scholarly journals Sedimentary facies and depositional frequency of sediment gravity flow deposits generated by flood and slope failure in a lacustrine varved sediments of the Middle Pleistocene Hiruzenbara Formation, southwest Japan

2015 ◽  
Vol 74 (1) ◽  
pp. 45-53
Author(s):  
Hana Sasaki ◽  
Yoshiro Ishihara ◽  
Yasunori Sasaki ◽  
Megumi Saito-Kato ◽  
Hajime Naruse
Keyword(s):  
Slope Failure ◽  
Sedimentary Facies ◽  
Gravity Flow ◽  
Middle Pleistocene ◽  
Southwest Japan ◽  
Varved Sediments ◽  
Sediment Gravity Flow

Bed-thickness frequency distributions and recurrence intervals of sediment-gravity-flow deposits intercalated in lacustrine varved diatomite: examples from the middle Pleistocene Hiruzenbara Formation, southwest Japan

2020 ◽  
Vol 90 (6) ◽  
pp. 561-572
Author(s):  
Hana Sasaki ◽  
Yasunori Sasaki ◽  
Megumi Saito-Kato ◽  
Hajime Naruse ◽  
Yoshiro Ishihara
Keyword(s):  
Power Law ◽  
Slope Failure ◽  
Gravity Flow ◽  
Middle Pleistocene ◽  
Southwest Japan ◽  
Frequency Distributions ◽  
Base Section ◽  
Sediment Gravity Flow ◽  
Recurrence Intervals ◽  
Bed Thickness

ABSTRACT Bed-thickness frequency distributions of sediment-gravity-flow deposits, especially turbidites, are one of the major interests of sedimentology. Lognormal, power-law, exponential, and truncated normal distributions have all been proposed for their frequency distributions. Although these frequency distributions have been obtained from many field observations and estimated from statistical models, problems associated with the complexity of sedimentary processes have remained. In this study, bed-thickness frequency distributions and the recurrence intervals of sediment-gravity-flow deposits intercalated in the Pleistocene lacustrine varved diatomite in southwest Japan were analyzed. The results reveal that the bed thicknesses of sediment-gravity-flow deposits induced by different mechanisms show different types of frequency distribution. For example, flood-induced sediment-gravity-flow deposits show power-law-like distributions, whereas such deposits caused by lake-slope-failure show lognormal distributions. The suggestion is that flood-induced types are deposited from floods having a power-law scale. However, the bed thicknesses of the deposits induced by lake-slope-failure do not purely reflect the event scale, because the lateral variation of their thicknesses reflects the depositional processes. The recurrence intervals of both types of event show Poisson-like distributions except for lake-slope-failure deposits at the slope-base section. Despite observed ranges, the distributions of lake-slope-failure deposits at the slope-base section have a high amount of zero value and the recurrence interval show exponentially decreasing. These results suggest that both events were generated randomly, despite different origins. In addition, the incompleteness of the records was also suggested from sediment bypass of a lake-slope-failure event at the slope-base section.

scholarly journals Sediment-gravity flow deposits and related deep-sea sedimentary facies along the Nichinan Coast, SE Kyushu

2014 ◽  
Vol 120 (Supplement) ◽  
pp. S41-S62 ◽  
Author(s):  
Yoshiro Ishihara ◽  
Yasuhiro Takashimizu ◽  
Dan Matsumoto ◽  
Yuichiro Miyata
Keyword(s):  
Deep Sea ◽  
Sedimentary Facies ◽  
Gravity Flow ◽  
Sediment Gravity Flow

Causes of varied sediment gravity flow types on the Alsek Prodelta, northeast Gulf of Alaska

1988 ◽  
Vol 7 (4) ◽  
pp. 317-342 ◽  
Author(s):  
William C. Schwab ◽  
Homa J. Lee ◽  
Bruce F. Molnia
Keyword(s):  
Gulf Of Alaska ◽  
Gravity Flow ◽  
Sediment Gravity Flow

Slumping and a sandbar deposit at the Cretaceous-Tertiary boundary in the El Tecolote section (northeastern Mexico): An impact-induced sediment gravity flow

Geology ◽  
2001 ◽  
Vol 29 (3) ◽  
pp. 231 ◽  
Author(s):  
Ana R. Soria ◽  
Carlos L. Liesa ◽  
Maria Pilar Mata ◽  
José A. Arz ◽  
Laia Alegret ◽  
...  
Keyword(s):  
Gravity Flow ◽  
Sediment Gravity Flow ◽  
Northeastern Mexico

scholarly journals Discovery of an early Middle Pleistocene marker tephra around the Ariake Bay area, Southwest Japan

2012 ◽  
Vol 118 (11) ◽  
pp. 709-722 ◽  
Author(s):  
Shoichi Shimoyama ◽  
Hirohisa Matsuura ◽  
Kiyohide Mizuno ◽  
Masakazu Kubota ◽  
Takenori Hino ◽  
...  
Keyword(s):  
Middle Pleistocene ◽  
Ariake Bay ◽  
Southwest Japan ◽  
Bay Area
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