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秦嶺造山帶及鄰區(qū)雙差層析成像

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關(guān)鍵詞雙差層析成像;秦嶺造山帶;漢中盆地;地殼速度結(jié)構(gòu)中圖分類號(hào):P315.2 文獻(xiàn)標(biāo)識(shí)碼:A 文章編號(hào):2096-7780(2025)05-0249-10doi:10.19987/j.dzkxjz.2024-163

AbstractThe Qinling orogenic belt and its adjacent areas serve as the convergence zone between the North China craton,the Yangtze craton,andthe northeastern edge ofthe Qinghai-Xizang Plateau are characterized bycomplex tectonic activity.This studyutilizes observational data from 159 fixed stations ofthe ChinaEarthquake Administration in Shaanxi, Sichuan,Gansu,andotherregions,as wellas182broadband mobile stations from the ChinArrayI project.Weobtained athre-dimensional velocitystructureof the Qinling orogenicbeltand itsadjacent areas byemploying the doubledifferencetomography method.Theimaging resultsreveal that the crustal thicknessof the Hanzhong basin is approximately 38km ,and the Moho interface exhibits a dome-like shape, convex in the center and concave on both sides. Additionally,a significant low-velocity anomaly is observed along the northern edgeof the western Qinling orogenic belt and the southern side of the Longxian-Baoji fault zone, extending to a depth of approximately 39km This anomaly is associated with the eastward flow of materials from the middle and lower crust of the Qinghai-Xizang Plateau.

Keywordsdouble-difference tomography; Qinling orogenic belt; Hanzhong basin; crustal velocity structure

0 引言

秦嶺造山帶位于青藏高原、華北塊體、揚(yáng)子塊體交匯地帶,同時(shí)與大巴山造山帶、摩天嶺地塊相交匯。(剩余14452字)

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