A5073693972- Methane Hydrates and Related Phenomena
- earthquake and tectonic studies
- Geological Studies and Exploration
- Geological and Geochemical Analysis
- Seismic Imaging and Inversion Techniques
- Geology and Paleoclimatology Research
- Seismic Waves and Analysis
- Seismology and Earthquake Studies
- High-pressure geophysics and materials
- Geological and Geophysical Studies
- Hydrocarbon exploration and reservoir analysis
- Geochemistry and Geologic Mapping
- Geological Modeling and Analysis
- Geological formations and processes
- Cryospheric studies and observations
- Reservoir Engineering and Simulation Methods
- Geophysical Methods and Applications
- Earthquake Detection and Analysis
- Atmospheric and Environmental Gas Dynamics
- Climate change and permafrost
- Geotechnical and Geomechanical Engineering
- Drilling and Well Engineering
- Geophysics and Sensor Technology
- Geological and Tectonic Studies in Latin America
- Marine and environmental studies
University of New Mexico
2015-2025
John Wiley & Sons (United States)
2016
Texas A&M University
2011-2013
The University of Texas at Austin
2010-2012
We present a two‐dimensional velocity model to constrain crustal thickness and composition of the Yakutat terrane in northern Gulf Alaska. The was constructed using seismic reflection refraction data along ∼455 km onshore‐offshore profile. Our shows that crystalline crust composing is wedge‐shaped, with increasing west east from ∼15 ∼30 km. Crustal structure are continuous across terrane, lower velocities >7 km/s, suggesting an oceanic plateau its entire offshore extent rather than...
We present new constraints on the crustal structure of Yakutat terrane and evidence role Transition fault in southern Alaska. The south Bay includes crystalline crust that is 24–27 km thick overlain by sedimentary units are 4.5–7.5 thick. thickness velocity consistent with an oceanic plateau origin. edge bounded fault, which imaged as a near-vertical zone ∼1 wide. coincident dramatic change Moho depth from 32 for to 11.5 Pacific Ocean occurring over horizontal distance 0–5 km. There no...
Significance In coastal Alaska and the St. Elias orogen, over past 1.2 million years, mass flux leaving mountains due to glacial erosion exceeds plate tectonic input. This finding underscores power of climate in driving rates, potential feedback mechanisms linking climate, erosion, tectonics, complex nature climate−tectonic coupling transient responses toward longer-term dynamic equilibration landscapes with ever-changing environments.
Abstract Mantle shear velocity (Vs) structure beneath the Transportable Array (TA) in Alaska and northwestern Canada is imaged by joint inversion of Rayleigh wave dispersion teleseismic S travel times. The study connects previously unsampled parts northern western with portions southern earlier seismic arrays. new Vs tomography shows contrasting lithospheric plate interior lower shallow upper mantle indicative thinner thermal lithosphere south Brooks Range along transform margin. Higher down...
Previous studies in the Yakataga fold-thrust belt of St. Elias orogen southern Alaska have demonstrated high exhumation rates associated with alpine glaciation; however, these were conducted only a rudimentary treatment actual structures responsible for deformation that produced long-term uplift. We present results detailed geologic mapping two corridors across onshore system: Duktoth River transect just west Cape and Icy Bay Mount region. In transect, we recognize older, approximately...
Abstract The crustal structure of north‐central Wyoming records a history complex lithospheric evolution from Precambrian accretion to Cretaceous‐Paleogene Laramide shortening. We present two active source P wave velocity model profiles collected as part the Bighorn Arch Seismic Experiment in 2010. Analyses these models and single‐fold reflection data, together with potential field modeling regional gravity magnetic signals, constrain thickness region. image west dipping boundary sharp...
Abstract The Alaska Amphibious Community Seismic Experiment (AACSE) is a shoreline-crossing passive- and active-source seismic experiment that took place from May 2018 through August 2019 along an ∼700 km long section of the Aleutian subduction zone spanning Kodiak Island Peninsula. featured 105 broadband seismometers; 30 were deployed onshore, 75 offshore in Ocean Bottom Seismometer (OBS) packages. Additional strong-motion instruments also at six onshore sites. Offshore OBS stretched outer...
[1] The St. Elias orogen is the result of ∼10 Myr oblique convergence and flat-slab subduction in Gulf Alaska between North America Yakutat microplate. Extensive glaciation a complex tectonic environment make this region unique case study which to examine details terrane accretion possible coupled influence climate drivers on structural topographic evolution an orogenic wedge. Reflection seismic profiles across offshore Pamplona zone fold-thrust belt, frontal wedge, provide constraints for...
Present-day seafloor morphology and sediment distribution in the deep-water Surveyor Fan, Gulf of Alaska, is dominated by >700-km-long Channel, an anomaly a system with no major fluvial input or shelf canyons. The supply instead has been provided glacial erosion still-active Chugach–St. Elias orogen, transport across shelf. Glaciation periodically increased St. Range since Miocene, but began dominating spurred enhanced exhumation mid-Pleistocene transition, at ∼1 Ma. Ice associated this...
Research Article| May 01, 2013 Seismic images of the Transition fault and unstable Yakutat–Pacific–North American triple junction S.P.S. Gulick; Gulick 1Institute for Geophysics, Jackson School Geosciences, The University Texas at Austin, 78712, USA Search other works by this author on: GSW Google Scholar R.S. Reece; Reece G.L. Christeson; Christeson H. van Avendonk; Avendonk L.L. Worthington; Worthington 2Department Geology A&M University, College Station, 77843, T.L. Pavlis 3Department...
Intraplate earthquakes induced by anthropogenic fluid injection present unexpected seismic risk to previously quiescent or low seismicity-rate regions. Despite many studies of seismicity, there are relatively few with detailed openly accessible constraints on the interaction between sources and subsurface structures. In this study Raton Basin, we refine source observations from a dense nodal array constrain basin structure using teleseismic receiver functions. The cross-correlation-based...
The eastern syntaxis in the St. Elias orogen (Alaska, USA) is one of most complex and least understood regions within southern Alaska coastal mountain belt. contains many features unique to that are essential understanding structural architecture tectonic history collision between North America allochthonous Yakutat microplate. transition from transpressional structures associated with Queen Charlotte–Fairweather fault system east Yakataga fold-and-thrust belt (YFTB) west. Throughout...
Abstract We merge structural results from the ST. Elias Erosion/tectonics Project (STEEP), other studies, and seismicity data to build a comprehensive, three-dimensional model of lithosphere subduction corner in southern Alaska. The is defined by three surfaces: (1) top subducting surface, (2) Moho surfaces, (3) base surface. eastern edge using tip Yakutat microplate as an anchor. Kinematic reconstructions that anchor suggest modern Fairweather fault likely inherited motion margin 6–10 Ma...
Abstract Ice dynamics, tectonic setting, and sediment supply are the key parameters controlling architecture of high-latitude margins formation trough mouth fans (TMFs). Current understanding these archives paleo–ice streams is based on studies ice sheets adjacent to stable, passive margins, while behavior active, convergent glacier-influenced remains relatively unconstrained. We integrate high-resolution seismic data chronology from Integrated Ocean Drilling Program Expedition 341 cores in...
We demonstrate a case of using teleseisms recorded on single‐channel high‐frequency geophones to image upper crustal structure around the Bighorn Mountains north‐central Wyoming, USA. Our approach produces images that are analogous those from low frequency version conventional active source seismic reflection profiles except wave fields distant earthquakes used as sources. After wavelet is removed seismograms, distinct phase, PpPdp , evident in resultant record. depth conversion, we show...
Research Article| August 08, 2018 Upper‐Crustal Shear‐Wave Velocity Structure of the South‐Central Rio Grande Rift above Socorro Magma Body Imaged with Ambient Noise by Large‐N Sevilleta Seismic Array N. R. Ranasinghe; Ranasinghe aDepartment Earth and Planetary Sciences, University New Mexico, MSCO3‐2040, 1, Albuquerque, Mexico 87131 U.S.A., nranasinghe@unm.edu Search for other works this author on: GSW Google Scholar L. Worthington; Worthington C. Jiang; Jiang B. Schmandt; Schmandt T. S....
Abstract Plate motion obliquity along the dominantly transform Queen Charlotte plate boundary (QCPB) peaks offshore Haida Gwaii. To investigate effects of on deformation, we analyze continuous seismic waveforms from temporary and permanent stations 1998 to 2020 generate a catalog ∼50,000 earthquakes across We use an automated technique based auto‐regressive phase detection onset estimation obtain initial catalog, integrate existing catalogs, invert for 3D velocity structure using data best...
The Suckling Hills and Kayak Island are isolated mountain blocks located along strike from each other within the foreland of St. Elias orogen in southern Alaska. These preserve an erosional surface that was deformed by slip on northwest‐dipping reverse faults Pleistocene. We suggest Fault Zone form a segmented fault network links with Bering Glacier structure to north. This separates central Yakataga fold thrust belt complex, multiply structures western syntaxis. Ongoing accretion Yakutat...
Abstract Pore pressures in sediments at convergent margins play an important role driving chemical fluxes and controlling deformation styles localization. In the Bering Trough offshore Southern Alaska, extreme sedimentation rates over last 140 kyr as a result of glacial advance/retreats on continental shelf have resulted elevated pore fluid slope overlying Pamplona Zone fold thrust belt, accretionary wedge resulting from subduction Yakutat microplate beneath North American Plate. Based...
The uncertain response of marine terminating outlet glaciers to climate change at time scales beyond short-term observation limits models future sea level rise. At temperate tidewater margins, abundant subglacial meltwater forms morainal banks (marine shoals) or ice-contact deltas that reduce water depth, stabilizing grounding lines and slowing reversing glacial retreat. Here we present a radiocarbon-dated record from Integrated Ocean Drilling Program (IODP) Site U1421 tracks the terminus...