Indonesian Throughflow as a preconditioning mechanism for submarine landslides in the Makassar Strait

Indonesian Throughflow as a preconditioning mechanism for submarine landslides in the Makassar Strait
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印度尼西亚通流作为望加锡海峡海底滑坡的预处理机制

DOI:
10.1144/sp500-2019-171
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发表时间:
2020
期刊:
Geological Society, London, Special Publications
影响因子:
--
通讯作者:
Brackenridge R
Brackenridge R
中科院分区:
--
文献类型:
--
作者:
Brackenridge R

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马卡萨尔海峡是一个重要的海洋门户,印度尼西亚洋流(ITF)的主要分支通过该海峡将水从太平洋输送到印度洋。这项研究确定了一些中等(> 10公里3),以巨大的(高达650公里3)质量运输存款内的马卡萨尔北盆地更新世-最近的部分。形成这些沉积物的大多数海底滑坡来自Mahakam前三角洲,最大的滑坡向南倾斜。我们看到了洋流侵蚀、横向搬运和等深流沉积在上斜坡的明显证据。这表明,ITF是作为一个沿斜坡输送带,运输沉积物的三角洲南部,在那里快速沉积速率和坡度过陡导致经常性的海底滑坡。一个频率为> 100 km 3故障暂定为0.5 Ma,与较小的事件发生至少每160 ka。因此,这一地区可能容易受到这些海底滑坡产生的海啸的影响。我们确定了历史断层破裂引发的海啸(位于沿着帕卢-科罗断层带)和地下物质运输沉积物分布之间的差异。如果这些新发现的大规模故障是海啸,它们可能代表了该地区以前被忽视的危险。
The Makassar Strait is an important oceanic gateway, through which the main branch of the Indonesian Throughflow (ITF) transports water from the Pacific to the Indian Ocean. This study identifies a number of moderate (> 10 km 3) to giant (up to 650 km 3) mass transport deposits within the Makassar North Basin Pleistocene–Recent section. The majority of submarine landslides that formed these deposits originated from the Mahakam pro-delta, with the largest skewed to the south. We see clear evidence for ocean-current erosion, lateral transport and contourite deposition across the upper slope. This suggests that the ITF is acting as an along-slope conveyor belt, transporting sediment to the south of the delta, where rapid sedimentation rates and slope oversteepening results in recurring submarine landslides. A frequency for the> 100 km 3 failures is tentatively proposed at 0.5 Ma, with smaller events occurring at least every 160 ka. This area is therefore potentially prone to tsunamis generated from these submarine landslides. We identify a disparity between historical fault rupture-triggered tsunamis (located along the Palu-Koro fault zone) and the distribution of mass transport deposits in the subsurface. If these newly identified mass failures are tsunamigenic, they may represent a previously overlooked hazard in the region.
硅质沉积物中热触发减容反应引起的多边形断层阵列的引发和传播
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