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Publications

Browse more than 160,000 publications authored by our scientists over the past 100+ year history of the USGS.  Publications available are: USGS-authored journal articles, series reports, book chapters, other government publications, and more.

Filter Total Items: 175531

Challenging ring-current models of the Carrington storm Challenging ring-current models of the Carrington storm

A detailed analysis is made of horizontal-component geomagnetic-disturbance data acquired at the Colaba observatory in India recording the Carrington magnetic storm of September 1859. Prior to attaining its maximum absolute value, disturbance at Colaba increased with an e-folding timescale of 0.46 hr (28 min). Following its maximum, absolute disturbance at Colaba decreased as a trend...
Authors
Jeffrey J. Love, Kalevi Mursula

Predicting the persistence of salamanders: consequences of phenological shifts for species of management concern on DoD lands Predicting the persistence of salamanders: consequences of phenological shifts for species of management concern on DoD lands

As climate change effects intensify, key life history events may become decoupled from necessary biotic and abiotic resources. For species of management concern on Department of Defense (DoD) lands, these shifts in phenology may prove difficult to address without a mechanistic understanding of the drivers of such changes. We sought to determine the causes and effects of phenological...
Authors
Susan Walls, Thomas L. Anderson, Houston C. Chandler, Carola A. Haas, Jon M. Davenport

Field evidence and indicators of rockfall fragmentation and implications for mobility Field evidence and indicators of rockfall fragmentation and implications for mobility

Rockfall fragmentation can play an important role in hazard studies and the design of protective measures. However, the current lack of modeling tools that incorporate rock fragmentation mechanics is a limitation to enhancing studies and design. This research investigates the fragmentation patterns of rockfalls and analyzes the resulting distribution of fragment sizes within...
Authors
Camilla Lanfranconi, Paolo Frattini, Federico Agliardi, Greg M. Stock, Brian D. Collins, Giovanni Crosta

Incorporating climate change into restoration decisions: Perspectives from dam removal practitioners Incorporating climate change into restoration decisions: Perspectives from dam removal practitioners

Incorporating climate change into conservation and restoration decisions is increasingly important for natural resource managers and restoration practitioners to effectively address the underlying drivers of ecosystem change. Small dam removal is an example of a restoration tool that may offer multiple socioeconomic and ecological benefits in streams, including promoting climate...
Authors
Katherine M. Abbott, Allison H. Roy, Francis J. Magilligan, Keith H. Nislow, Rebecca Quiñones

Recognition of artificial gases formed during drill-bit metamorphism using advanced mud gas Recognition of artificial gases formed during drill-bit metamorphism using advanced mud gas

Drill-bit metamorphism (DBM) is the process of thermal degradation of drilling fluid at the interface of the bit and rock due to the overheating of the bit. The heat generated by the drill when drilling into a rock formation promotes the generation of artificial hydrocarbon and non-hydrocarbon gas, changing the composition of the gas. The objective of this work is to recognize and...
Authors
Janaina A. de Lima Leon, Henrique Luiz de Barros Penteado, Geoffrey S. Ellis, Alexei V. Milkov, João Graciano Mendonça Filho

Insights on gas hydrate formation and growth within an interbedded sand reservoir from well logging at the Qiongdongnan Basin, South China Sea Insights on gas hydrate formation and growth within an interbedded sand reservoir from well logging at the Qiongdongnan Basin, South China Sea

Although variable well log resolution and its control on saturation estimation has been studied, it has not been directly applied to a specific location to explore the nature of gas hydrate within a sand reservoir. We applied in-situ measurements of resistivities, neutron porosity, and gamma ray at two sites in the Qiongdongnan Basin, South China Sea (QDN-W05–2021 and QDN-W08–2021) to...
Authors
Dongju Kang, Zijian Zhang, Jing’an Lu, Stephen C. Phillips, Jinqiang Liang, Wei Deng, Chao Zhong, Dajiang Meng
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