Depositional Patterns of the Mississippi Fan Surface: Evidence from GLORIA II and High-Resolution Seismic Profiles

1991 ◽  
pp. 349-363 ◽  
Author(s):  
David C. Twichell ◽  
Neil H. Kenyon ◽  
Lindsay M. Parson ◽  
Bonnie A. McGregor
Keyword(s):  
High Resolution ◽  
Seismic Profiles ◽  
Depositional Patterns

Morphology and geological setting of Iseo Lake (Lombardy) through multibeam bathymetry and high-resolution seismic profiles

2007 ◽  
Vol 100 (1) ◽  
pp. 23-40 ◽  
Author(s):  
Alfredo Bini ◽  
Daniele Corbari ◽  
Paolo Falletti ◽  
Mauro Fassina ◽  
Cesare R. Perotti ◽  
...  
Keyword(s):  
High Resolution ◽  
Multibeam Bathymetry ◽  
Seismic Profiles ◽  
Geological Setting

Sand Wave Migration and its Factors on Giant Sand Ridge in Taiwan Strait

2020 ◽  
Author(s):  
Yin-Hsuan Liao ◽  
Ho-Han Hsu ◽  
Jyun-Nai Wu ◽  
Tzu-Ting Chen ◽  
Eason Yi-Cheng Yang ◽  
...  
Keyword(s):  
High Resolution ◽  
Taiwan Strait ◽  
Sand Wave ◽  
Sand Ridge ◽  
Elevation Change ◽  
Seismic Profiles ◽  
Migration Patterns ◽  
Sand Waves ◽  
And Migration ◽  
Wave Migration

<p>        Submarine sand waves are known to be induced by tidal currents and their migration has become an important issue since it may affect seafloor installations. In Taiwan Strait, widely spreading sand waves have been recognized on the Changyun Ridge, a tide-dominated giant sand ridge offshore western Taiwan. However, due to lacking of high-resolution and repeated geophysical surveys before, detailed characteristics and migrating features of the sand waves in Taiwan Strait were poorly understood. As new multibeam bathymetric and seismic data were collected repeatedly during 2016 - 2018 for offshore wind farm projects, we can now advance the understanding of sand wave characteristics and migration patterns in the study area. We apply a geostatistical analysis method on bathymetry data to reveal distribution and spatial characteristics of the sand waves, and estimate its migration pattern by using an updated spatial cross-correlation method. Then, sedimentary features, internal structures and thicknesses of sand waves are observed and estimated on high-resolution seismic profiles. Our results show that the study area is mostly superimposed by multi-scaled sandy rhythmic bed forms. However, the geomorphological and migrating characteristics of the sand waves are complicated. Their wavelengths range from 80 to 200 m, heights range from 1.5 to 8 m, and crests are generally oriented in the WNW-ESE direction. Obvious sand wave migration was detected from repeated high-resolution multi-beam data between 2016 and 2018, and migration distances can be up to ~150 m in 15 months. The average elevation change of the seafloor over the whole survey area is ~3.0 m, with a maximum value of 6.9 m. Moreover, the sand waves can migrate over 30 m with ~2.5 m elevation change in 2 months and migrate over 5 m with ~1 m elevation change in 15 days. The results also show that the orientation of wave movement can be reversed even within a small distance. By identifying the base of sand wave on seismic profiles, the thicknesses of sand waves are found ranging from 1 to 10 meters. The base of wave structure become slightly deeper from nearshore to offshore. Our results indicate that the thickness of sand waves increases with degree of asymmetry and migration rate. By bathymetric and reflection seismic data analyses, systematic spatial information of sand waves in the study area are established, and we suggest that not only tidal currents can affect sand wave migration patterns, but also wave structures and thicknesses play important roles in sand wave migrating processes and related geomorphological changes.</p>

Deepwater high-resolution expanding spread and split spread seismic profiles in the Nankai Trough

1992 ◽  
Vol 97 (B2) ◽  
pp. 1687-1713 ◽  
Author(s):  
P. L. Stoffa ◽  
W. T. Wood ◽  
T. H. Shipley ◽  
G. F. Moore ◽  
E. Nishiyama ◽  
...  
Keyword(s):  
High Resolution ◽  
Nankai Trough ◽  
Seismic Profiles

scholarly journals Active tectonics of the Calabrian subduction revealed by new multi-beam bathymetric data and high-resolution seismic profiles in the Ionian Sea (Central Mediterranean)

2017 ◽  
Vol 461 ◽  
pp. 61-72 ◽  
Author(s):  
Marc-André Gutscher ◽  
Heidrun Kopp ◽  
Sebastian Krastel ◽  
Gerhard Bohrmann ◽  
Thierry Garlan ◽  
...  
Keyword(s):  
High Resolution ◽  
Active Tectonics ◽  
Ionian Sea ◽  
Seismic Profiles ◽  
Central Mediterranean ◽  
Bathymetric Data

scholarly journals THE PALEO-ENVIRONMENTAL SETTING OF SEPETIBA BAY, RIO DE JANEIRO, BRAZIL, IN THE LATE PLEISTOCENE: INTERPRETATIONS FROM HIGH-RESOLUTION SEISMIC STRATIGRAPHY

2015 ◽  
Vol 33 (4) ◽  
Author(s):  
Heloisa Vargas Borges ◽  
Charles A. Nittrouer
Keyword(s):  
High Resolution ◽  
Late Pleistocene ◽  
Seismic Data ◽  
Rio De Janeiro ◽  
Single Channel ◽  
Seismic Stratigraphy ◽  
Seismic Profiles ◽  
Sepetiba Bay ◽  
Environmental Setting ◽  
Geological Evolution

ABSTRACT. Single-channel high-resolution seismic profiles in Sepetiba Bay, Brazil, were collected to describe the recent geological evolution of this area. The seismic data showed... RESUMO. Perfis sísmicos de alta resolução da Baía de Sepetiba, Brasil, foram coletados com o objetivo de descrever a evolução geológica recente desta área. Os dados sísmicos...

scholarly journals Simultaneous Inversion of Shallow Seismic Data for Imaging of Sulfurized Carbonates

Minerals ◽  
2019 ◽  
Vol 9 (4) ◽  
pp. 203 ◽  
Author(s):  
Kamil Cichostępski ◽  
Jerzy Dec ◽  
Anna Kwietniak
Keyword(s):  
High Resolution ◽  
Sulfur Content ◽  
Signal To Noise Ratio ◽  
Seismic Inversion ◽  
Carbonate Sediments ◽  
Seismic Profiles ◽  
Simultaneous Inversion ◽  
Se Poland ◽  
Shallow Seismic ◽  
Seismic Surveying

In this article, we present a high-resolution shallow seismic surveying method for imaging the inner structure of the Miocene evaporitic formation, where sulfur ore occurs. The survey was completed in the northern part of the Carpathian Foredeep (SE Poland) where sulfur deposits occur up to a depth of ca. 260 m. In this region, the sulfur ore is strata-bound and exists within a carbonate interval of a thickness of approximately 28 m. The average sulfur content reaches up to 30%. Five seismic profiles were acquired with a total length of 2450 m. The acquisition was designed to obtain high-resolution, long offsets and a satisfactory signal-to-noise ratio. In the field, we used 48 channels and variable end-on roll-along spread that allowed us to record offsets of up to 375 m. Data processing was aimed at preserving relative amplitudes (known as RAP, relative amplitude preservation processing), an approach that is necessary for seismic inversion application. With the utilization of well log data and results of simultaneous inversion, we were able to calculate the elastic properties of the deposit to evaluate sulfur ore content and changes in lithology. The sulfur content is strongly dependent on the carbonate reservoir’s porosity. To evaluate porosity changes and associated sulfur content, a simultaneous inversion procedure was used. This is a pioneering approach in which we applied pre-stack inversion methods to shallow carbonate sediments.

Aspects of the geological history and structure of the northern Great Barrier Reef

1978 ◽  
Vol 291 (1378) ◽  
pp. 23-35 ◽  
Keyword(s):  
High Resolution ◽  
Drainage System ◽  
Complex Surface ◽  
Geological History ◽  
Barrier Reef ◽  
Seismic Profiles ◽  
Marine Transgression ◽  
Seismic Profiling ◽  
Holocene Transgression ◽  
Marine Terraces

Continuous high resolution seismic profiling of the continental shelf near Cairns between latitudes 16° 15' S and 16° 55' S to depths of 70-120 m revealed a sequence of varied lithologies with major and minor disconformities in both reef and non-reef accumulations. The most conspicuous sub-bottom reflector (I) is a complex surface formed through marine regression, shelf emergence, and subaerial erosion, which has been dissected by an ancient drainage system represented by sediment filled channels. It occurs at approximately — 67 m near Spur and Onyx reefs, has been deeply channelled below Trinity Opening, and generally rises towards the mainland. This surface marks a major disconformity representing a considerable hiatus in the development of the reef province, and has strongly influenced the distribution and thickness of both reefs and sedimentary accumulations formed during the succeeding marine transgression. While the age of reflector I is conjectural, the higher parts of this surface may have been emergent and non-depositional for longer periods than the lower parts, so that overlying sedimentary accumulations and reefs in contact with it may not be exactly contemporaneous. A continental slope terrace at approximately —116 m may reflect a late Wiirm low stand of sea level, and periods of still stand during the Holocene transgression, or minor regressions may be indicated by minor disconformities, and by the marine terraces and changes in slope which occur at several levels, the most conspicuous occurring at — 30 m on reefs of the marginal shelf. The seismic profiles illustrate the form and internal structure of some sedimentary units, and indicate that the present viable outer reefs are merely remnants of more extensive precursors.

Late-glacial fluctuations of two southern Patagonia outlet glaciers revealed by high-resolution seismic surveys

2020 ◽  
Vol 97 ◽  
pp. 111-124 ◽  
Author(s):  
Emanuele Lodolo ◽  
Jorge Lozano ◽  
Federica Donda ◽  
Donald Bran ◽  
Luca Baradello ◽  
...  
Keyword(s):  
High Resolution ◽  
Late Pleistocene ◽  
Late Glacial ◽  
Seismic Profiles ◽  
Seismic Surveys ◽  
Southern Patagonia ◽  
Minimum Age ◽  
General Phase ◽  
Lake Floor ◽  
Bathymetric Map

AbstractLago Argentino hosts various calving glaciers, among them the famous Perito Moreno. Whereas the onland late Pleistocene–Holocene glacial history is rather well constrained, the submerged glacier-related features were until now undisclosed. Here we present a series of high-resolution seismic profiles revealing moraine bodies associated with the late-glacial glacier dynamics and the first bathymetric map of the Brazo Rico and Brazo Sur, the two southern arms of Lago Argentino. At the eastern termination of Brazo Rico, we identified at the lake floor the submerged expression of the Puerto Bandera 3 moraine mapped onshore, which represents the oldest event (12,660 ± 70 cal yr BP oldest minimum age) recognized in this lake arm, and seven other younger events expressed by a series of terminal and recessional moraines. Along the Brazo Sur, few moraine bodies have been imaged by seismic data. Here, the youngest temporal constraint comes from the Frías moraine (ca. 6000 cal yr BP), which closes off the southern end of the Brazo Sur. At the confluence of the two arms, the Perito Moreno and the former Frías glacier merged and flowed toward east during their late-glacial maximum advance (i.e., Puerto Bandera 1 moraine). The subaqueous evidence of moraine bodies testifies to the occurrence of previously undocumented pulses of the Perito Moreno and former Frías glaciers within the general phase of late Pleistocene–Holocene regression.

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