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Geographical Information Systems is a useful tool for marine geohazard mapping. This paper describes an integrated and systematic map-based approach for identification and characterization of submarine landslide with multidis-ciplinary data such as multibeam bathymetric data, multichannel seismic data, sidescan sonar and so on. Taking Liwan 3-1 gas...
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... multi-disciplinary and heterogeneous marine geo- hazard data, in digital format, are ideally suited for storage, compilation, spatial analysis and visualization in a GIS- based framework (Fig. 1). and can be further interpreted to provide critical information on the location, distribution, susceptibility, vulnerability and probability associated with marine ...
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Citations
... [8] described that profile curvature could depict seabed features which are parallel to the slope and could reveal the acceleration of the flow on the seafloor (e.g., benthic, lava, or landslide). Thus, along-slope ridges and crests are able to reveal using this method [10]. ...
A new multibeam dataset of Nieuwerkerk and Emperor of China (NEC) seamounts was acquired during the Jalacitra 2-2022 ”Banda” Expedition in the Banda Sea region. This study discusses a morphometric analysis of the seamounts based on a high-resolution bathymetry digital elevation model (DEM) and describes the morphometric features, namely: slope, profile curvature, and aspect. Morphological results indicate that the Nieuwerkerk seamount has an area of 2,416 km ² with a maximum peak elevation of approximately 3,460 m above the seabed and 357 m below the water surface. In the southwest of the Nieuwerkerk seamount, two new seamounts were discovered, which are still unnamed and seem morphologically connected to the Nieuwerkerk seamount. Each of the seamounts covers an area of 148 km ² and 220 km ² , respectively, with a maximum peak elevation of approximately 2,338 m and 2,053 m above the seabed. Additionally, both seamounts have an elevation of 1,878 m and 2,017 m below the sea surface. Meanwhile, the Emperor of China seamount is located southwest of the three formerly mentioned seamounts, with the maximum peak seats at 2,165 m below the sea surface. Seamount C is located in the west of the surveyed area and it covers an area of 95.6 km ² with an elevation of 1,834 m above the seabed. The results of regression analysis indicate that all of the features could be used for the morphological classification.
... The failure sources are recognised nonetheless by the existence of giant submarine landslides in both the northern and southern SCS (Sun et al., 2018). The central region of the northern SCS shelf margin has generated numerous submarine landslides in the past (Su et al., 2015), such as the Baiyun slide complex, some of which being probably tsunamigenic (Sun and Huang, 2014). Along the S SCS margin, the continental shelf off the west coast of Sabah (NW Borneo) is underlain by a clastic sedimentary wedge ~250 km long, 100 km wide and up to 12 km thick. ...
Palaeotsunami research in the Sino-Pacific region has increased markedly following the 2011 Tōhoku-oki tsunami. Recent studies encompass a variety of potential sources and cover a full range of research activities from detailed studies at individual sites through to region-wide data collation for the purposes of database development. We synthesise palaeotsunami data from around the region drawing on key examples to highlight the progress made since 2011. We focus on a wide range of spatial and temporal scales, from region-wide to local events, from multi-millennial site records to estimates of magnitude and frequency along national coastlines. The review is based on sub-regions but in reviewing the combined records highlights common events and anomalies. In doing so we identify future research opportunities and notable findings arising from our review.
In this paper, we take DLW3101 core obtained at the top of the canyon (no landslide area) and DLW3102 core obtained at the bottom of the canyon (landslide area) on the northern continental slope of the South China Sea as research objects. The chronostratigraphic framework of the DLW3101 core and elemental strata of the DLW3101 core and the DLW3102 core since MIS5 are established by analyzing oxygen isotope, calcium carbonate content, and X-Ray Fluorescence (XRF) scanning elements. On the basis of the information obtained by analyzing the sedimentary structure and chemical elements in the landslide deposition, we found that the DLW3102 core shows four layers of submarine landslides, and each landslide layer is characterized by high Si, K, Ti, and Fe contents, thereby indicating terrigenous clastic sources. L1 (2.15–2.44 m) occurred in MIS2, which is a slump sedimentary layer with a small sliding distance and scale. L2 (15.48–16.00 m) occurred in MIS5 and is a debris flow-deposited layer with a scale and sliding distance that are greater than those of L1. L3 (19.00–20.90 m) occurred in MIS5; its upper part (19.00–20.00 m) is a debris flow-deposited layer, and its lower part (20.00–20.90 m) is a sliding deposition layer. The landslide scale of L3 is large. L4 (22.93–24.27 m) occurred in MIS5; its upper part (22.93–23.50 m) is a turbid sedimentary layer, and its lower part (23.50–24.27 m) is a slump sedimentary layer. The landslide scale of L4 is large.
Extending across some 3.5 million square km and with coastlines populated by in excess of 80 million people, the South China Sea (SCS) is bordered by seven independent states. Understanding the risk of tsunamis in the SCS is therefore an imperative, especially given the new priorities for the science community following the endorsement by the UN General Assembly of the Sendai Framework for Disaster Risk Reduction 2015–2030. Our review presents a synthesis of existing literature on the current state of knowledge concerning known tsunamigenic threats, but also highlights a number of other potential sources that have so far received less attention or gone largely un- or under-recognised.
