The Relics, Ages and Significance of Prehistoric Large Earthquakes in the Angang Graben in South Tibet
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摘要: 地表调查发现, 沿近南北向亚东-谷露裂谷中段的安岗地堑存在地震大滑坡、多世代断层崖和断层崩积楔等多种类型的史前大地震遗迹.进一步的观测和年代分析表明: 该区的古地震滑坡体至少存在新、老两期, 其中规模最大的"尼续大滑坡体"应该是最新一次大地震所形成.该区T1到T6各阶地的形成时代从新到老分别为7.7~2.1 ka、11.0~10.5 ka、17.6~12.1 ka、25.7~22.9 ka、58.4~70.6 ka和130~150 ka, 它们沿主边界正断层的平均垂直断距依次为2.8 m、6.1~7.9 m、10.3~12.5 m、16.6~19.0 m、28.0 m和76.0 m.其中T1和T2阶地上的断崖剖面揭示, 最近两次大地震发生在距今约5.8±1.0 ka和2.4±0.2 ka.综合分析认为: 安岗地堑的大地震活动具有较明显的丛集性特征, 并且在距今约23~26 ka以来一直处于大地震活跃期, 期间的断层垂直活动速率为0.8~1.3 mm/a, 大地震的原地复发间隔大致为3.3~3.6 ka, 特征地震的矩震级为7.0~7.2, 推算整个尼木地堑群的大震复发间隔最短可能只有约1.0~1.2 ka.研究结果指示, 藏南裂谷的大地震活动性明显比藏北的近南北向正断层更显著.Abstract: The Angang basin is a typical half-graben of the Nyemo graben group of the central Yadong-Gulu rift in south Tibet. Multiple-generation fault scarps, earthquake-induced large landslides, and colluvial wedges of fault scarps along the west margin boundary normal fault of the graben contain rich information of prehistoric earthquake events and are effective marks to identify prehistoric large earthquakes (M≥7.0). Based on the measured vertical displacements of multiple-generation fault scarps and OSL and 14C dating results of 36 samples from river terraces and fault scarp profiles, it can be estimated that the vertical displacement rate of western main boundary fault zone of Angang graben is 0.8-1.3 mm/a and at least 6 large earthquakes have occurred in the Angang graben since about 23-26 ka. According to the length and the maximum vertical displacement of earthquake fault, the magnitude of such large earthquakes should be in a range of Mw7.0-7.2. The newly study result on paleoearthquake show that the ages of the last two large earthquakes should be about 5.8±1.0 ka and 2.4±0.2 ka before presents respectively, and the average recurrence interval between two large earthquakes would roughly be 3.3-3.6 ka in Angang, but the recurrence interval of large earthquakes in the whole Nyemo graben group should be short and inferred to be 1.0-1.2 ka. Prominent normal faulting and frequent large earthquakes indicate that the large earthquake activity is consistent with clusterd-slip model and are in the seismic active period since about 23-26 ka in the Angang graben and Nyemo graben group.
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Key words:
- Tibet Plateau /
- Yadong-Gulu rift /
- active normal fault /
- earthquake /
- earthquake-induced landslip
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图 1 研究区地质
a.亚东-谷露裂谷DEM图；b.尼木地堑群中安岗-羊易地堑对的遥感影像；c.尼木-羊易地堑地质剖面
Fig. 1. Geology of study area
图 2 尼木地堑群中安岗地堑的DEM影像及地震构造
AG.安岗地堑；YG.羊易地堑；1992年Mw6.1地震的极震区范围(谢乐金，1994)；1960年以来M≥4.0级浅源仪器记录地震数据来自IRIS(国际地震联合会)；震源机制解来自Global CMT Search Results
Fig. 2. The DEM image shows sites of investigations, earthquakes distribution and main active fault around Angang graben of Nyemo graben group
图 3 沿安岗盆地西缘主边界断层发育的一系列指示断裂第四纪和晚第四纪活动的地质-地貌标志
a.安岗盆地“西断东超”形成的半地堑地貌(镜向北)；b.安岗盆地西缘的线性断层三角面地貌(镜向西)；c.正断层错动阶地形成的断层崖地貌(镜向北西，图 2位置1)；d.正断层错动花岗岩形成的断层错动带(镜向北，图 2位置1)；e.正断层错动带中指示断层近垂直运动的擦痕(镜向西)；f.盆地西缘主边界正断层错动不同时代阶地形成多世代断层崖(镜向北西，图 2位置5)；图 3c，3f中的断层垂直断距编号与图 5对应
Fig. 3. The photos show a series of geological and geomorphic marks on active normal faulting along the main boundary normal fault of Angang basin
图 4 多世代断层崖形成过程
a.初始地貌面被错动之前；b.正断层错动初始地貌面，并被新一期地貌面所切割；c.断层再次活动错动两期不同时代地貌面后，又被新的地貌面所切割；d.断裂第三期活动后，形成错动三期不同时代地貌面、高度不同的多世代断层崖
Fig. 4. A sketch shows the forming process of multiple-generation fault scarp
图 5 安岗地堑西缘正断层上不同高度断层崖的地形剖面及年代学样品的采样剖面
标注“*”的为水准仪测量结果，其他为皮尺与坡角仪测量结果
Fig. 5. The measured topographic profile of fault scarps which ages are from new to old with the increase of scarp height and sampling profile of OSL dating along the western margin normal fault of the Angang graben
图 6 安岗地堑嗦格岗西(图 2，观察点3)，山前正断层垂直错动4级冲积阶地形成的多世代断层崖的遥感图像(a)和照片(b)
b.山前正断层错动河流阶地形成多世代断层崖和断坎地貌(镜向西)；图中的断层崖剖面编号与图 5对应
Fig. 6. The remote sensing imageand photo show the multiple-generation fault scarps which are resulted from offset four alluvial terraces along west boundary normal fault at west side of Suogegang of Angang graben
图 7 安岗地堑中“尼续古地震大滑坡体”的影像特征(a~c)及剖面(d)
Fig. 7. The remote image (a) and photos (b, c) show the geomorphologic features and crossing section (d) of "Large Nixu paleoearthquake-induced landslide" located in southwest of Angang graben
图 8 古地震前后的断层崖斜坡结构变化及断层崩积楔的形成过程
a.发生最新一次古地震前；b.古地震发生时或其后不久；c.古地震发生较长时间之后
Fig. 8. The sketch show the formation process of fault scarp slope and colluvial wedge caused by paleoearthquake resulted from normal faulting
图 9 安岗地堑嗦格岗西(图 2，观察点3)，T1和T2阶地断崖剖面及古地震探槽编录结果
a.T1断崖及探槽剖面位置；b.T1断崖地形剖面；c.跨T1断崖的探槽剖面；d.T2断崖与探槽剖面位置；e.跨T2断崖的探槽剖面
Fig. 9. The map show profiles and sites of exploratory trench crossing fault scarps offset terraces 1 and 2 respectively at west side of Suogegang of Angang graben
表 1 历史记载以来沿亚东-谷露裂谷发生的M≥6.0地震主要参数
Table 1. The main parameters on M≥6.0 earthquakes occurred along Yadong-Gulu rift since 1264
地震日期 震中位置 震级 可能的控震构造 北纬/东经 参考地点 1264 29.70°/90.60° 堆龙德庆县楚布寺 ≥6$^3{/_4}$ 尼木地堑群之羊易地堑 1411.09.29 29.70°/90.20° 当雄-羊八井 8.0 当雄-羊八井地堑系 1901.04.21 29.50°/90.10° 尼木北 6$^3{/_4}$ 尼木地堑群之庞刚地堑 1909.08.04 28.80°/90.50° 浪卡子 6$^3{/_4}$ 热龙地堑 1921.05之前 29.00°/89.70° 江孜 6$^1{/_4}$ 热龙地堑 1921.10.15 30.50°/91.50° 当雄东部一带 6$^1{/_4}$ 当雄地堑 1924.10.09 30.00°/90.00° 尼木县与当雄县交界 6$^1{/_2}$ 格达地堑 1925.01.12 30.50°/91.50° 当雄东部一带 6$^1{/_2}$ 当雄地堑 1935.05.21 28.80°/89.50° 江孜西南 6$^1{/_4}$ 涅如地堑或热龙地堑 1940.09.03 30.70°/91.70° 那曲县谷露东南 6$^1{/_4}$ 谷露地堑 1940.10.04 30.50°/91.50° 当雄东部一带 6.0 当雄地堑 1951.11.18 30.90°/91.50° 那曲县谷露西北 6.8 谷露地堑 1952.08.18 31.00°/91.50° 那曲县谷露 7.5 谷露地堑 1992.07.30 29.60°/90.25° 尼木县安岗 6.3 尼木地堑群之安岗地堑 2008.10.06 29.80°/90.30° 当雄县羊易乡 6.6 尼木地堑群之羊易地堑 注：表中1952年及之前的地震参数引自西藏地震史料汇编(第一卷)(西藏自治区科学技术委员会、档案馆，1982；1992年以来地震参数据中国地震台网. 
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表 2 安岗地堑晚第四纪阶地与古地震探槽OSL与14C年龄样品及测年结果
Table 2. The OSL and 14C dating results of deposits sampling from late quaternary terraces and paleoearthquake exploratory trench along main boundary fault of Angang graben
野外编号 观察点 采样位置 地貌部位 岩性 U(10-6) Th(10-6) K(%) 等效剂量ED(Gy) 年剂量(Gy/ka) 含水量(%) 年龄(ka) 北纬 东经 S234-1 3 29°33.718′ 90°14.156′ 断层上盘侧，T0上部 距顶约40 cm含砾中粗砂 4.03 19.40 2.77 13.75±0.28 6.15 7.39 2.2±0.1 S234-2 3 29°33.718′ 90°14.156′ 断层上盘T0的下伏T1基座 距顶约120 cm含砾中粗砂 2.09 6.42 2.90 34.56±1.69 4.48 2.00 7.7±0.5 S234-6 3 29°33.718′ 90°14.156′ 下盘侧，T1上部(探槽层①) 距顶约100 cm含砾中粗砂 2.11 12.00 2.79 19.04±0.72 4.82 5.66 3.9±0.2 S234-8 3 29°33.718′ 90°14.156′ 上盘侧，T1上部(探槽层①) 距顶约60 cm含砾中粗砂 6.03 41.10 2.73 18.99±1.56 8.92 6.45 2.1±0.1 S234-9 3 29°33.718′ 90°14.156′ 下盘侧T2上部土壤化层 距顶约80 cm含砾中粗砂 7.55 22.50 2.64 31.53±1.59 7.36 10.39 4.3±0.3 S234-10 3 29°33.718′ 90°14.156′ 下盘侧T2上部土壤化层 距顶约60 cm含砾中粗砂 6.80 33.70 2.39 22.33±1.28 7.94 10.11 2.8±0.2 S2274-4 3 29°33′45.2″ 90°14′11.3″ 断层下盘，T2顶部土壤化层 距顶约45 cm灰黄色细砂 5.10 15.10 2.90 17.80 3.86 0.03 4.5±0.5 S237-10 1 29°29.006′ 90°14.686′ 断层上盘侧，T3上部 距顶45 cm含砾中粗砂 2.94 12.80 2.22 82.19±2.13 4.68 3.81 17.6±0.6 S234-12 3 29°33.718′ 90°14.156′ 断层下盘侧，T3上部 距顶约20 cm含砾中细砂 5.72 25.60 2.34 110.21±7.98 6.90 7.48 16.0±1.3 S234-15 3 29°33.718′ 90°14.156′ 断层上盘侧，T3上部 距顶约60 cm砾石层顶中细砂 3.74 16.10 2.67 95.01±5.31 5.63 6.97 16.9±1.1 S2273-2 4 29°34′15.9″ 90°14′16.3″ 断层下盘侧，T3近顶部 距顶约50 cm灰色含碳细砂 3.40 14.50 2.10 36.50 2.97 0.03 12.1±1.6 S2273-4 4 29°34′15.9″ 90°14′16.3″ 断层上盘侧，T3近顶部 距顶部约35 cm灰黄色细砂 3.10 12.40 0.90 25.80 2.06 0.05 12.7±1.9 S2272-1 5 29°35′21.7″ 90°14′20.1″ 断层下盘侧T3上部 距顶约80 cm含粘土粉细砂 7.70 22.60 1.40 48.20 3.52 0.15 13.7±1.5 S2272-3 5 29°35′21.7″ 90°14′20.1″ 断层上盘侧T3上部 距顶约80 cm含砾中粗砂 3.60 12.10 2.10 37.20 2.88 0.03 12.7±1.1 S2274-6 3 29°33′45.2″ 90°14′11.3″ 断层上盘T3顶部土壤化层 距顶约40 cm灰黄色细砂 3.70 12.20 2.80 16.00 3.34 0.02 4.9±0.5 S234-11 3 29°33.718′ 90°14.156′ 下盘侧T3的下伏T4基座 距顶约45 cm含砾中粗砂 4.40 11.10 2.63 138.52±7.78 5.40 4.73 25.7±1.8 S234-13 3 29°33.718′ 90°14.156′ 断层下盘侧，T4上部 距顶约75 cm含砾中细砂 4.20 19.90 2.23 126.76±9.07 5.52 12.69 22.9±1.9 S2274-1 3 29°33′45.2″ 90°14′11.3″ 断层下盘，T4上部土壤化层 距顶约55 cm中粗砂 4.70 15.30 2.10 49.20 3.37 0.02 14.7±1.1 S237-1 1 29°29.006′ 90°14.686′ 断层下盘侧，T5上部 距顶约2 m含砾中粗砂 8.17 23.80 2.18 424.57±11.43 7.26 9.14 58.4±2.7 S237-2 1 29°29.006′ 90°14.686′ 断层下盘侧，T5上部 距顶约240 cm中细砂 7.61 15.70 2.30 469.21±16.00 6.65 3.48 70.6±3.7 S234-3 3 29°33.829′ 90°14.279′ 断层上盘侧，T5上部 距顶约120 cm含砾中粗砂 3.98 16.00 2.31 374.13±12.84 5.43 4.03 68.9±3.6 S234-4 3 29°33.829′ 90°14.279′ 断层上盘侧，T5上部 距顶约40 cm含砾中粗砂 3.10 13.00 2.26 301.66±23.13 4.80 4.09 62.8±5.4 S2272-6 5 29°35′21.7″ 90°14′20.1″ 断层上盘T6上部土壤化层 距顶约85 cm灰黄色细砂 5.50 14.90 1.50 132.00 2.89 0.11 45.4±4.2 SA-1 3 29°33.718′ 90°14.156′ T2断崖探槽剖面层① 灰黄色含砾砂土 5.55 28.40 2.91 82.80±0.44 7.53 2.77 11.0±0.4 SA-2 3 29°33.718′ 90°14.156′ T2断崖探槽剖面层② 含砾中粗砂 9.46 16.00 2.92 80.76±4.38 7.65 9.47 10.5±0.7 SA-5 3 29°33.718′ 90°14.156′ T2断崖探槽剖面层⑤ 灰白色含砾中粗砂 5.85 24.40 2.95 49.83±1.79 7.47 5.21 6.7±0.4 SA-6 3 29°33.718′ 90°14.156′ T2断崖探槽剖面层⑥ 灰黄色中粗砂 10.20 19.00 2.75 27.18±1.11 8.11 6.62 3.4±0.2 SA-7 3 29°33.718′ 90°14.156′ T2断崖探槽剖面层⑥ 灰黄色含砾中粗砂 10.60 24.40 2.72 13.55±0.44 8.95 2.83 2.6±0.1 SA-8 3 29°33.718′ 90°14.156′ T2断崖探槽剖面层⑧ 灰黄色含砾中粗砂 5.97 25.10 2.51 8.57±0.70 7.08 6.42 1.2±0.0 SA-9 3 29°33.718′ 90°14.156′ T2断崖探槽剖面层⑧ 灰黄色含砾中粗砂 18.30 93.00 2.90 13.74±0.50 18.12 6.80 0.8±0.0 SB-1 3 29°33.718′ 90°14.156′ T1断崖探槽剖面层① 灰黄色含砾中粗砂 6.50 41.50 2.84 39.60±1.14 9.02 9.13 4.4±0.2 SB-2 3 29°33.718′ 90°14.156′ T1断崖探槽剖面层① 含砾中细砂 3.32 12.30 3.11 16.25±0.86 5.48 8.15 3.0±0.2 SB-3 3 29°33.718′ 90°14.156′ T1断崖探槽剖面层② 含砾中细砂 3.00 13.00 2.78 6.35±0.65 5.10 9.80 1.2±0.1 14C年龄样品及测年结果 野外编号 观察点 北纬 东经 地貌部位 岩性 备注 年龄 S234-16 3 29°33.718′ 90°14.156′ 断层上盘侧，T3顶部土壤化层 距顶约35 cm灰黑色含碳质砂土 3 525±75 a B.P. SA-3 3 29°33.718′ 90°14.156′ T2断崖探槽剖面层③、⑤之间 碳屑 6 050±75 a B.P. SA-3 3 29°33.718′ 90°14.156′ T2断崖探槽剖面层③、⑤之间 碳屑 树轮校正年龄 6 895±103 a B.P. SA-4 3 29°33.718′ 90°14.156′ T2断崖探槽剖面层③、⑤之间 碳屑 树轮校正年龄 4 775±10 a B.P. SA-4 3 29°33.718′ 90°14.156′ T2断崖探槽剖面层③、⑤之间 碳屑 4 030±75 a B.P. 注：观察点及编号与图 2对应.
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