## 3 Results
### Edge Recognition on Wavelet Transform Details
Additionally, crustal discontinuities in the Himalayan tectonic zone are more evident than those in northern Tibet. Only the KKF, ATF and QNF exhibit certain extents of structural discontinuities. In addition, the Anyimaqen-Kunlun-Muztagh suture zone (AMS) between the Qaidam basin and the Tibetan Plateau is partly evident. The values of THD along the N-S-trending normal faults in the mid-Himalayas decrease, except for those in the crust west of the GM and east of the SNF. In eastern Tibet, the crustal discontinuities of the EHS are as evident as those of the WHS. The NJF is still obvious. Figure 4: Distributions of the total horizontal derivatives at 2.5 km depth. The faults’ names are listed here. Altryn Tagh fault (ATF), Apalong fault (AplF), Chaman fault (CF), Gaoligong fault (GlgF), Herat fault (HF), Haiyuan fault (HyF), Jiali fault (JIF), Talas-Fergana fault (TF), Karakash fault (KKF), Karakorum fault (KF), Kashgar-Yecheng transfer system (KYS), Nujiang fault (NjF), Nantinghe fault (NthF), Sagaing fault (SF), Sarez-Karakul fault (SKF), Xianshuilhe fault (XshF); Burmese fold belt (BFB), Longmenshan thrust (LmsT), Main Central thrust (MCT), Main Frontal thrust (MFT), Pamir thrust system (PTS), Qilian Nanshan thrust (QNT), Southern Tian Shan thrust (STT); normal faults and extensional structures: Gurla-Mandhata detachment (GM), Sangri-Nacuo fault (SNF), Yadong-Gulu fault (YGF); Anyimaqen-Kunlun-Muztagh suture zone (AMS), Bangonghu-Nujiang suture zone (BNS), Jinshaiang suture zone (JS), Rushan-Pshart suture zone (RE), Shyok suture zone (SSZ), Yalu-Zangbo suture zone (YZYS). The area with maximum THD values in the Pamir Plateau disappears in Figure 6. The current depth is close to the crystalline basement of the plateau. This indicates that the crustal materials of the basement are relatively intact. The areas with maximum THD values are mostly distributed around the WHS and SSZ. The distribution of the maximum THD values in the Himalayan tectonic zone is relatively homogeneous. The differences in crustal discontinuities among the western, middle and eastern Himalayas are not as obvious as those in the overlying crust. The GM and the southern segments of the N-S-trending normal faults exhibit significant crustal discontinuities. In addition, the southern end of the YGF and its eastern structures, such as the YZYS, SNF and MCT, exhibit evident crustal discontinuities. The THD values along the JIF and ApLF near the EHS decrease, and only the frontal great bend of the YZYS exhibits a degree of crustal discontinuity. In eastern Tibet, the areas with maximum THDs are distributed discretely at almost the same latitude as the NJF. Further, crustal discontinuities in the western crust of the LmsT are obvious. Figure 5: Distributions of the total horizontal derivatives at 6.5 km depth. The faults’ names are listed here. Altryn Tagh fault (ATF), Apalong fault (ApLF), Chaman fault (CF), Gaoligong fault (GlgF), Herat fault (HF), Haiyuan fault (HyF), Jiali fault (JIF), Talas-Fergana fault (TF), Karakash fault (KKF), Karakorum fault (KF), Kashgar-Yecheng transfer system (KYS), Nujiang fault (NjF), Nantinghe fault (NthF), Sagaing fault (SF), Sarez-Karakul fault (SKF), Xianshuithe fault (XshF); Burmese fold belt (BFB), Longmenshan thrust (LmsT), Main Central thrust (MCT), Main Frontal thrust (MFT), Pamir thrust system (PTS), Qilian Nanshan thrust (QNT), Southern Tian Shan thrust (STT); normal faults and extensional structures: Gurla-Mandhata detachment (GM), Sangri-Nacuo fault (SNF), Yadong-Gulu fault (YGF); Anyimaqen-Kunlun-Muztagh suture zone (AMS), Bangonghu-Nujiang suture zone (BNS), Jinshaiang suture zone (JS), Rushan-Pshart suture zone (RE), Shyok suture zone (SSZ), Yalu-Zangbo suture zone (YZYS). In Figure 7, the crustal discontinuities are mostly concentrated in several separate parts of the boundary zone between the Indian and Eurasian plates. On the Pamir Plateau, the areas with maximum THDs in the E-W direction are mainly distributed in front of the WHS, from the SSZ to the KKS.