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all geography including DSDP/ODP Sites and Legs
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Africa
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Plantae
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Spermatophyta
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Tertiary
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Pliocene
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Paleogene
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Tallahatta Formation (1)
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Mesozoic
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Jurassic
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Triassic
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MIS 5 (1)
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Paleozoic
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Primary terms
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Cenozoic
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Tertiary
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Pliocene
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Paleogene
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Invertebrata
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Echinodermata
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Jurassic
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Triassic
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GeoRef Categories
Era and Period
Epoch and Age
Book Series
Date
Availability
storms
Experimental vs. natural fulgurite: A comparison and implications for the formation process Open Access
What is a geohazard? Available to Purchase
Turbidity currents regulate the transport and settling of microplastics in a deep-sea submarine canyon Available to Purchase
Landslide Warning Area Delineation through Seismic Signals and Landslide Characteristics: Insights from the Silabaku Landslide in Southern Taiwan Available to Purchase
Disturbance and recovery of physical elements of habitat in relation to post-wildfire channel sedimentation, southern California Transverse Ranges Available to Purchase
ABSTRACT Sedimentation after wildfire is a profound disturbance to the biogeomorphic character of fluvial systems. Despite this significant alteration, field data focusing on the geomorphic processes and bed morphology that form the physical structure of habitat are limited, especially over a longer-term perspective. We report results of detailed field studies following two wildfires in the same steep fluvial system in the southern California Transverse Ranges three decades apart. Substantial channel sedimentation during storms following both fires altered physical elements of habitat, which included bed elevation, step height and spacing, pool depth and spacing, grain-size distribution (D 84), and transport capacity (τ o /τ c). The postfire sediment deposits buried bedforms, decreased D 84 , and increased τ o /τ c by an order of magnitude. Incision during subsequent storms initiated recovery that depended on the attributes of post-wildfire climate variability that characterize the semiarid Mediterranean-type environment. Step-pool bedforms reappeared or reformed during the decades between wildfires as the relatively fine gravel-sized post-wildfire sediment was transported downstream, thus reestablishing the physical elements of habitat characterizing the dynamic system.
Precursors to a continental-arc ignimbrite flare-up: Early central volcanoes of the San Juan Mountains, Colorado, USA Open Access
The Seismic Record of Wind in Alaska Available to Purchase
Potential of Cave Sediments as a Proxy for Tropical Cyclone and Storm Activity Available to Purchase
Hydrogeologic controls on barrier island geomorphology: Insights from electromagnetic surveys Available to Purchase
200 Years of Fossil Fuels and Climate Change (1900-2100) Available to Purchase
Sediment routing in an incised valley during Hurricane Harvey (2017) in Houston, Texas, USA: Implications for modern sedimentation Open Access
Infrasound Observations at Bahía de Banderas, Western Mexico Available to Purchase
Characteristics of Background Noise in the Oldest‐1 Array Deployed on the Oldest Part of the Pacific Plate Available to Purchase
A Climatic Surprise – Slope Instability Triggered by Heavy Rain in Maldevta Region, Dehradun, Uttarakhand, on 20 August, 2022 Available to Purchase
Rapid coastal erosion of ice-bonded deposits on Pelly Island, southeastern Beaufort Sea, Inuvialuit Settlement Region, western Canadian Arctic Available to Purchase
Geological controls on dispersal and deposition of river flood sediments on the Hidaka shelf, Northern Japan Available to Purchase
Abstract The distribution and characteristics of marine surface sediments are a basic marine geological information. Large river floods are a frequent natural hazard that transport substantial terrigenous sediments into the marine environment. In August 2003, TY ETAU (0310) caused heavy rainfall in the southern coast of Hokkaido, north Japan, where some mountainous rivers in the Hidaka region flooded. Two deposition modes for the 2003 flood sediments can be identified by comparing the pre- and post-flood surface sediment distribution. Shore-normal shallow depressions off the mouth of the Saru and Atsubetsu rivers served as channels for the discharged floodwater preventing dispersion and maintaining the necessary water density to transport the materials as density bottom currents. This action also promoted long-distance transport of flood materials across the continental shelf. Absence of depression on the inner shelf off the mouth of the Niikappu and Shizunai rivers may have dispersed floodwaters near the river mouth and deposited the flood materials close to the shore. Marine geological mapping suggests that the differences in submarine topography (the presence or absence of shallow depressions) are closely related to the regional geological structure. Thus, submarine geology is a controlling factor of the seafloor environments influenced by the river flood.
Global sea-level rise increased during the twentieth century from 1.5 to 3.0 mm/yr and is expected to at least double over the next few decades. The Western Louisiana and Texas coast is especially vulnerable to sea-level rise due to low gradients, high subsidence, and depleted sediment supply. This Memoir describes the regional response of coastal environments to variable rates of sea-level rise and sediment supply during Holocene to modern time. It is based on results from more than six decades of research focused on coastal and nearshore stratigraphic records. The results are a wake-up call for those who underestimate the potential magnitude of coastal change over decadal to centennial time scales, with dramatic changes caused by accelerated sea-level rise and diminished sediment supply.