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RESEARCH ON THE SATELLITE REMOTE SENSING IMAGES INDICATIVE OF STRONG EARTHQUAKE PREPARATION IN THE ORDOS NORTH MARGINAL FAULT BASIN REGION

Jianhua Li

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Abstract

The information of tectonic movement in the earthquake-stricken areas of the 1979 M_S 6.0 Wuyuan earthquake, the 1989 M_S 6.1 Datong-Yanggao earthquake and the 1996 M_S 6.4 west Baotou earthquake are studied by using multi-phase and multi-channel satellite images. Furthermore, the geologic-tectonic background of these earthquakes is discussed by combining the obtained results with the existing seismic intensity investigation data. The results of this study show that the 1979 M_S 6.0 Wuyuan earthquake occurred at the convergence of the NE-trending Haiziyan Fault and the NW-trending west Wuyuan Fault, as indicated by tone difference and micro-morphologic features on satellite images. The long axis of the high intensity isoseism of this earthquake is NE-trending, consistent with the Haiziyan Fault, which is therefore assumed to be the seismogenic fault of this earthquake. The long axis of the low intensity isoseism of this earthquake is NW-trending, indicating the effect of the NW-trending west Wuyuan Fault. The 1989 M_S 6.1 Datong-Yanggao earthquake occurred on the NEE-trending Dawangcun-Xi'anquan Fault which extends from the hinterland of the Liulengshan Mountains to Datong-Yanggao basin, as indicated by micro-morphologic and tone differences on the satellite images. The fault is consistent with the long axis of the isoseism of this earthquake as proposed by Su Zong-zheng et al. The 1996 M_S 6.4 west Baotou earthquake occurred at the convergence of the Wulashan north marginal fault and the NW-trending Xinsheng Sand Yard Fault, as indicated by distinct scarp and groove landforms. The long axis of high intensity isoseism of this earthquake is NE-striking, sub-parallel to the NEE-trending Wulashan north marginal fault that is assumed to be the seismogenic structure of the west Baotou earthquake. The long axis of low intensity isoseism of this earthquake is NW-striking, which is considered to be the effect of the NW-trending Xinsheng Sand Yard Fault.

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What this paper is about

The information of tectonic movement in the earthquake-stricken areas of the 1979 M_S 6.0 Wuyuan earthquake, the 1989 M_S 6.1 Datong-Yanggao earthquake and the 1996 M_S 6.4 west Baotou earthquake are studied by using multi-phase and multi-channel satellite images. Furthermore, the geologic-tectonic background of these earthquakes is discussed by combining the obtained results with the existing seismic intensity investigation data. The results of this study show that the 1979 M_S 6.0 Wuyuan earthquake occurred at the convergence of the NE-trending Haiziyan Fault and the NW-trending west Wuyuan Fault, as indicated by tone difference and micro-morphologic features on satellite images. The long axis of the high intensity isoseism of this earthquake is NE-trending, consistent with the Haiziyan Fault, which is therefore assumed to be the seismogenic fault of this earthquake. The long axis of the low intensity isoseism of this earthquake is NW-trending, indicating the effect of the NW-trending west Wuyuan Fault. The 1989 M_S 6.1 Datong-Yanggao earthquake occurred on the NEE-trending Dawangcun-Xi'anquan Fault which extends from the hinterland of the Liulengshan Mountains to Datong-Yanggao basin, as indicated by micro-morphologic and tone differences on the satellite images. The fault is consistent with the long axis of the isoseism of this earthquake as proposed by Su Zong-zheng et al. The 1996 M_S 6.4 west Baotou earthquake occurred at the convergence of the Wulashan north marginal fault and the NW-trending Xinsheng Sand Yard Fault, as indicated by distinct scarp and groove landforms. The long axis of high intensity isoseism of this earthquake is NE-striking, sub-parallel to the NEE-trending Wulashan north marginal fault that is assumed to be the seismogenic structure of the west Baotou earthquake. The long axis of low intensity isoseism of this earthquake is NW-striking, which is considered to be the effect of the NW-trending Xinsheng Sand Yard Fault.

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Available abstract

The information of tectonic movement in the earthquake-stricken areas of the 1979 M_S 6.0 Wuyuan earthquake, the 1989 M_S 6.1 Datong-Yanggao earthquake and the 1996 M_S 6.4 west Baotou earthquake are studied by using multi-phase and multi-channel satellite images. Furthermore, the geologic-tectonic background of these earthquakes is discussed by combining the obtained results with the existing seismic intensity investigation data. The results of this study show that the 1979 M_S 6.0 Wuyuan earthquake occurred at the convergence of the NE-trending Haiziyan Fault and the NW-trending west Wuyuan Fault, as indicated by tone difference and micro-morphologic features on satellite images. The long axis of the high intensity isoseism of this earthquake is NE-trending, consistent with the Haiziyan Fault, which is therefore assumed to be the seismogenic fault of this earthquake. The long axis of the low intensity isoseism of this earthquake is NW-trending, indicating the effect of the NW-trending west Wuyuan Fault. The 1989 M_S 6.1 Datong-Yanggao earthquake occurred on the NEE-trending Dawangcun-Xi'anquan Fault which extends from the hinterland of the Liulengshan Mountains to Datong-Yanggao basin, as indicated by micro-morphologic and tone differences on the satellite images. The fault is consistent with the long axis of the isoseism of this earthquake as proposed by Su Zong-zheng et al. The 1996 M_S 6.4 west Baotou earthquake occurred at the convergence of the Wulashan north marginal fault and the NW-trending Xinsheng Sand Yard Fault, as indicated by distinct scarp and groove landforms. The long axis of high intensity isoseism of this earthquake is NE-striking, sub-parallel to the NEE-trending Wulashan north marginal fault that is assumed to be the seismogenic structure of the west Baotou earthquake. The long axis of low intensity isoseism of this earthquake is NW-striking, which is considered to be the effect of the NW-trending Xinsheng Sand Yard Fault.

Key concepts: Geology, Seismology, Fault (geology), Intraplate earthquake, Seismic gap, Tectonics, Structural basin, Satellite

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RESEARCH ON THE SATELLITE REMOTE SENSING IMAGES INDICATIVE OF STRONG EARTHQUAKE PREPARATION IN THE ORDOS NORTH MARGINAL FAULT BASIN REGION — Research Paper | ScholarLens