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Additional file 1: Figure S1. Synthetic receiver function with 1 km thick sedimentary layer and different �� value of sediment. The depth of Moho is 40 km and the average crustal Vp/Vs ratio (under sediment layer) is 1.78. (a) �� = 2.0. (b) �� = 2.5. (c) �� = 3.0. (d) �� = 3.5. Figure S2. H-�� Analysis of Synthetic receiver function in Figure S1. (a), (c), (e) and (g) is H-�� stacking of RF in Figure S1(a-d) without sediments. (b), (d), (f) and (h) is H-�� stacking of RF in Figure S1(a���d) with sediments. Figure S3. Synthetic receiver function with 2 km thick sedimentary layer and different �� value of sediment. The depth of Moho is 40 km and the average crustal Vp/Vs ratio (under sediment layer) is 1.78. (a) �� = 2.0. (b) �� = 2.5. (c) �� = 3.0. (d) �� = 3.5. Figure S4. H-�� Analysis of Synthetic receiver function in Figure S3. (a), (c), (e) and (g) is H-�� stacking of RF in Figure S3(a-d) without sediments. (b), (d), (f) and (h) is H-�� stacking of RF in Figure S3(a-d) with sediments. Figure S5. Synthetic receiver function with 5 km thick sedimentary layer and different �� value of sediment. The depth of Moho is 40 km and the average crustal Vp/Vs ratio (under sediment layer) is 1.78. (a) �� = 2.0. (b) �� = 2.5. (c) �� = 3.0. (d) �� = 3.5. Figure S6. H-�� Analysis of Synthetic receiver function in Figure S3. (a) H-�� stacking of RF in Figure S5(a) without sediments. (b) H-�� stacking of RF in Figure S5(a) with sediments. Figure S7. (a) Distribution of sedimentary thickness and stations. (b-c) Receiver functions of stations 41210, 15782. Figure S8. - Analysis of stations 61133 and 61109. Table S1. Crustal thickness and Vp/Vs ratio beneath the stations in the study area. H: the estimated crustal thickness; ��: the Vp/Vs.