Revealing the distribution of active submarine faults off the coast of Oga Peninsula using high-resolution stereoscopic topographic images
Revealing the distribution of active submarine faults off the coast of Oga Peninsula using high-resolution stereoscopic topographic images
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利用高分辨率立体地形图像揭示男鹿半岛沿岸活动海底断层的分布
DOI：
10.1016/j.geomorph.2022.108465
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发表时间：
2022
期刊：
影响因子：
3.9
通讯作者：
Takashi Nakata
中科院分区：
文献类型：
--
作者：
Hideaki Goto;Hikaru Moriki;Takashi Kumamoto;Takashi Nakata
这项研究的目的是阐明利用高分辨率立体地形图像和地震剖面解释相结合的构造地貌解释作为组织海底活动断层分布图的方法标准的重要性。此外，我们还提供了位于日本海东部边缘的大贺半岛近海活动的海底反向断层的地形证据。首先，对多波束测深数据的点云数据进行再处理，生成新的数字测深模型和浮雕图像。这些图像和等高线图能够识别广泛的变形和其他小规模的构造地貌，如断层崖、盆地平面上的断层崖和挠曲崖。我们首先描述了横跨莫加米海槽的北东-西南向北西向断层的详细构造地貌，这是先前的地质研究确定的，以证明所提出的方法的有效性。并将该方法应用于欧加半岛近海东倾断裂构造地貌的地震剖面解释。结果表明，根据地质和地形特征，可以识别出横跨莫加米海槽中部的活动断裂。然而，识别延伸到海槽北端沉积较差地区的活动断层是困难的。研究发现，利用高分辨率地形数据的立体图像，通过构造地貌解释来探测活动断层的分布是可行和有效的。此外，通过识别挠曲陡坎并与地震剖面对比，在莫上海槽西北部东缘发现了一条新的东倾逆断层，即Kyurokujima-Nansei-oki断层。Kyurokujima-Nansei-oki断裂的走向与1983年中日本海地震西南部的余震分布平行，类似于东倾构造。因此，在评估地震和海啸危害时，该断层应被视为震源断层之一。
This study aims to elucidate the importance of a combination of tectonic geomorphological interpretations using high-resolution stereoscopic topographic images and seismic profile interpretations as methodological standards for organizing maps of the distribution of active submarine faults. Furthermore, we provide topographic evidence of active submarine reverse faults off the coast of the Oga Peninsula, which lies on the eastern margin of the Japan Sea. First, the study reprocessed the point cloud data of multi-beam bathymetry data and produced a new digital bathymetry model and anaglyph images. These images and contour maps enabled the identification of broad deformation and other small-scale tectonic landforms, such as fault scarp, fault scarp on the flat surface of a basin, and flexure scarp. We first described detailed tectonic landforms along the NE–SW trending northwest-dipping faults across the Mogami Trough, which was identified by previous geological studies, to demonstrate the effectiveness of the proposed method. Moreover, we applied the method as an applicable example for tectonic landforms in the east-dipping fault at the offshore of the Oga Peninsula with seismic profile interpretation. The result demonstrated that an active fault across the central part of the Mogami Trough can be recognized on the bases of geology and topography. However, identifying an active fault that extends to the area with poor sediment deposition at the northern end of the trough is difficult. The study found that detecting active fault distribution by tectonic geomorphological interpretation is practical and effective using a stereoscopic image from high-resolution topographical data. Moreover, a new east-dipping reverse fault, that is, the Kyurokujima-nansei-oki fault, was discovered along the eastern margin of the northwestern part of the Mogami Trough by identifying flexure scarp and comparison with seismic profiles. The strike of the Kyurokujima-nansei-oki fault is parallel to that of the aftershock distribution of the southwest part of the 1983 Central Japan Sea Earthquake and resembles an east-dipping structure. Thus, this fault should be considered one of the source faults during assessments of seismic and tsunami hazards.
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