Publications
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An economic evaluation of adaptation pathways in coastal mega cities: An illustration for Los Angeles
Sea level rise and uncertainty in its projections pose a major challenge to flood risk management and adaptation investments in coastal mega cities. This study presents a comparative economic evaluation method for flood adaptation measures, which couples a cost–benefit analysis with the concept of adaptation pathways. Our approach accounts for uncertainty in sea level rise projections by allowing
Authors
Lars T. de Ruig, Patrick L. Barnard, W. J. Wouter Botzen, Phyllis Grifman, Juliette Finzi Hart, Hans de Moel, Nick Sadrpour, Jeroen C.J.H. Aerts
Wildfire as a catalyst for hydrologic and geomorphic change
Wildfire has been a constant presence on the Earth since at least the Silurian period, and is a landscape-scale catalyst that results in a step-change perturbation for hydrologic systems, which ripples across burned terrain, shaping the geomorphic legacy of watersheds. Specifically, wildfire alters two key landscape properties: (1) overland flow, and (2) soil erodibility. Overland flow and soil er
Authors
Francis K. Rengers
Rate of magma supply beneath Mammoth Mountain, California based on helium isotopes and CO2 emissions
Mammoth Mountain, California, has exhibited unrest over the past ~30 years, characterized by seismicity over a broad range of depths, elevated 3He/4He ratios in fumarolic gas, and large-scale diffuse CO2 emissions. This activity has been attributed to magmatic intrusion, but minimal ground deformation and the presence of a shallow crustal gas reservoir beneath Mammoth Mountain pose a challenge for
Authors
Jennifer L. Lewicki, William C. Evans, Emily Montgomery-Brown, Margaret T. Mangan, John King, Andrew Hunt
Fault slip associated with the 2 September 2017 M 5.3 Sulphur Peak, Idaho, earthquake and aftershock sequence
The 2 September 2017 M 5.3 Sulphur Peak, Idaho, earthquake is one of the largest earthquakes in southern Idaho since the 1983 M 6.9 Borah Peak earthquake. It was followed by a vigorous aftershock sequence for nearly two weeks that included five events above M 4.5. The coseismic and early postseismic deformation was measured with both Interferometric Synthetic Aperture Radar and Global Positioning
Authors
Fred Pollitz, Charles Wicks, William L. Yeck, James E. Evans
Role of tidal wetland stability in lateral fluxes of particulate organic matter and carbon
Tidal wetland fluxes of particulate organic matter and carbon (POM, POC) are important terms in global budgets but remain poorly constrained. Given the link between sediment fluxes and wetland stability, POM and POC fluxes should also be related to stability. We measured POM and POC fluxes in eight microtidal salt marsh channels, with net POM fluxes ranging between −121 ± 33 (export) and 102 ± 28
Authors
Neil Kamal Ganju, Zafer Defne, Tracy Elsey Quirk, Julia M. Moriarty
Shallow structure and geomorphology along the offshore northern San Andreas Fault, Tomales Point to Fort Ross, California
We mapped a poorly documented 35-km-long section of the northern San Andreas fault zone (NSAF) between Tomales Point and Fort Ross, California. Mapping is largely based on high-resolution seismic-reflection profiles (38 fault crossings), multibeam bathymetry, and onshore geology. NSAF strike in this section is nearly parallel to plate motion, characterized by a slight (~2°) northerly (transtension
Authors
Samuel Johnson, Beeson Jeffrey W.
Analysis and visualization of coastal ocean model data in the cloud
The traditional flow of coastal ocean model data is from High Performance Computing (HPC) centers to the local desktop, or to a file server where just the data needed can be extracted via services such as OPeNDAP. Analysis and visualization is then conducted using local hardware and software. This requires moving large amounts of data across the internet as well as acquiring and maintaining local
Authors
Richard P. Signell, Dharhas Pothina
Submarine permafrost map in the arctic modelled using 1D transient heat flux (SuPerMAP)
Offshore permafrost plays a role in the global climate system, but observations of permafrost thickness, state, and composition are limited to specific regions. The current global permafrost map shows potential offshore permafrost distribution based on bathymetry and global sea level rise. As a first‐order estimate, we employ a heat transfer model to calculate the subsurface temperature field. Our
Authors
P.P. Overduin, T. Schneider, F. Miesner, M.N. Grigoriev, Carolyn D. Ruppel, A. Vasiliev, H. Lantuit, B. Juhls, S. Westermann
Ground-motion attenuation in the Sacramento-San Joaquin delta, California, from 14 Bay Area earthquakes, including the 2014 M 6.0 South Napa earthquake
Peak ground motions (acceleration and velocity) radiated by earthquakes in the San Francisco Bay area and recorded within the Sacramento–San Joaquin Delta generally attenuate faster with distance than the Next Generation Attenuation-West2 ground-motion prediction equations (GMPEs). We evaluate the attenuation for a wide set of paths into the Delta by analyzing recorded ground motions from fourteen
Authors
Jemile Erdem, Jack Boatwright, Jon Peter B. Fletcher
Peak ground displacement saturates exactly when expected: Implications for earthquake early warning
The scaling of rupture properties with magnitude is of critical importance to earthquake early warning (EEW) systems that rely on source characterization using limited snapshots of waveform data. ShakeAlert, a prototype EEW system that is being developed for the western United States, provides real-time estimates of earthquake magnitude based on P-wave peak ground displacements measured at station
Authors
Daniel T. Trugman, Morgan T. Page, Sarah E. Minson, Elizabeth S. Cochran
Exotic Seismic Events Catalog (ESEC) Data Product
Nonearthquake seismic events from sources such as landslides, debris flows, dam collapses, floods, glaciers, and avalanches are rarely included in traditional earthquake catalogs. The new Incorporated Research Institutions for Seismology (IRIS) Data Management Center Exotic Seismic Events Catalog data product provides information on such events to help accelerate research in the area of environmen
Authors
Manoch Bahavar, Kate E. Allstadt, Mick Van Fossen, Stephen Malone, Chad Trabant
Iron and sulfide nanoparticle formation and transport in nascent hydrothermal vent plumes
Deep-sea hydrothermal vents are a significant source of dissolved metals to the global oceans, producing midwater plumes enriched in metals that are transported thousands of kilometers from the vent source. Extensive particle precipitation upon emission of hydrothermal fluids, due to temperature and pH changes during mixing with ambient seawater, controls metal speciation and the magnitude of meta
Authors
Alyssa J. Findlay, Emily Estes, Amy Gartman, Alexey Kamyshny, Mustafa Yucel, George W. Luther