10Be dating and seismic origin of Luanshibao rock avalanche in SE Tibetan Plateau and implications on Litang active fault
10Be dating and seismic origin of Luanshibao rock avalanche in SE Tibetan Plateau and implications on Litang active fault
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青藏高原东南部乱石堡岩崩的10Be测年、地震成因及其对理塘活动断裂的意义
DOI：
10.1007/s10346-019-01319-z
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发表时间：
2019-12
期刊：
影响因子：
6.7
通讯作者：
Luqing Zhang
中科院分区：
文献类型：
--
作者：
Qingli Zeng;Guangxiang Yuan;Timthy Davies;Bing Xu;Rongqiang Wei;Xinyu Xue;Luqing Zhang
中-大地震通常会引发大量滑坡。通过对史前大型滑坡的分析，可以确定其地震成因的可能性，并进一步识别为断裂活动性和地震强度的指示。在野外调查、高分辨率卫星图像解译和滑坡存款宇宙成因暴露测年的基础上，提出了藏东南地区一次大型、长时间的乱石堡崩塌（LSB崩塌）。研究表明：（1）LSB岩崩跨理塘走滑活动断裂，堆积在第四纪开阔平坦的茅垭盆地上，存款量为67 Mm 3，表观摩擦系数为0.22。(2)从存款近端到中部共8个花岗岩块体的地球宇宙成因核素测年结果表明，LSB岩崩的~（10）Be平均暴露年龄为3510±346 a B. P.;（3）LSB岩崩、第四纪沉积物与理塘活动断裂的时空交切关系，表明茅垭盆地发生了5次较强的古地震事件，（4）根据滑坡体体积与地震震级的经验关系式，对应的最大震级可达MW7.1 ±0.1。研究结果表明，理塘断裂茂崖段可能是最危险的地段，其大型同震滑坡密度较大，可为川藏铁路选线提供参考。
Moderate-large earthquakes usually trigger a large number of landslides. The prehistoric large landslides can be analyzed to determine the probability of its seismic origin, and further recognized as an indicator of fault activity and earthquake intensity. Based on field investigation, high-resolution satellite image interpretation and cosmogenic exposure dating of landslide deposit, the paper presents a large, long-runout Luanshibao rock avalanche (the LSB rock avalanche), southeast Tibet. The study reveals that: (1) the LSB rock avalanche straddles the Litang active strike-slip fault and deposits on the open-flat Quaternary Maoya basin, with a deposit volume of 67 Mm3 and an apparent coefficient of friction of 0.22. (2) totally 8 granite blocks from the proximal to the medial part of deposit dated by the Terrestrial Cosmogenic Nuclide method suggests an average 10Be exposure age of 3510±346 a B.P. for the LSB rock avalanche; (3) the spatial-temporal intercutting relationships among the LSB rock avalanche, Quaternary sediments and the Litang active fault, suggests 5 strong paleoseismic events in the Maoya basin, which is temporally accordance to the result defined by paleoearthquake-trench research; (4) the corresponding maximum magnitude could reach MW 7.1±0.1 by the empirical equations between landslide volume and earthquake magnitude. It suggests that the Maoya section of Litang fault is probably more dangerous than other sections due to the high density of large co-seismic landslides, which could present useful reference for the alignment selection of future Sichuan-Tibet railway.
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中国青藏高原地震引发的巨型乱石堡滑坡的长期运行有多不寻常？
影响因子：
3.9
作者：
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DOI：
10.1016/b978-0-12-396452-6.00001-x
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期刊：
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作者：
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影响因子：
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作者：
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