for research of regional tectonic movement.

Key words: fractal factors, tectonic activity, southwestern Yunnan block

摘要：

构造地貌能够记录构造运动的长期积累，并能通过相关参数定量表达。但是，由于地貌还受到气候和岩性等因素的影响，所以如何利用相关参数来表达地貌与构造之间的关系是一个研究热点。文中利用水平分辨率为90m的SRTM数据，采用元分维模型，通过变差函数法计算了滇西南地区的二维分形参数。并对比了在不同岩性不同气候条件下分形参数的分布特征。结果显示，二维分形参数与岩性、气候因素相关性不强。而分维值与构造活动因素相关性很好，在构造活动强烈区域分维值较低，在构造活动不强烈区域分维值较高。这说明分维值能在一定程度上反映构造活动的强弱，为研究区域构造活动提供了一种新的手段。

关键词: 分形参数, 构造活动, 滇西南块体

CLC Number:

P315.2

SHI Feng, HE Hong-lin, Alexander L Densmore, BI Li-si, WEI Zhan-yu. RESEARCH ON THE RELATIONSHIP BETWEEN FRACTAL FACTORS AND TECTONIC ACTIVITY——A CASE STUDY OF SOUTHWESTERN YUNNAN BLOCK[J]. SEISMOLOGY AND GEOLOGY, 2016, 38(4): 862-873.

石峰, 何宏林, Alexander L Densmore, 毕丽思, 魏占玉. 二维分形参数与构造活动关系研究——以滇西南块体为例[J]. 地震地质, 2016, 38(4): 862-873.

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