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Filter Total Items: 1420
Nucleation speed limit on remote fluid induced earthquakes Nucleation speed limit on remote fluid induced earthquakes
Earthquakes triggered by other remote seismic events are explained as a response to long-traveling seismic waves that temporarily stress the crust. However, delays of hours or days after seismic waves pass through are reported by several studies, which are difficult to reconcile with the transient stresses imparted by seismic waves. We show that these delays are proportional to magnitude...
Authors
Thomas E. Parsons, Aybige Akinci, Luca Malignini
Seasonal variability in particulate matter source and composition to the depositional zone of Baltimore Canyon, U.S. Mid-Atlantic Bight Seasonal variability in particulate matter source and composition to the depositional zone of Baltimore Canyon, U.S. Mid-Atlantic Bight
Submarine canyons are often hotspots of biomass and productivity in the deep sea. However, the majority of deep-sea canyons remain poorly sampled. Using a multi-tracer approach, results from a detailed geochemical investigation from a year-long sediment trap deployment reveals details concerning the source, transport, and fate of particulate matter to the depositional zone (1318 m) of...
Authors
Nancy G. Prouty, Furu Mienis, P. Campbell, E. Brendan Roark, Andrew Davies, Craig M. Robertson, Gerard Duineveld, Steve W. Ross, M. Rhodes, Amanda W.J. Demopoulos
Fishing activities Fishing activities
Unlike the major anthropogenic changes that terrestrial and coastal habitats underwent during the last centuries such as deforestation, river engineering, agricultural practices or urbanism, those occurring underwater are veiled from our eyes and have continued nearly unnoticed. Only recent advances in remote sensing and deep marine sampling technologies have revealed the extent and...
Authors
Ferdinand K. J. Oberle, Pere Puig, Jacobo Martin
The transtensional offshore portion of the northern San Andreas fault: Fault zone geometry, late Pleistocene to Holocene sediment deposition, shallow deformation patterns, and asymmetric basin growth The transtensional offshore portion of the northern San Andreas fault: Fault zone geometry, late Pleistocene to Holocene sediment deposition, shallow deformation patterns, and asymmetric basin growth
We mapped an ~120 km offshore portion of the northern San Andreas fault (SAF) between Point Arena and Point Delgada using closely spaced seismic reflection profiles (1605 km), high-resolution multibeam bathymetry (~1600 km2), and marine magnetic data. This new data set documents SAF location and continuity, associated tectonic geomorphology, shallow stratigraphy, and deformation...
Authors
Jeffrey W. Beeson, Samuel Y. Johnson, Chris Goldfinger
Dam removal: Listening in Dam removal: Listening in
Dam removal is widely used as an approach for river restoration in the United States. The increase in dam removals—particularly large dams—and associated dam-removal studies over the last few decades motivated a working group at the USGS John Wesley Powell Center for Analysis and Synthesis to review and synthesize available studies of dam removals and their findings. Based on dam...
Authors
Melissa M. Foley, James Bellmore, James E. O'Connor, Jeffrey J. Duda, Amy E. East, Gordon G. Grant, Chauncey W. Anderson, Jennifer A. Bountry, Mathias J. Collins, Patrick J. Connolly, Laura S. Craig, James E. Evans, Samantha Greene, Francis J. Magilligan, Christopher S. Magirl, Jon J. Major, George R. Pess, Timothy J. Randle, Patrick B. Shafroth, Christian E. Torgersen, Desiree D. Tullos, Andrew C. Wilcox
By
Ecosystems Mission Area, Natural Hazards Mission Area, Water Resources Mission Area, Volcano Hazards Program, Forest and Rangeland Ecosystem Science Center, John Wesley Powell Center for Analysis and Synthesis, Oregon Water Science Center, Pacific Coastal and Marine Science Center, Volcano Science Center, Western Fisheries Research Center, Columbia River Research Laboratory (CRRL)
Investigation of late Pleistocene and Holocene activity in the San Gregorio fault zone on the continental slope north of Monterey Canyon, offshore central California Investigation of late Pleistocene and Holocene activity in the San Gregorio fault zone on the continental slope north of Monterey Canyon, offshore central California
We provide an extensive high‐resolution geophysical, sediment core, and radiocarbon dataset to address late Pleistocene and Holocene fault activity of the San Gregorio fault zone (SGFZ), offshore central California. The SGFZ occurs primarily offshore in the San Andreas fault system and has been accommodating dextral strike‐slip motion between the Pacific and North American plates since...
Authors
Katherine L. Maier, Charles K. Paull, Daniel S. Brothers, David W. Caress, Mary McGann, Eve M. Lundsten, Krystle Anderson, Roberto Gwiazda
Introduction to “Global tsunami science: Past and future, Volume II” Introduction to “Global tsunami science: Past and future, Volume II”
Twenty-two papers on the study of tsunamis are included in Volume II of the PAGEOPH topical issue “Global Tsunami Science: Past and Future”. Volume I of this topical issue was published as PAGEOPH, vol. 173, No. 12, 2016 (Eds., E. L. Geist, H. M. Fritz, A. B. Rabinovich, and Y. Tanioka). Three papers in Volume II focus on details of the 2011 and 2016 tsunami-generating earthquakes...
Authors
Alexander B. Rabinovich, Hermann M. Fritz, Yuichiro Tanioka, Eric L. Geist
The use of passive membrane samplers to assess organic contaminant inputs at five coastal sites in west Maui, Hawaii The use of passive membrane samplers to assess organic contaminant inputs at five coastal sites in west Maui, Hawaii
Five passive membrane samplers were deployed for 28 continuous days at select sites along and near the west Maui coastline to assess organic compounds and contaminant inputs to diverse, shallow coral reef ecosystems. Daily and weekly fluctuations in such inputs were captured on the membranes using integrative sampling. The distribution of organic compounds observed at these five coastal...
Authors
Pamela L. Campbell, Nancy G. Prouty, Curt D. Storlazzi, Nicole D’antonio
Landscape context and the biophysical response of rivers to dam removal in the United States Landscape context and the biophysical response of rivers to dam removal in the United States
Dams have been a fundamental part of the U.S. national agenda over the past two hundred years. Recently, however, dam removal has emerged as a strategy for addressing aging, obsolete infrastructure and more than 1,100 dams have been removed since the 1970s. However, only 130 of these removals had any ecological or geomorphic assessments, and fewer than half of those included before- and...
Authors
Melissa M. Foley, Francis J. Magilligan, Christian E. Torgersen, Jon J. Major, Chauncey W. Anderson, Patrick J. Connolly, Daniel J. Wieferich, Patrick B. Shafroth, James E. Evans, Dana M. Infante, Laura Craig
By
Ecosystems Mission Area, Water Resources Mission Area, Science Synthesis, Analysis, and Research Program, Science Analytics and Synthesis (SAS) Program, Forest and Rangeland Ecosystem Science Center, John Wesley Powell Center for Analysis and Synthesis, Oregon Water Science Center, Pacific Coastal and Marine Science Center
The application of microtextural and heavy mineral analysis to discriminate between storm and tsunami deposits The application of microtextural and heavy mineral analysis to discriminate between storm and tsunami deposits
Recent work has applied microtextural and heavy mineral analyses to sandy storm and tsunami deposits from Portugal, Scotland, Indonesia and the USA. We looked at the interpretation of microtextural imagery (scanning electron microscopy) of quartz grains and heavy mineral compositions. We consider inundation events of different chronologies and sources (the AD 1755 Lisbon and 2004 Indian...
Authors
Pedro J.M. Costa, Guy R. Gelfenbaum, Sue Dawson, SeanPaul La Selle, F Milne, J. Cascalho, C. Ponte Lira, C. Andrade, M. C. Freitas, Bruce E. Jaffe
Coastal habitat and biological community response to dam removal on the Elwha River Coastal habitat and biological community response to dam removal on the Elwha River
Habitat diversity and heterogeneity play a fundamental role in structuring ecological communities. Dam emplacement and removal can fundamentally alter habitat characteristics, which in turn can affect associated biological communities. Beginning in the early 1900s, the Elwha and Glines Canyon dams in Washington, USA, withheld an estimated 30 million tonnes of sediment from river, coastal...
Authors
Melissa M. Foley, Jonathan A. Warrick, Andrew C. Ritchie, Andrew W. Stevens, Patrick B. Shafroth, Jeffrey J. Duda, Matthew M. Beirne, Rebecca Paradis, Guy R. Gelfenbaum, Randall McCoy, Erin S. Cubley
Baseline assessments for coral reef community structure and demographics on West Maui Baseline assessments for coral reef community structure and demographics on West Maui
The coastal and upslope terrains of West Maui have had a long history of impacts owing to more than a century of human activities. Resource extraction, agriculture, as well as residential and resort development have caused land-based pollution that impairs water quality and adversely impact the adjacent marine ecosystem. Today, West Maui’s coral reefs are chronically impacted by the...
Authors
Bernardo Vargas-Angel, Darla White, Curt D. Storlazzi, Tova Callender, Paulo Maurin