Events
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De Ford Lecture Series: Jim Van Orman, Case Western University
Start:December 3, 2015 at 3:30 pm
End:
December 3, 2015 at 5:00 pm
Location:
Boyd Auditorium
Contact:
Patrick Stafford, 5124715172
UTIG Seminar Series: GRA Presenter, Maureen Walton
Start:December 4, 2015 at 10:30 am
End:
December 4, 2015 at 11:30 am
Location:
PRC, 10100 Burnet Road, Bldg 196, Rm 1.603, Austin, TX 78758
Contact:
Nick Hayman, hayman@ig.utexas.edu, 512-471-7721
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Presentation title: “Revisiting the 1899 Earthquakes of Yakutat Bay, Alaska”
Abstract:
North of Yakutat Bay in southeastern Alaska, the subducting Yakutat Block intersects with the Fairweather transform fault system. A series of large earthquakes occurred in the region in September of 1899, including a Mw 8.2 event on 10 September that resulted in >14 m of coseismic uplift and a 6 m tsunami in Yakutat Bay. Despite recurrence risk of the 1899 or similar events in the region, the fault(s) that ruptured in 1899 remain unidentified. Previous efforts to map active Yakutat Bay faults carried out by Plafker and Thatcher (2008) used post-1899 bedrock uplift measurements to infer the location of potentially important structures, including the Esker Creek and Bancas Point thrusts. As measurement error was not assessed in their study, we revisit the uplift measurements by quantifying uncertainty; effects of glacial isostatic adjustment (GIA), in particular, are significant. We also combine new seismic reflection data with existing topography, bathymetry, GPS, and satellite photo data to update earlier fault maps. Our reevaluation of uplift measurements suggests that primary slip and uplift during the 10 September earthquake was limited to northwest of Yakutat Bay. Additionally, a high-resolution seismic reflection survey we conducted in Yakutat Bay during August 2012 constrains faulting to on- or near-shore based on the absence of bay-crossing faults. Collectively, our results imply that predominantly strike-slip and transpressive horsetail-type faults are southeast of Yakutat Bay, with compressional structures related to Yakutat Block subduction/collision to the northwest. We interpret the 10 September 1899 event to be the result of complex rupture somewhere within the Yakutat subduction/collision system. Based on our updated map of coseismic uplift and fault structure, we favor a rupture model where primary slip occurred along the Esker Creek system locally with possible induced coseismic slip along the neighboring Boundary transpressive fault system. Future work targets imaging offshore connections between Yakutat Bay fault systems and the Pamplona Zone subduction deformation front, which will assist with assessing potential hazards related to recurrence of an 1899-type event.
UTIG Seminar: Frédérique Leclerc, Earth Observatory of Singapore
Start:December 11, 2015 at 10:30 am
End:
December 11, 2015 at 11:30 am
Location:
PRC, 10100 Burnet Road, Bldg 196, Rm 1.603, Austin, TX 78758
Contact:
Fred Taylor, fred@ig.utexas.edu, 512-471-0453
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“Long-Term Permanent Deformation of Overriding Plates: Markers to Better Understand Convergence Accommodation and the Seismic Behavior of Subduction Zones”
Abstract:
Where convergence is slow and seismicity rate is low, convergent margins’ seismic hazard is usually not well understood, due to poor constraints on the way convergence is accommodated. In such cases, geodesic measurements often fail to characterize the megathrust’s seismic behavior. Therefore, long-term upper-plate deformation constitutes valuable information that reveals how the convergence is accommodated and what processes are taking place along the active margin.
The slow and apparently uncoupled Lesser Antilles (L.A.) subduction zone and the SE Indonesian arc-continent collision margin are such plate boundaries – relatively seismically quiet during the historical period, and where first-order questions are still unresolved: how is the convergence accommodated? What processes is taking place along the margin? What and where are the active tectonic structures? What are their geometry and kinematics?
Both margins are located at latitudes where reefs are growing and record long-term vertical coastal movements. By studying the stratigraphy and morphology of emerged but also submerged reef complexes, through marine geophysical data and field investigation, as well as by modeling the reef deposition, we can determine the vertical movements of the coasts over several 100 kyr. Both along- and across a trench, the geometry and kinematics of upper-plate deformation allow us to determine and interpret active structures and megathrust-related processes that accommodate the convergence. In the L.A., we will further compare the long-term deformation to the short-term (seismic cycle related) deformation to question our present understanding of the seismic behavior of the subduction zone.
Alumni Reception during AGU in San Francisco
Start:December 16, 2015 at 12:00 pm
End:
December 16, 2015 at 2:00 pm
Location:
ThirstyBear Brewing Co. - 661 Howard Street in San Francisco
Contact:
Kristen Tucek, ktucek@jsg.utexas.edu, 512-471-2223
DeFord Lecture | Dr. Richard TaylorApril, 25 2024Time: 4:00 PM - 5:00 PMLocation: Boyd Auditorium (JGB 2.324) Adapting to the Amplification of Climate Extremes Through Freshwater Capture: Evidence from the Tropics by Dr. Richard Taylor, Department of Geography, University College London Abstract: In low-income countries of the tropics undergoing rapid growth, global warming presents challenges to the expansion and sustainability of water supplies required to advance progress toward the United Nations’ Sustainable Development Goals. Substantial uncertainty persists in projections of precipitation under climate change. A widely observed impact, pronounced in the tropics, is the intensification of precipitation comprising a transition towards fewer but heavier rainfalls. How does this transition impact terrestrial water balances? How might these changes influence freshwater demand? I will interrogate these questions and review mounting empirical evidence from the tropics of the resilience to climate change of groundwater resources, which act as a natural inter-annual store of freshwater supporting adaptation to the amplification climate extremes. Presented evidence includes case studies and local-to-regional scale analyses from tropical Africa and the Bengal Basin of South Asia. Outcomes emphasize the interconnected nature of surface water and groundwater as well as the value of groundwater as a natural, distributed store of freshwater. This insight provides a platform to explore more equitable and sustainable water development pathways resilient to climate change. |
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 |