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Fall Semester Classes Begin
Start:August 25, 2021 at 8:00 am
End:
August 25, 2021 at 5:00 pm
UTIG Seminar Series: Bhargav Boddupalli, UTIG
Start:August 27, 2021 at 10:30 am
End:
August 27, 2021 at 11:30 am
Location:
Zoom Meeting
Contact:
Constantino Panagopulos, costa@ig.utexas.edu, 512-574-7376
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Speaker: Bhargav Boddupalli, Postdoctoral Fellow, UTIG
Host: Shuoshuo Han
Title: Imaging of the Deep Galicia margin using ocean bottom seismic data
Abstract: Continental rifting and breakup is the first order tectonic process that initiates the plate tectonic cycle and results in the formation of passive rifted margins. The Galicia margin, west of Iberia, is archetypical for magma-poor rifted margins where a number of key concepts of rifting processes have been developed and tested. Seismic imaging has been instrumental in understanding rifting in the Galicia margin. In this talk, I present a high-resolution P-wave velocity model of the Deep Galicia margin (DGM) where the final breakup of the continental crust happened. The velocity model is derived employing a 3D acoustic full waveform inversion (FWI) technique in the time domain using sparsely acquired wide-angle ocean bottom seismometer (OBS) data. Comparison of the 3D FWI model result with 2D result derived along a profile through the 3D seismic volume highlighted the differences between the imaging methods in a real world setting. Differences in the data residuals of the 2-D, 2.5-D and 3-D inversions suggest that 2-D inversion can be prone to overfitting when using a sparse data set. Using the 3D FWI velocity model of hyper-thinned crust at the Deep Galicia Margin (DGM), we constrain the nature of the crust at this margin by comparing its velocity structure with those in other similar tectonic settings. Our velocity model also shows evidence for exhumation of the lower crust under the footwalls of fault blocks to accommodate the extension. We used our model to generate a serpentinization map for the uppermost mantle at the DGM, at a depth of 100 ms (~340m) below the S-reflector, a low-angle detachment that marks the base of the crust at this margin. Based on this map, we propose that serpentinization began during rifting and continued into a post-rift phase until the faults were sealed. We find a poor correlation between the fault heaves and the degree of serpentinization beneath the hanging- and foot-wall blocks, indicating that serpentinization was controlled by a complex mechanism during and after rifting. A good match between topographic highs of S and local highly serpentinized areas of mantle suggests that the serpentinization process resulted in variable uplift of the S-surface.
First-order multiples from the OBS data can be used to develop seismic images using a technique called mirror imaging. We developed seismic images of the DGM in time and depth domains using mirror imaging. In this technique, the seafloor along with the OBS is mirror imaged with respect to the sea-surface and placed at a depth of twice the water column depth. Such an adjustment allows incorporation of the multiples in to migration algorithms just like primary reflections. Mirror imaging can become a standard processing step in studies where no multichannel data are available.
Soft Rock Seminar: Zach Sickmann
Start:August 30, 2021 at 12:00 pm
End:
August 30, 2021 at 1:00 pm
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Accelerating sand mining for Bangladesh development threatens the sand chars of the Ganges
Dr. Zach Sickmann (UTIG)
Monday, August 30th 12-1 pm
Zoom link: https://utexas.zoom.us/j/94967658238
UTIG Discussion Hour: Gail Christeson, UTIG
Start:August 31, 2021 at 2:00 pm
End:
August 31, 2021 at 3:00 pm
Location:
Zoom Meeting
Contact:
Naoma McCall, nmccall@utexas.edu
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Speaker: Gail Christeson, Senior Research Scientist / Associate Director, UTIG
Title: South Atlantic Transect Project: Pre-Expedition Drilling during Covid-19 Pandemic
Planetary Habitability Seminar SeriesApril, 22 2024Time: 1:00 PM - 2:00 PMLocation: PMA 15.216B UT Center for Planetary Systems Habitability Seminar Series. See website for speaker schedule and more details: View Events Join remotely: https://utexas.zoom.us/j/94052130734 In person: Classroom 15.216B, Physics, Math and Astronomy Bldg. UT Austin, Department of Astronomy 2515 Speedway, Stop C1400 Austin, Texas 78712-1205 |
UTIG Discussion Hour: Nicholas Montiel - PhD Talk (UTIG)April, 23 2024Time: 2:00 PM - 3:00 PMLocation: ROC 2.201 |
UTIG Seminar Series: Cornelia Rasmussen, UTIGApril, 26 2024Time: 10:30 AM - 11:30 AMLocation: PRC 196/ROC 1.603 Speaker: Cornelia Rasmussen, Research Associate, University of Texas Institute for Geophysics Host: Krista Soderlund Title: The Emerging Field Of Position-Specific Isotope Analysis: Applications in chemical forensics, exobiology, geo- and environmental sciences Abstract: Complex organics can be found all over our solar system and within each living thing on our planet, be it as part of its physiology or as a contaminant. However, different processes can lead to the formation of chemical identical molecules. This makes answering a number of scientific questions challenging. One example is distinguishing between biotic and abiotic molecules, hence hindering life detection on early Earth but especially on other planetary bodies, such as on Mars, Titan, Enceladus and on meteorites where organics have been detected. Moreover, tracing molecules as they move through the environment can be demanding, yet is essential in studying the flow of organic molecules as well as correlating pollutants with their source. Novel tools to address these challenges are currently being developed. Especially, the emerging field of position-specific isotope analysis is beginning to grant access to the unique intramolecular carbon (13C/12C) isotope fingerprint preserved in complex molecules. This fingerprint can be applied in various scientific disciplines, ranging from forensics to exobiology, geo- and environmental sciences, including geo health. Nuclear magnetic resonance spectroscopy (NMR) has the potential to become a key player in this research area, as it allows the analysis of organics within complex mixtures, all without the need to fragment the molecule into single carbon units or the combustion of the molecule of interest. We have been developing several NMR tools that allow us to investigate the intramolecular carbon isotope distribution within various molecule classes and to test the central hypothesis that the position-specific carbon isotope distribution within complex organics depends on a molecule’s source and formation history. |
Planetary Habitability Seminar SeriesApril, 29 2024Time: 1:00 PM - 2:00 PMLocation: PMA 15.216B UT Center for Planetary Systems Habitability Seminar Series. See website for speaker schedule and more details: View Events Join remotely: https://utexas.zoom.us/j/94052130734 In person: Classroom 15.216B, Physics, Math and Astronomy Bldg. UT Austin, Department of Astronomy 2515 Speedway, Stop C1400 Austin, Texas 78712-1205 |
UTIG Discussion Hour: Kristian Chan - PhD Talk (UTIG)April, 30 2024Time: 2:00 PM - 3:00 PMLocation: ROC 2.201 |