A5008224856- Seismic Imaging and Inversion Techniques
- Hydraulic Fracturing and Reservoir Analysis
- Seismic Waves and Analysis
- Drilling and Well Engineering
- Climate change and permafrost
- earthquake and tectonic studies
- Cryospheric studies and observations
- CO2 Sequestration and Geologic Interactions
- Seismology and Earthquake Studies
- Advanced Fiber Optic Sensors
- Geophysical Methods and Applications
- Tunneling and Rock Mechanics
- Soil Moisture and Remote Sensing
- Remote Sensing and LiDAR Applications
- Groundwater flow and contamination studies
- Geophysics and Sensor Technology
- Geological Studies and Exploration
- Geology and Paleoclimatology Research
- Nuclear Materials and Properties
- Remote Sensing in Agriculture
- Indigenous Studies and Ecology
- Rangeland Management and Livestock Ecology
- Plant and Fungal Interactions Research
- Smart Agriculture and AI
- Rock Mechanics and Modeling
Lawrence Berkeley National Laboratory
2016-2025
Energy Biosciences Institute
2020-2021
Abstract. The success of geological carbon storage depends on the assurance permanent containment for injected dioxide (CO2) in formation at depth. One critical elements safekeeping CO2 is sealing capacity caprock overlying despite faults and/or fractures, which may occur it. In this work, we present an ongoing injection experiment performed a fault hosted clay Mont Terri underground rock laboratory (NW Switzerland). aims to improve our understanding main physical and chemical mechanisms...
Abstract Understanding the interactions among agricultural processes, soil, and plants is necessary for optimizing crop yield productivity. This study focuses on developing effective monitoring analysis methodologies that estimate key soil plant properties. These include data acquisition processing approaches use unmanned aerial vehicles (UAVs) surface geophysical techniques. In particular, we applied these to a soybean farm in Arkansas characterize soil–plant coupled spatial temporal...
Abstract In a high‐pressure injection fault activation experiment conducted at the Mont Terri underground research laboratory in Switzerland, transmissivity of Opalinus Clay significantly increased due to opening and shearing. The fluid injection, spanning few hours, generated 10 m radius patch. Subsequent pressure pulse tests bi‐weekly for year revealed gradual return its initial state. study utilized decay analysis, optical fiber monitoring, continuous active source seismic measurements...
Improving understanding of Arctic ecosystem climate feedback and parameterization models that simulate freeze-thaw dynamics require advances in quantifying soil snow properties. Due to the significant spatiotemporal variability properties limited information provided by point-scale measurements (e.g., cores), geophysical methods hold potential for improving permafrost characterization. In this study, we evaluate use a ground-penetrating radar (GPR) estimate thaw layer thickness, depth,...
Abstract. Ice-wedge polygons are common Arctic landforms. The future of these landforms in a warming climate depends on the bidirectional feedback between rate ice-wedge degradation and changes hydrological characteristics. This work aims to better understand relative roles vertical horizontal water fluxes subsurface polygonal landscapes, providing new insights data test calibrate models. Field-scale investigations were conducted at an intensively instrumented location Barrow Environmental...
Abstract We provide direct observations of the three‐dimensional displacements a fluid‐driven fracture during water injections in borehole at ∼1.5 km depth crystalline rock Sanford Underground Research Facility (USA). Micro‐shearing initiates on foliation plane 61% minimum principal stress σ 3 . As fluid pressure increases further up to 112% 3, axial and radial increase with injection time highlighting opening sliding new hydrofracture growing ∼10 m away from borehole, accordance ambient...
Abstract We conducted a time‐lapse seismic experiment utilizing automated active source and sensor arrays to monitor reactivated fault within the Opalinus clay formation at Mont Terri Rock Laboratory (Switzerland), an analog caprock for geologic carbon storage. A series of six brine injections were into so‐called Main Fault reactivate it. Seismic instrumentation in five monitoring boreholes on either side was used continuously probe changes P‐wave travel‐times associated with displacement...
Abstract We use Distributed Strain Sensing (DSS) through Brillouin scattering measurements to characterize the reactivation of a fault zone in shale (Opalinus clay), caused by excavation gallery at ∼400 m depth Mont Terri Underground Laboratory (Switzerland). DSS fibers are cemented behind casing six boreholes cross‐cutting zone. compare data with co‐located displacement from chain potentiometer and three‐dimensional sensor (SIMFIP). proves be able detect in‐ off‐fault strain variations...
Abstract Permafrost physicochemical parameters play a key role in controlling the response of permafrost carbon to climate change. We studied an Arctic tundra region evaluate (1) how soil vary with depth and whether they are interrelated, (2) differs from its overlaying active layer, (3) property‐depth relationships different across geomorphic features (e.g., low, flat, high centered polygons). also explored possible biogeochemical processes that led these characteristics may affect...
Improving understanding of Arctic ecosystem functioning and parameterization models that simulate freeze-thaw dynamics require advances in quantifying soil snow properties. Due to the significant spatiotemporal variability properties limited information provided by point-scale measurements (e.g., cores), geophysical methods hold potential for improving permafrost characterization. In this study, we evaluate use Ground Penetrating Radar (GPR) estimate thaw layer thickness, depth ice-wedge...
<p><span>Tunnel excavations are known to perturb the hosting rock mass at long distances, with changes in hydrogeological flow affecting, as well deforming mass, inducing subsidence a zone above tunnel. During extension of Mont Terri Underground Rock Laboratory, we had unique opportunity monitor final part excavation Gallery18 and breaktrough.</span></p><p><span>The joint effort two experiments (CS-D lead by...
Earth and Space Science Open Archive This preprint has been submitted to is under consideration at Geophysical Research Letters. ESSOAr a venue for early communication or feedback before peer review. Data may be preliminary.Learn more about preprints preprintOpen AccessYou are viewing the latest version by default [v1]In-situ observation of pre-, co- post-seismic shear slip 1.5 km depthAuthorsMartinSchoenballiDYvesGuglielmiJonathan BlairAjo-FranklinPaul JCookPatrickDobsoniDChetHoppTimothy...
The reactivation mechanisms of coseismic surface ruptures associated with the 2011 Mw 6.7 Fukushima-ken Hamadori earthquake in Japan are investigated using in-situ controlled hydraulic injections subsurface boreholes. Two fault segments were selected for studies, one across a rupture, Shionohira site, and non-coseismically ruptured segment, Minakami-kita site. A series water sealed sections boreholes set progressively bring to rupture by step-by-step decrease effective normal stress clamping...
Abstract. The success of geological carbon storage depends on the assurance a permanent confinement injected CO2 in formation at depth. One critical elements safekeeping is sealing capacity caprock overlying formation, despite faults and/or fractures, which may occur it. In this work, we present an ongoing injection experiment performed fault hosted clay Mont Terri underground rock laboratory (NW Switzerland). aims improving our understanding main physical and chemical mechanisms controlling...
We present preliminary data from a continuous active-source seismic monitoring (CASSM) experiment conducted during series of small volume brine injections, directly into the fault at Mont Terri, Switzerland, CO2 storage caprock analog. utilized this to relate observed signature development leakage pathway associated with hydromechanical reactivation. This time-lapse system includes 24 sources and 44 receivers in five boreholes situated on either side fault. The temporal resolution is <8 min,...
Earth and Space Science Open Archive This work has been accepted for publication in Journal of Geophysical Research - Solid Earth. Version RecordESSOAr is a venue early communication or feedback before peer review. Data may be preliminary. Learn more about preprints. preprintOpen AccessYou are viewing the latest version by default [v2]The effect fault architecture on slip behavior shale revealed distributed fiber optic strain sensingAuthorsChetHoppYvesGuglielmiAntonio...
Abstract Although closure detection has a crucial role in hydraulic fracturing operations, significant debate surrounds the various methodologies to determine its value. Several competing have been presented literature that sometimesyield significantly different estimates of pressure and time. The conventional techniques rely on assumptions may be or even contradictory. continuous wavelets transform technique is data convolves and/or temperature using short wavy signal called "wavelet"....
Identifying and monitoring the reactivation of faults opening fractures affecting low permeability, sealing formations in natural underground storage complexes such as Carbon Capture Storage projects Nuclear Waste repositories is essential to ensure integrity containment. Although passive seismic can be effective for detecting induced failure, stress accumulation fault occur aseismically clay-rich formations, preventing early failure recognized. Here, we investigate potential applying strain...