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根据近垂直反射原理对秦岭和大巴山结合部位的深地震反射测线上的5个大药量的反射大炮进行静校正、去噪、速度求取、CDP分选等处理获得沿深地震反射测线的大炮单次覆盖剖面.单次剖面和原始单炮数据结果初步显示:深地震反射测线最南端TWT 16 s处存在地幔反射,该地幔反射界面向北可以追踪到凤凰山下TWT 18.5 s.地幔反射在原始大炮数据表现为信噪比较高的连续震相.莫霍面反射在凤凰山南10km,TWT在16 s,从该处向南莫霍面震相难以识别,不能追踪;从该处向北,莫霍面反射可连续追踪,界面变化平缓、南深北浅,在测线最北端莫霍面反射TWT 14.2 s.初步认为测线最南端的地幔反射为扬子板块向北俯冲证据.
According to the principle of near vertical reflection, five large quantities of reflected cannons on the deep seismic reflection line at the junction of Qinling and Daba Mountains are processed by static correction, denoising, velocity calculation and CDP sorting, The results of the single-section and the original single-shot data show that there is a mantle reflection at TWT 16 s at the southernmost tip of the deep seismic reflection line, and the mantle reflection interface can be traced to the north of the Phoenix Mountain for 18.5 s northward. The mantle reflections at the original cannon show a continuous phase with a high signal-to-noise ratio. The Moho reflections are about 10 km south of the Fenghuangshan Mountain and the TWT is 16 s, from which the seismic phase of the south Moho is difficult to recognize and can not be traced. At the north, the Moho reflections can be continuously tracked, the interface changes gently, the south is deep and the north is shallow, and the TWT is reflected for 14.2 s at the northernmost Moho.It is preliminarily believed that the mantle reflections in the southernmost part of the survey line are evidence of the northward subduction of the Yangtze plate .