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1936年4月1日广西灵山发生6(3/4)级地震(灵山地震),为华南沿海地震带内陆地区自有地震记载以来发生的最大地震;目前为止,未见与该地震有关的地表破裂报道和研究。在防城-灵山断裂带NE段寨圩断裂高塘—夏塘—六蒙、蕉根坪—合口等地新发现至今依然保留完好的地震地表破裂带,在华南中强震构造区尚属首次。野外调查表明,该地震地表破裂带全长约12.5km,在罗阳山前总体呈NE向展布,主要表现为地震陡坎、张裂缝、右旋错移冲沟水系等,地表破裂特征及断错地貌情况显示出该地震地表破裂性质为右旋走滑兼正断。探槽揭露该断裂至少存在3次地震事件,其中2次为古地震事件,最新1次为灵山6(3/4)级地震。这次地震地表破裂带的发现,对灵山地震发震构造的探测具有重要的科学意义。
On April 1, 1936, an earthquake of magnitude 6 (3/4) occurred in Lingshan, Guangxi Province (Lingshan Earthquake), the largest earthquake ever recorded since its own inland in the southern China coastal seismic zone; so far, no such earthquake has been reported Surface rupture reports and studies. In the Fangcheng-Lingshan fault zone NE segment Zhaixu fault Gao Tong -Xiangtang-Liu Meng, Jiaoguping-Hankou, etc. Newly discovered and still preserved intact seismic surface rupture zone, is the first time in the southern China temperate tectonic zone . Field surveys show that the total length of the surface rupture zone of the earthquake is about 12.5km, and the distribution of the surface rupture zone is generally NE-trending in front of the Luoyang Mountains, mainly including the seismic scarp, the Zhanggou fracture, the dextral drift gully and other faults, The faulty topography shows that the surface rupture nature of the earthquake is right-lateral strike-slip and normal off. The trenches revealed that there were at least three seismic events in the fault, of which two were paleoearthquakes and the last one was 6 (3/4) Lingshan earthquakes. The discovery of the surface rupture zone of the earthquake has important scientific significance for the detection of the seismogenic structures of the Lingshan Earthquake.