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2013年4月20日,在青藏高原东缘的龙门山断裂带的南段发生了芦山7.0级地震.通过地壳剪切波分裂的分析,揭示了龙门山断裂带域的地壳主压应力方向及其与断裂之间的关联.芦山地震余震的定位结果显示,芦山地震的破裂与汶川地震的破裂没有贯通,在芦山与汶川之间形成了一个“破裂空段”.本文建议,应关注芦山地震与汶川地震之间“破裂空段”的应力变化.采用不依赖于天然地震记录的井下人工源观测技术是一种有意义的科学尝试.
On April 20, 2013, a magnitude 7.0 Lushan earthquake occurred on the southern segment of the Longmenshan fault belt on the eastern margin of the Qinghai-Tibet Plateau, revealing the crustal principal compressive stress direction and the Longmen Shan fault zone by analyzing the crustal shear wave splitting The correlation between the Lushan earthquake and aftershocks shows that the rupture of the Lushan earthquake and the rupture of the Wenchuan earthquake do not penetrate, forming a “broken space” between Lushan and Wenchuan.The paper suggests that attention should be paid to Stress changes in the “Cracked Segment” between the Lushan and Wenchuan Earthquakes It is a meaningful scientific attempt to adopt downhole artificial source observations that do not rely on natural seismic records.