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2004•Journal of Seismological ResearchRequires access

Study on Geological Background of the Yumen Ms5.9 Earthquake in Gansu in 2002

HE Wen-gui

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Abstract

According to the field investigation, the macro-epicenter and the calculated-epicenter of M s5.9 earthquake on Dec 14, 2002 is located in Yumen area, where is the Qilian Mountain northern margin fault. The intensity of the meizoseismal region is VIII that is an ellipse with N65°W in long-axis direction and N25°E in short-axis direction, length of axes are 15km and 9km respectively. The causative fault is Hanxia-Dahuanggou sub-fault of Qilian Mountain northern edge fault. The aftershocks of Yumen earthquake concentrate in the neighbouring region of the fault.

About this research paper

What this paper is about

According to the field investigation, the macro-epicenter and the calculated-epicenter of M s5.9 earthquake on Dec 14, 2002 is located in Yumen area, where is the Qilian Mountain northern margin fault. The intensity of the meizoseismal region is VIII that is an ellipse with N65°W in long-axis direction and N25°E in short-axis direction, length of axes are 15km and 9km respectively. The causative fault is Hanxia-Dahuanggou sub-fault of Qilian Mountain northern edge fault. The aftershocks of Yumen earthquake concentrate in the neighbouring region of the fault.

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Available abstract

According to the field investigation, the macro-epicenter and the calculated-epicenter of M s5.9 earthquake on Dec 14, 2002 is located in Yumen area, where is the Qilian Mountain northern margin fault. The intensity of the meizoseismal region is VIII that is an ellipse with N65°W in long-axis direction and N25°E in short-axis direction, length of axes are 15km and 9km respectively. The causative fault is Hanxia-Dahuanggou sub-fault of Qilian Mountain northern edge fault. The aftershocks of Yumen earthquake concentrate in the neighbouring region of the fault.

Key concepts: Epicenter, Geology, Seismology, Aftershock, Fault (geology), Foreshock, Magnitude (astronomy), Seismic gap

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