| 利用长期GPS数据研究2008年汶川地震震后形变 |
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| 引用本文： | 贺克锋,赵斌,杜瑞林.利用长期GPS数据研究2008年汶川地震震后形变[J].大地测量与地球动力学,2019,39(2):122-126. |
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| 作者姓名： | 贺克锋 赵斌 杜瑞林 |
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| 作者单位： | 中国地震局地震研究所地震大地测量重点实验室,武汉市洪山侧路40号,430071;中国地震局地震研究所地震大地测量重点实验室,武汉市洪山侧路40号,430071;中国地震局地壳应力研究所武汉科技创新基地,武汉市洪山侧路40号,430071;中国地震局第二监测中心,西安市西影路316号,710054 |
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| 摘 要： | 采用2008年汶川MW7.9地震震后7 a的GPS连续站和流动站的长期观测资料，基于粘弹性松弛模型，利用PSGRN/PSCMP程序计算汶川震后形变，反演巴颜喀拉块体下的粘弹性参数。其中分层模型考虑巴颜喀拉块体下存在低速带，最优拟合的粘弹性松弛模型显示该低速带粘弹性参数为2.51×1018 Pa·s，而中下地壳粘弹性参数为3.98×1018 Pa·s。
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| 关 键 词： | 汶川地震 震后形变 粘弹性松弛 低速层 GPS |
Post-Seismic Deformation Associated with the 2008 Wenchuan Earthquake by Long-Term GPS Data |
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| HE Kefeng,ZHAO Bin,DU Ruilin.Post-Seismic Deformation Associated with the 2008 Wenchuan Earthquake by Long-Term GPS Data[J].Journal of Geodesy and Geodynamics,2019,39(2):122-126. |
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| Authors: | HE Kefeng ZHAO Bin DU Ruilin |
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| Abstract: | In this paper, we process relatively dense GPS data from continuous and campaign stations spanning over 7 years ofter the 2008 Wenchuan earthquake in the Songpan-Ganzi terrane and explore a series of viscoelastic relaxation models using the PSGRN/PSCMP program. We examined the existence of the proposed lower crust flow under the eastern Tibetan plateau. Our results show that the best-fitting steady-state viscosity of the thin low velocity zone is approximately 2.51×1018 Pa·s, while the Maxwell viscosity of the middle-lower crust beneath the Plateau is around 3.98×1018 Pa·s. |
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| Keywords: | Wenchuan earthquake postseismic deformation viscoelastic relaxation low-velocity layer GPS |
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