Characterizing an unstable mountain slope using shallow 2D and 3D seismic tomography
Characterizing an unstable mountain slope using shallow 2D and 3D seismic tomography
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DOI：
10.1190/1.2338823
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发表时间：
2006-11
期刊：
影响因子：
3.3
通讯作者：
B. Heincke;H. Maurer;A. Green;H. Willenberg;T. Spillmann;L. Burlini
中科院分区：
文献类型：
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作者：
B. Heincke;H. Maurer;A. Green;H. Willenberg;T. Spillmann;L. Burlini
随着山区交通路线和人口中心的扩大，与崩塌和山体滑坡相关的风险以惊人的速度增长。因此，迫切需要以安全和非侵入性的方式划定易发生灾难性坍塌的山坡。为此，我们发展了三维层析地震折射技术，并将其应用于一个不稳定的高山斜坡，其中很大一部分以每年0.01-0.02m/年的速度向邻近的谷底移动。在长(0.2米)到长(>；100米)炮检距处，在裸露的片麻状岩体的大片麻状岩体中记录到的首波具有极低的视速度。初至旅行时的反演产生了3D层析图像，揭示了大量极低质量岩石的存在，P波速度在500-2700m/S之间。这些值与实验室测得的5400m/S的水平P波平均速度相比低得惊人。
As transport routes and population centers in mountainous areas expand, risks associated with rockfalls and rockslides grow at an alarming rate. As a consequence, there is an urgent need to delineate mountain slopes susceptible to catastrophic collapse in a safe and noninvasive manner. For this purpose, we have developed a 3D tomographic seismic refraction technique and applied it to an unstable alpine mountain slope, a significant segment of which is moving at 0.01–0.02 m∕year toward the adjacent valley floor. First arrivals recorded across an extensive region of the exposed gneissic rock mass have extraordinarily low apparent velocities at short (0.2 m) to long (>100 m) shot-receiver offsets. Inversion of the first-arrival traveltimes produces a 3D tomogram that reveals the presence of a huge volume of very-low-quality rock with ultralow to very low P-wave velocities of 500–2700 m∕s . These values are astonishingly low compared to the average horizontal P-wave velocity of 5400 m∕s determined from labora...