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January 2020

Geophysics and the Shale Revolution: The Anisotropy Connection

January 17 @ 10:30 am - 12:00 pm

Leon Thomsen University of Houston Delta Geophysics What to Expect This is a critical time in the history of the profession of exploration geophysics. Today the world is awash with copious supplies of oil, and so the price of oil is low, and hence many geophysical jobs have disappeared. For most of the past 40 years, the world feared the imminent exhaustion of its endowment of oil, but, in the last decade vast new deposits of oil have indeed been…

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January 2020

Data Challenges in Analyzing Fault Slip Rates, Determining Drilling Targets for Gold Exploration and Understanding Lithospheric Subsidence in Antarctica

January 17 @ 9:00 am - 10:00 pm

Dr. Sumant Jha What to Expect Data is the backbone of any analysis. From using NASA’s space radar topographic mission data for analyzing landslide hazards to using data collected from scientific ships around Antarctica to determine the shape of the seafloor over the past 5 million years, I have used data in different formats to address different scientific questions. Geoscientific analysis invariably involves reading a given set of geologic/geophysical data to devise solutions for a particular problem. These data consist…

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January 2020

Climate Brown Bag: Scaling Plant Physiology from the Leaf to Space

January 13 @ 12:00 pm - 1:00 pm

Troy Sehlin Magney What to Expect To characterize CO2 uptake by the terrestrial biosphere, an understanding of the spatial and temporal dynamics of photosynthesis is necessary. From remote sensing platforms, we have traditionally only been able to estimate plant photosynthesis based on canopy ‘greenness.’ Unfortunately, canopy ‘greenness’ doesn’t tell us about the fate of absorbed photons, i.e. just because a plant is green does not mean it is doing photosynthesis. Absorbed light by green plants generally has three fates: 1)…

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December 2019

Distributed Acoustic Sensing for Seismic Imaging and Reservoir Monitoring Applied to Carbon Capture and Storage Projects

December 19, 2019 @ 10:00 am - 11:00 pm

Julia Correa What to Expect In carbon geosequestration projects, there is an essential need for effective monitoring of the carbon dioxide storage over decades to ensure safe containment of the CO2 plume in the reservoir. However, current seismic monitoring techniques usually involve a combination of various seismic surveys acquired using a large array of seismic receivers and moveable sources to image the emplaced gas plume. The complexity of such surveys results in expensive operations that are, at times, unviable for carbon…

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December 2019

Underground Experiments and Picoseismicity: Understanding Rock Response by Studying Tiny Seismic Events

December 18, 2019 @ 11:00 am - 12:00 pm
Katrin Plekers

Dr. Katrin Plenkers What to Expect Picoseismicity allows to study the rock response in great detail, which is of importance in may large-scale experiments in underground laboratories addressing questions like earthquake nucleation, hydro-fracturing or nuclear waste disposal. Furthermore, picoseismi monitoring is used for structural health monitoring e.g. in mines. Picoseismicity corresponds to seismic events representing fractures on mm-, cm or dm scale (Magnitudes approx. -6 < M < 0). Seismic signals with frequencies from ~ 1000 Hz to ~150.000 Hz are…

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December 2019

Seismic Full Waveform Inversion and Monitoring for Borehole Datasets

December 17, 2019 @ 2:00 pm - 3:00 pm

Rie Nakata (Kamei) What to Expect Advances in acquisition systems and computational resources are bringing us to a new era of seismic imaging, inversion and monitoring. We are now able to utilize seismic records more comprehensively, and hence able to extract more detailed subsurface information. Seismic full waveform inversion (FWI) is one of such advanced methods that estimates a spatial distribution of subsurface elastic properties (velocity, attenuation, and anisotropy) of the Earth at an unprecedented level of resolution by fitting seismic waveforms based on the numerical solution of the wave equation. Seismic…

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December 2019

Fluctuation of the Wintertime Arctic Oscillation Pattern

December 16, 2019 @ 12:00 pm - 1:00 pm

Lin Wang What to Expect The Arctic Oscillation (AO) is the leading mode of climate variability in the Northern Hemisphere winter. It is generally regarded as a zonally-symmetric pattern with one center over Pacific and two centers over the North Atlantic and North Pacific. Based on observational and reanalysis datasets with long records, the multidecadal fluctuations in the patterns and teleconnections of the winter mean AO are investigated. Results show that the Atlantic center of the AO pattern remains unchanged…

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December 2019

A New Transient Electromagnetic System Capable of Mapping the Subsurface in Full 3D

December 6, 2019 @ 3:30 pm - 4:30 pm

Esben Auken What to Expect New electronics and faster computers are creating exiting opportunities for developing new EM instruments with hitherto unseen capabilities for resolving subsurface geological structures with a very high resolution. With an offset in airborne electromagnetic, more specifically the SkyTEM system, we have developed a small coil compact system called tTEM. Where SkyTEM is a large moment system capable of resolving the geology to a depth of up to 500 m, tTEM is focused on the top…

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December 2019

Causes of Variability and Trends in Earth’s Radiation Budget over the 21st Century

December 6, 2019 @ 12:00 pm - 1:00 pm

Shiv Priyam Raghuraman What to Expect The latest satellite observations show significant interannual and interdecadal anomalies in the global radiation budget during 2000-2018. Changes in the reflection of solar radiation and emission of thermal radiation perturb Earth’s energy balance and play a crucial role in the climate system, yet these changes’ key controls are poorly comprehended. In this presentation, we will breakdown the causes for variability and trends in two important elements of Earth’s energy budget: the clear sky greenhouse…

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December 2019

DSSS: Soil Mineral Surfaces and Organic Matter Sequestration

December 6, 2019 @ 10:30 am - 12:00 pm

Ingrid Kögel-Knabner What to Expect Soil is built of a dynamic and hierarchically organized system of various organic and inorganic constituents and organisms, the spatial structure of which defines a large, complex and heterogeneous biogeochemical interface. Recent evidence shows a zonation of fine soil particle surfaces into key sites with high OM sequestration in stacked OM patches decoupled from the mineral surface area, rather than a monolayer surface coverage. We explain why soils, even if they contain less fine minerals…

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