鄂霍次克海下间断面的起伏及俯冲带的穿透
摘要
利用德国GRSN宽频带台网、GRF宽频带台阵和美国SCSN短周期台网记录到的发生于鄂霍次克海的地震资料,采用N次根倾斜叠加方法,研究了鄂霍次克海下间断面的存在情况、410和660 km间断面的形态和性质,并且探讨了俯冲板块在660 km间断面附近的穿透情况.结果表明,在鄂霍次克海地区410和660 km间断面比较清楚,同时在其他深度如150,220和520 km也可能存在间断面;发现在俯冲区域410和660 km间断面分别发生抬升和下凹,为相变界面提供了证据;在鄂霍次克海俯冲带的北部,俯冲板块可能穿透660 km间断面进入下地幔;而在南部,则更可能是在660 km间断面上停滞
引文
1 Paulssen H. Evidence for a sharp 670-km discontinuity as inferred from P-to-S converted waves. J Geophys Res, 1988, 93: 10． 4X9 ~ 10,500
2 Kawakatsu H, Niu F. Seismic evidence for a 920-km discontinuity in the mantle. Nature, 1994, 371: 301-305
3 Christensen U R, Yuen D. The interaction of a subducting lithospheric slab with a chemical or phase boundary. J Geophys Res, 1984, 89: 4389-4402
4 Castle J C. Crcager K C. Seismic evidence against a mantle chemical discontinuity near 660 km depth beneath lzu-Bonin. Geophys Res Lett, 1997, 24: 241-244
5 Collier J D, Helffrich G R. Topography of the "410" and "660" km seismic discontinuities in the lzu-Bonin subduction zone. Geophys Res Lett. 1997,24: 1535-1538
6 臧绍先,宁杰远.西太平洋俯冲带的研究及其动力学意义.地球物理学报,1996,39:188～202
7 Castle J C, Creager K C. Topography of the 660-km seismic discontinuity beneath l/u-Bonin: Implications for tectonic history and slab deformation. J Geophys Res, 1998, 103: 12511-12527
8 Castle J C, Creager K C. Local sharpness and shear wave speed jump across the 660-km discontinuity. J Geophys Res, 2000, 105: 6191-6200
9 Benz H M, Vidale J E. Sharpness of upper-mantle discontinuities determined from high-frequency reflections. Nature, 1993, 365: 147-150
10 Neele F. Sharp 400-km discontinuity from short-period P reflections. Geophys Res Lett, 1996, 23: 419-422
11 Melbourne T, Helmberger D. Fine structure of the 410-km discontinuity. J Geophys Res, 1998, 103: 10,091-10,102
12 Shearer P M, Flanagan M P. Seismic velocity and density jumps across the 410-and 660-kilometer discontinuities. Science, 1999, 285: 1545-1548
13 LeFevre L V, Helmbrger D V. Upper mantle P velocity structure of the Canadian shield. J Geophys Res, 1989, 94: 17749-17765
14 Revenaugh J, Jordan T H. A study of mantle layering beneath the western Pacific. J Geophys Res, 1989, 94: 5787-5813
15 Shearer P M. Seismic imaging of upper-mantle structure with new evidence for a 520-km discontinuity. Nature, 1990． 344: 121-126
16 Shearer P M. Constraints on upper mantle discontinuities from observations of long-period reflected and converted phases. J Geophys Res, 1991,96: 18,147-18,182
17 Vidale J E, Benz H M. Upper-mantle seismic discontinuities and the thermal structure of subduction zones. Nature, 1992, 356: 678-683
18 Ryberg T, Wenzel F, Egorkin A V, et al. Short-period observation of the 520 km discontinuity in northern Eurasia. J Geophs Res, 1997, 102(B3) : 5413-5422
19 Revenaugh J, Jordan T H. Mantle layering from ScS reverberations, 3． The upper mantle. J Geophys Res, 1991, 96: 19781-19810
20 Bowman J R, Kennett B L N. An investigation of the upper mantle beneath NW Australia using a hybrid seismograph array. Geophys J Int, 1990, 101: 411-424
21 周元泽,臧绍先.牡丹江和海拉尔台下方地幔间断面结构及推论,地球物理学报.2001,44(6) :761～773
22 Bock G, Ha J. Short-period S-P conversion in the mantle at a depth near 700 km. Geophys J R Astron Soc, 1984, 77: 593-615
23 Richards M A, Wicks C W. S-P conversion from the transition zone beneath Tonga and the nature of the 670 km discontinuity. Geophys J Int. 1990． 101: 1-35
24 Barley B J. Hudson J A. Douglas A. S to P scattering at the 650km discontinuity. Geophys J R Aslron Soc. 1982, 69: 159-172
25 Shearer P M, Masters T G. Global mapping of topography on the 660km discontinuity. Nature, 1992, 355: 791-796
26 Zhou H. How well can we resolve the deep seismic slab with seismic tomography? Geophys Res Lett, 1988, 15: 1425-1428
27 Zhou H, Clayton R W. P and S travel time inversions for subducting slab under the island arcs of the Northwest Pacific. J Geophys Res, 1990, 95: 6829-6851
28 Fukao Y, Obayashi M, Inoue H, et al. Subducting slabs stagnant in the mantle transition zone. J Geophys Res, 1992, 97(B4) : 4809-4822
29 van der Hilst, Engdahl R, Spakman W, et al. Tomographic imaging of subducted lithosphere below northwest Pacific island arcs. Nature, 1991,353: 37-43
30 van der Hilst, Engdahl E R, Spakman W. Tomographic inversion of P and pP data for aspherical mantle structure below the northwest Pacific r
2 Kawakatsu H, Niu F. Seismic evidence for a 920-km discontinuity in the mantle. Nature, 1994, 371: 301-305
3 Christensen U R, Yuen D. The interaction of a subducting lithospheric slab with a chemical or phase boundary. J Geophys Res, 1984, 89: 4389-4402
4 Castle J C. Crcager K C. Seismic evidence against a mantle chemical discontinuity near 660 km depth beneath lzu-Bonin. Geophys Res Lett, 1997, 24: 241-244
5 Collier J D, Helffrich G R. Topography of the "410" and "660" km seismic discontinuities in the lzu-Bonin subduction zone. Geophys Res Lett. 1997,24: 1535-1538
6 臧绍先,宁杰远.西太平洋俯冲带的研究及其动力学意义.地球物理学报,1996,39:188～202
7 Castle J C, Creager K C. Topography of the 660-km seismic discontinuity beneath l/u-Bonin: Implications for tectonic history and slab deformation. J Geophys Res, 1998, 103: 12511-12527
8 Castle J C, Creager K C. Local sharpness and shear wave speed jump across the 660-km discontinuity. J Geophys Res, 2000, 105: 6191-6200
9 Benz H M, Vidale J E. Sharpness of upper-mantle discontinuities determined from high-frequency reflections. Nature, 1993, 365: 147-150
10 Neele F. Sharp 400-km discontinuity from short-period P reflections. Geophys Res Lett, 1996, 23: 419-422
11 Melbourne T, Helmberger D. Fine structure of the 410-km discontinuity. J Geophys Res, 1998, 103: 10,091-10,102
12 Shearer P M, Flanagan M P. Seismic velocity and density jumps across the 410-and 660-kilometer discontinuities. Science, 1999, 285: 1545-1548
13 LeFevre L V, Helmbrger D V. Upper mantle P velocity structure of the Canadian shield. J Geophys Res, 1989, 94: 17749-17765
14 Revenaugh J, Jordan T H. A study of mantle layering beneath the western Pacific. J Geophys Res, 1989, 94: 5787-5813
15 Shearer P M. Seismic imaging of upper-mantle structure with new evidence for a 520-km discontinuity. Nature, 1990． 344: 121-126
16 Shearer P M. Constraints on upper mantle discontinuities from observations of long-period reflected and converted phases. J Geophys Res, 1991,96: 18,147-18,182
17 Vidale J E, Benz H M. Upper-mantle seismic discontinuities and the thermal structure of subduction zones. Nature, 1992, 356: 678-683
18 Ryberg T, Wenzel F, Egorkin A V, et al. Short-period observation of the 520 km discontinuity in northern Eurasia. J Geophs Res, 1997, 102(B3) : 5413-5422
19 Revenaugh J, Jordan T H. Mantle layering from ScS reverberations, 3． The upper mantle. J Geophys Res, 1991, 96: 19781-19810
20 Bowman J R, Kennett B L N. An investigation of the upper mantle beneath NW Australia using a hybrid seismograph array. Geophys J Int, 1990, 101: 411-424
21 周元泽,臧绍先.牡丹江和海拉尔台下方地幔间断面结构及推论,地球物理学报.2001,44(6) :761～773
22 Bock G, Ha J. Short-period S-P conversion in the mantle at a depth near 700 km. Geophys J R Astron Soc, 1984, 77: 593-615
23 Richards M A, Wicks C W. S-P conversion from the transition zone beneath Tonga and the nature of the 670 km discontinuity. Geophys J Int. 1990． 101: 1-35
24 Barley B J. Hudson J A. Douglas A. S to P scattering at the 650km discontinuity. Geophys J R Aslron Soc. 1982, 69: 159-172
25 Shearer P M, Masters T G. Global mapping of topography on the 660km discontinuity. Nature, 1992, 355: 791-796
26 Zhou H. How well can we resolve the deep seismic slab with seismic tomography? Geophys Res Lett, 1988, 15: 1425-1428
27 Zhou H, Clayton R W. P and S travel time inversions for subducting slab under the island arcs of the Northwest Pacific. J Geophys Res, 1990, 95: 6829-6851
28 Fukao Y, Obayashi M, Inoue H, et al. Subducting slabs stagnant in the mantle transition zone. J Geophys Res, 1992, 97(B4) : 4809-4822
29 van der Hilst, Engdahl R, Spakman W, et al. Tomographic imaging of subducted lithosphere below northwest Pacific island arcs. Nature, 1991,353: 37-43
30 van der Hilst, Engdahl E R, Spakman W. Tomographic inversion of P and pP data for aspherical mantle structure below the northwest Pacific r
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