Surface Ruptures in the Northwest of the Outer Aso Caldera
Surface Ruptures in the Northwest of the Outer Aso Caldera
复制标题
外阿苏火山口西北部的地表破裂
DOI：
10.1007/978-981-19-1150-7_15
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发表时间：
2022
期刊：
影响因子：
--
通讯作者：
H.
中科院分区：
文献类型：
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作者：
Une;H.;Nakano;T.;Fujiwara;S.;Sato;H.P.;Yagi;H.
Fujiwara等人使用ALOS-2 SAR图像从SAR干涉分析中检测到与2016年熊本地震序列相关的地表位移场，并将干涉图中的线性不连续性映射为“位移线性要素（DL）”。在阿索火山口外缘的西北部地区，从西北偏西到东南偏东，有数十个平行的DL被指出。每个DL的长度主要为3-5公里。每个破裂之间的水平间距约为0.5-1公里，从干涉图中的不连续性判断的位移主要是10厘米左右的倾向滑动。虽然许多DL出现沿着已知的活动断层，但其中一些出现在没有构造地貌特征的地方。我们进行了一系列的实地调查，以澄清这些DL的表面变形在现场，并发现了十多个表面破裂沿着DL在地面上。这些破裂的位移小于几十厘米，与Fujiwara等人（2016）在位置、方向和滑动感方面的观察结果一致。在本章中，详细描述了九个这样的破裂的例子，并在地面上拍摄的照片。
Fujiwara et al. detected the surface displacement field associated with the 2016 Kumamoto earthquake sequence from the SAR interferometric analysis using ALOS-2 SAR images and mapped linear discontinuities in the interferograms as the “displacement lineaments (DLs).” Dozens of parallel DLs were pointed out in the area northwest of the outer rim of the Aso Caldera, running from west–northwest to east–southeast. The length of each DL is predominantly 3–5 km. The horizontal spacing between each rupture is approximately 0.5–1 km, and the displacements judged from the discontinuity in the interferograms are primarily around 10-cm dip slip. While many of the DLs appeared along the known active faults, some of them appeared where there are no tectonic geomorphic features. We conducted a series of field surveys to clarify the surface deformation of these DLs in situ and found more than ten surface ruptures along DLs on the ground. The displacement of these ruptures was less than a few tens centimeters, concordant with observations of Fujiwara et al. (2016) in terms of positions, directions, and slip senses. In this chapter, nine examples of such ruptures are described in detail with the photos taken on the ground.