利用不规则网格地震层析成像研究2008年日本岩手地震及岛弧火山活动(英文)
|
摘要
为了深入了解日本东北俯冲带的地震构造及火山活动,利用布设在日本列岛上密集地震台网所记录到的高质量浅震及深震到时数据,反演求得了该区域地壳及上地幔的三维P波和S波速度结构。为了最大程度地利用地震数据提取模型空间中更为精细的速度结构信息,采用不规则网格模型采进行地震层析成像反演。所得的高分辨率成像结果清晰地显示,2008年岩手地震(M 7.2)位于高低速异常的转换区,而且震源区的地壳介质非均匀性极强。在震源区的下地壳及上地幔顶部存在着明显的低速异常,可能代表了岛弧岩浆和流体在该深度处的储集。研究结果表明,2008年岩手地震的产生受到了来自上地幔楔的岩浆和流体的影响,且这些岩浆和流体与俯冲太平洋板块的脱水作用有着密切的联系。
To better understand the seismotectonics and arc magmatism in the Northeast Japan subduction zone,we studied high-resolution 3-D P-and S-wave velocity structures of the crust and upper mantle under this region using a large number of high-quality arrival-time data from the local shallow and intermediate-depth earthquakes recorded by the high-sensitivity seismic network installed on the Japan Islands.We adopt an irregular-grid parameterization to conduct the tomographic inversion in order to extract more useful information from the data used.Our results show that the mainshock of the 2008 Iwate-Miyagi earthquake (M 7.2) was located in a boundary zone where seismic velocity changed dramatically,indicating that the crustal medium in the source area is very heterogeneous.A pronounced low-velocity anomaly is revealed in the lower crust and uppermost mantle under the mainshock hypocenter,which may reflect the arc magma and fluids ascending from the upper-mantle wedge released by the dehydration process of the subducting Pacific slab.The fluids and arc magma may have influenced the nucleation and rupture process of the large crustal earthquakes.
To better understand the seismotectonics and arc magmatism in the Northeast Japan subduction zone,we studied high-resolution 3-D P-and S-wave velocity structures of the crust and upper mantle under this region using a large number of high-quality arrival-time data from the local shallow and intermediate-depth earthquakes recorded by the high-sensitivity seismic network installed on the Japan Islands.We adopt an irregular-grid parameterization to conduct the tomographic inversion in order to extract more useful information from the data used.Our results show that the mainshock of the 2008 Iwate-Miyagi earthquake (M 7.2) was located in a boundary zone where seismic velocity changed dramatically,indicating that the crustal medium in the source area is very heterogeneous.A pronounced low-velocity anomaly is revealed in the lower crust and uppermost mantle under the mainshock hypocenter,which may reflect the arc magma and fluids ascending from the upper-mantle wedge released by the dehydration process of the subducting Pacific slab.The fluids and arc magma may have influenced the nucleation and rupture process of the large crustal earthquakes.
引文
Abers G, Roecker S. 1991. Deep structure of an arc-continent collision: Earthquake relocation and inversion for upper mantle P and S wave velocities beneath Papua New Guinea. Journal of Geophysical Research, 96:6379-6401.
Ajo-Franklin J. Urban J, Harris J. 2006. Using resolution-constrained adaptive meshes for travellime tomography. Journal of Seismic Exploration, 14: 371-392.
Aki K, Christoffersson A, Husebye E. 1977. Determination of the three-dimensional seismic structure of the lithosphere. Journal of Geophysical Research, 82: 277-296.
Bohm G, Vesnaver A. 1999. In quest of the grid. Geophysics, 64:1116-1125.
Chen C, Wang W. Teng T. 2001. 3D velocity structure around the source area of the 1999 Chi-Chi, Taiwan, earthquake: Before and after the mainshock. Bulletin of the Seismological Society of America, 91: 1013-1027.
Cheng B, Zhao D, Zhang G. 2011. Seismic tomography and anisotropy in the source area of the 2008 Iwate-Miyagi earthquake (M 7.2). Physics of the Earth and Planetary Interiors, 184: 172-185.
Cox B. 2004. Tomographic Inversion of Focusing Operators. Ph.D. Thesis, Delft University of Technology.
Dziewonski A, Hager B, O'Connell R. 1977. Large-scale heterogeneities in the lower mantle. Journal of Geophysical Research, 82: 239-255.
Eberhart-Phillips D. 1993. Local earthquake tomography: Earthquake source regions. Iyer H M, Hirahara K. Seismic Tomography: Theory and Practice. London: Chapman and Hall, 614-643.
Gudmundsson (), Sambridge M. 1998. A regionalized upper mantle (RUM) seismic model. Journal of Geophysical Research, 103: 7121-7136.
Hasegawa A, Yamamoto A. 1994. Deep, low-frequency microearthquakes in or around seismic low-velocity zones beneath active volcanoes in northeastern Japan. Tectonophysics, 233: 233-252.
Hasegawa A, Nakajima J, Uchida N, et al. 2009. Plate subduction, and generation of earthquakes and magmas in Japan as inferred from seismic observations: An overview. Gondwana Research, 16: 370-400.
Hickman S, SibsonR, BruhnR. 1995. Introduction to special section: mechanical involvement of fluids in faulting. Journal of Geophysical Research, 100: 12831-12840.
Horiguchi K, Matsuda J. 2008. On the change of 3He/4He ratios in hot spring gases after the Iwate-Miyagi Nairiku Earthquake in 2008. Geochemical Journal, 42: el-e4.
Huang J, Zhao D. 2004. Crustal heterogeneity and seismotectonics of the region around Beijing, China. Tectonophysics, 385: 159-180.
Huang J, ZhaoD. 2009. Seismic imaging of the crust and upper mantle under Beijing and surrounding regions. Physics of the Earth and Planetary Interiors, 173: 330-348.
Huang Z, ZhaoD. 2013. Relocating the 2011 Tohoku-oki earthquakes (M 6.0—9.0). Tectonophysics, 586: 35-45.
Huang Z, Zhao D, Wang L. 2011. Stress field in the 2008 Iwate-Miyagi earthquake (M 7. 2) area. Geochemistry, Geophysics, Geosystems, 12: Q06006.
Johnson P, McEvilly T. 1995. Parkfield seismicity: Fluid-driven?Journal of Geophysical Research, 100: 12937-12950.
Karason H. 2002. Constraints on Mantle Convection from Seismic Tomography and Flow Modeling. Ph. D. Thesis, Massachusetts Institute of Technology.
Lees J, Nicholson C. 1993. Three-dimensional tomography of the 1992 southern California earthquake sequence: Constraints on dynamic earthquake rupture? Geology, 21: 387-390.
Lei J, Zhao D. 2009. Structural heterogeneity of the Longmenshan fault zone and the mechanism of the 2008 Wenchuan earthquake (Ms 8.0). Geochemistry, Geophysics, Geosystems, 10: Q10010.
Liu X, Zhao D, Li S. 2013. Seismic imaging of the Southwest Japan arc from the Nankai trough to the Japan Sea. Physics of the Earth and Planetary Interiors, 216: 59-73.
Mishina M. 2009. Distribution of crustal fluids in Northeast Japan as inferred from resistivity surveys. Gondwana Research, 16: 563-571.
Mishra O P, ZhaoD. 2003. Crack density, saturation rate and porosity at the 2001 Bhuj, India, earthquake hypocenter: A fluid driven earthquake? Earth and Planetary Science Letters, 212: 393-405.
Okada T, Hasegawa A. 2000. Activity of deep low-frequency microearthquakes and their moment tensors in northeastern Japan. Bulletin of Volcanological Society of Japan, 45: 47-63.
Padhy S, Mishra O P, Zhao D, et al. 2011. Crustal heterogeneity in the 2007 Noto-Hanto earthquake area and its geodynamical implications. Tectonophysics, 509: 55-68.
Paige C, Saunders M. 1982. LSQR: An algorithm for sparse linear equations and sparse least squares. ACM Transactions of Mathematical Software, 8: 43-71.
Seno T, Sakurai T, Stein S. 1996. Can the Okhotsk plate be discriminated from the North American plate? Journal of Geophysical Research, 101:11305-11315.
Sibson R. 1992. Implications of fault-valve behavior for rupture nucleation and recurrence. Tectonophysics, 211: 283-293.
Spakman W, Bijwaard H. 2001. Optimization of cell parameterizations for tomographic inverse problems. Pure and Applied Geophysics, 158: 1401-1423.
Thurber C. 1983. Earthquake locations and three-dimensional crustal structure in the Coyote Lake area, central California. Journal of Geophysical Research, 88: 8226-8236.
Thurber C, RitsemaJ. Seismic tomography and inverse methods. Gerald S. Treatise on Geophysics, Volume 1: Theory and Observations. (2007-10-07) [2010-02-05]. http://store.elsevier.com/product. jsp?locale=en ASIA&.isbn=9780444519283.
Tong P, Zhao D, Yang D. 2011. Tomography of the 1995 Kobe earthquake area: Comparison of finite-frequency and ray approaches. Geophysical Journal International, 187: 278-302.
Tong P, Zhao D, Yang D. 2012. Tomography of the 2011 Iwaki earthquake (M 7. 0) and Fukushima nuclear power plant area. Solid Earth, 3: 43-51.
Ueno H, Hatakeyama T, Aketagawa T, et al. 2002. Improvement of hypocenter determination procedures in the Japan Meteorological Agency (in Japanese). Quarterly Journal of Seismology, 65: 123-134.
Vesnaver A. 1996. Irregular grids in seismic tomography and minimum-time ray tracing. Geophysical Journal International, 126: 147-165.
Wang Z, Zhao D. 2006a. Seismic evidence for the influence of fluids on the 2005 west off Fukuoka prefecture earthquake in southwest Japan. Physics of the Earth and Planetary Interiors, 155: 313-324.
Wang Z, Zhao D. 2006b. Seismic images of the source area of the 2004 Mid-Niigata prefecture earthquake in Northeast Japan. Earth and Planetary Science Letters, 244:16-31.
Xia S, Zhao D, Qiu X. 2008. The 2007 Niigata earthquake: Effect of arc magma and fluids. Physics of the Earth and Planetary Interiors, 166: 153-166.
Zhang H, Thurber C. 2005. Adaptive mesh seismic tomography based on tetrahedral and Voronoi diagrams: Application to Parkfield, California. Journal of Geophysical Research, 110, doi: 10. 1029/2004JB003186.
Zhao D. 2004. Global tomographic images of mantle plumes and subductings slabs: Insight into deep Earth dynamics. Physics of the Earth and Planetary Interiors, 146: 3-34.
Zhao D, Hasegawa A, Hortuchi S. 1992. Tomographic imaging of P and S wave velocity structure beneath northeastern Japan. Journal of Geophysical Research, 97: 19909-19928.
Zhao D, Kanamori H, Negishi H, et al. 1996. Tomography of the source area of the 1995 Kobe earthquake: Evidence for fluids at the hypocenter? Science, 274: 1891-1894.
Zhao D, Yu S, Ohtani E. 2011a. East Asia: Seismotectonics, magmatism and mantle dynamics. Journal of Asian Earth Sciences, 40; 689-709.
Zhao D, Huang Z, Umino N, et al. 2011b. Seismic imaging of the A-mur-Okhotsk plate boundary zone in the Japan Sea. Physics of the Earth and Planetary Interiors, 188: 82-95.
Zhao D, Yamamoto Y, Yanada T. 2013. Global mantle heterogeneity and its influence on teleseismic regional tomography. Gondwana Research, 23: 595-616.
Ajo-Franklin J. Urban J, Harris J. 2006. Using resolution-constrained adaptive meshes for travellime tomography. Journal of Seismic Exploration, 14: 371-392.
Aki K, Christoffersson A, Husebye E. 1977. Determination of the three-dimensional seismic structure of the lithosphere. Journal of Geophysical Research, 82: 277-296.
Bohm G, Vesnaver A. 1999. In quest of the grid. Geophysics, 64:1116-1125.
Chen C, Wang W. Teng T. 2001. 3D velocity structure around the source area of the 1999 Chi-Chi, Taiwan, earthquake: Before and after the mainshock. Bulletin of the Seismological Society of America, 91: 1013-1027.
Cheng B, Zhao D, Zhang G. 2011. Seismic tomography and anisotropy in the source area of the 2008 Iwate-Miyagi earthquake (M 7.2). Physics of the Earth and Planetary Interiors, 184: 172-185.
Cox B. 2004. Tomographic Inversion of Focusing Operators. Ph.D. Thesis, Delft University of Technology.
Dziewonski A, Hager B, O'Connell R. 1977. Large-scale heterogeneities in the lower mantle. Journal of Geophysical Research, 82: 239-255.
Eberhart-Phillips D. 1993. Local earthquake tomography: Earthquake source regions. Iyer H M, Hirahara K. Seismic Tomography: Theory and Practice. London: Chapman and Hall, 614-643.
Gudmundsson (), Sambridge M. 1998. A regionalized upper mantle (RUM) seismic model. Journal of Geophysical Research, 103: 7121-7136.
Hasegawa A, Yamamoto A. 1994. Deep, low-frequency microearthquakes in or around seismic low-velocity zones beneath active volcanoes in northeastern Japan. Tectonophysics, 233: 233-252.
Hasegawa A, Nakajima J, Uchida N, et al. 2009. Plate subduction, and generation of earthquakes and magmas in Japan as inferred from seismic observations: An overview. Gondwana Research, 16: 370-400.
Hickman S, SibsonR, BruhnR. 1995. Introduction to special section: mechanical involvement of fluids in faulting. Journal of Geophysical Research, 100: 12831-12840.
Horiguchi K, Matsuda J. 2008. On the change of 3He/4He ratios in hot spring gases after the Iwate-Miyagi Nairiku Earthquake in 2008. Geochemical Journal, 42: el-e4.
Huang J, Zhao D. 2004. Crustal heterogeneity and seismotectonics of the region around Beijing, China. Tectonophysics, 385: 159-180.
Huang J, ZhaoD. 2009. Seismic imaging of the crust and upper mantle under Beijing and surrounding regions. Physics of the Earth and Planetary Interiors, 173: 330-348.
Huang Z, ZhaoD. 2013. Relocating the 2011 Tohoku-oki earthquakes (M 6.0—9.0). Tectonophysics, 586: 35-45.
Huang Z, Zhao D, Wang L. 2011. Stress field in the 2008 Iwate-Miyagi earthquake (M 7. 2) area. Geochemistry, Geophysics, Geosystems, 12: Q06006.
Johnson P, McEvilly T. 1995. Parkfield seismicity: Fluid-driven?Journal of Geophysical Research, 100: 12937-12950.
Karason H. 2002. Constraints on Mantle Convection from Seismic Tomography and Flow Modeling. Ph. D. Thesis, Massachusetts Institute of Technology.
Lees J, Nicholson C. 1993. Three-dimensional tomography of the 1992 southern California earthquake sequence: Constraints on dynamic earthquake rupture? Geology, 21: 387-390.
Lei J, Zhao D. 2009. Structural heterogeneity of the Longmenshan fault zone and the mechanism of the 2008 Wenchuan earthquake (Ms 8.0). Geochemistry, Geophysics, Geosystems, 10: Q10010.
Liu X, Zhao D, Li S. 2013. Seismic imaging of the Southwest Japan arc from the Nankai trough to the Japan Sea. Physics of the Earth and Planetary Interiors, 216: 59-73.
Mishina M. 2009. Distribution of crustal fluids in Northeast Japan as inferred from resistivity surveys. Gondwana Research, 16: 563-571.
Mishra O P, ZhaoD. 2003. Crack density, saturation rate and porosity at the 2001 Bhuj, India, earthquake hypocenter: A fluid driven earthquake? Earth and Planetary Science Letters, 212: 393-405.
Okada T, Hasegawa A. 2000. Activity of deep low-frequency microearthquakes and their moment tensors in northeastern Japan. Bulletin of Volcanological Society of Japan, 45: 47-63.
Padhy S, Mishra O P, Zhao D, et al. 2011. Crustal heterogeneity in the 2007 Noto-Hanto earthquake area and its geodynamical implications. Tectonophysics, 509: 55-68.
Paige C, Saunders M. 1982. LSQR: An algorithm for sparse linear equations and sparse least squares. ACM Transactions of Mathematical Software, 8: 43-71.
Seno T, Sakurai T, Stein S. 1996. Can the Okhotsk plate be discriminated from the North American plate? Journal of Geophysical Research, 101:11305-11315.
Sibson R. 1992. Implications of fault-valve behavior for rupture nucleation and recurrence. Tectonophysics, 211: 283-293.
Spakman W, Bijwaard H. 2001. Optimization of cell parameterizations for tomographic inverse problems. Pure and Applied Geophysics, 158: 1401-1423.
Thurber C. 1983. Earthquake locations and three-dimensional crustal structure in the Coyote Lake area, central California. Journal of Geophysical Research, 88: 8226-8236.
Thurber C, RitsemaJ. Seismic tomography and inverse methods. Gerald S. Treatise on Geophysics, Volume 1: Theory and Observations. (2007-10-07) [2010-02-05]. http://store.elsevier.com/product. jsp?locale=en ASIA&.isbn=9780444519283.
Tong P, Zhao D, Yang D. 2011. Tomography of the 1995 Kobe earthquake area: Comparison of finite-frequency and ray approaches. Geophysical Journal International, 187: 278-302.
Tong P, Zhao D, Yang D. 2012. Tomography of the 2011 Iwaki earthquake (M 7. 0) and Fukushima nuclear power plant area. Solid Earth, 3: 43-51.
Ueno H, Hatakeyama T, Aketagawa T, et al. 2002. Improvement of hypocenter determination procedures in the Japan Meteorological Agency (in Japanese). Quarterly Journal of Seismology, 65: 123-134.
Vesnaver A. 1996. Irregular grids in seismic tomography and minimum-time ray tracing. Geophysical Journal International, 126: 147-165.
Wang Z, Zhao D. 2006a. Seismic evidence for the influence of fluids on the 2005 west off Fukuoka prefecture earthquake in southwest Japan. Physics of the Earth and Planetary Interiors, 155: 313-324.
Wang Z, Zhao D. 2006b. Seismic images of the source area of the 2004 Mid-Niigata prefecture earthquake in Northeast Japan. Earth and Planetary Science Letters, 244:16-31.
Xia S, Zhao D, Qiu X. 2008. The 2007 Niigata earthquake: Effect of arc magma and fluids. Physics of the Earth and Planetary Interiors, 166: 153-166.
Zhang H, Thurber C. 2005. Adaptive mesh seismic tomography based on tetrahedral and Voronoi diagrams: Application to Parkfield, California. Journal of Geophysical Research, 110, doi: 10. 1029/2004JB003186.
Zhao D. 2004. Global tomographic images of mantle plumes and subductings slabs: Insight into deep Earth dynamics. Physics of the Earth and Planetary Interiors, 146: 3-34.
Zhao D, Hasegawa A, Hortuchi S. 1992. Tomographic imaging of P and S wave velocity structure beneath northeastern Japan. Journal of Geophysical Research, 97: 19909-19928.
Zhao D, Kanamori H, Negishi H, et al. 1996. Tomography of the source area of the 1995 Kobe earthquake: Evidence for fluids at the hypocenter? Science, 274: 1891-1894.
Zhao D, Yu S, Ohtani E. 2011a. East Asia: Seismotectonics, magmatism and mantle dynamics. Journal of Asian Earth Sciences, 40; 689-709.
Zhao D, Huang Z, Umino N, et al. 2011b. Seismic imaging of the A-mur-Okhotsk plate boundary zone in the Japan Sea. Physics of the Earth and Planetary Interiors, 188: 82-95.
Zhao D, Yamamoto Y, Yanada T. 2013. Global mantle heterogeneity and its influence on teleseismic regional tomography. Gondwana Research, 23: 595-616.
版权所有：© 2023 中国地质图书馆 中国地质调查局地学文献中心