Thomas Goebel
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View article: Does <i>b</i>‐Value Increase With Pore‐Pressure?: Insights From Laboratory Experiments and Induced Seismicity
Does <i>b</i>‐Value Increase With Pore‐Pressure?: Insights From Laboratory Experiments and Induced Seismicity Open
Anthropogenic activities like fluid injection can increase pore‐pressure and induce seismicity. Variations in the b ‐value (slope of the frequency‐magnitude distribution) of induced and natural seismic events are thought to reflect the str…
View article: The Effect of Hydrothermal Alteration and Microcracks on Hydraulic Properties and Poroelastic Deformation: A Case Study of the Blue Mountain Geothermal Field
The Effect of Hydrothermal Alteration and Microcracks on Hydraulic Properties and Poroelastic Deformation: A Case Study of the Blue Mountain Geothermal Field Open
Geothermal energy plays a vital role in decarbonizing electricity and heat supply. Effective utilization of geothermal resources hinges on identifying or generating permeable reservoir zones and understanding how effective pressure variati…
View article: Magnitude Clustering During Stick‐Slip Dynamics on Laboratory Faults
Magnitude Clustering During Stick‐Slip Dynamics on Laboratory Faults Open
We present an analysis of magnitude clustering of microfractures inferred from acoustic emissions (AEs) during stick‐slip (SS) dynamics of faulted Westerly granite samples in frictional sliding experiments, with and without fluids, under t…
View article: A laboratory perspective on accelerating preparatory processes before earthquakes and implications for foreshock detectability
A laboratory perspective on accelerating preparatory processes before earthquakes and implications for foreshock detectability Open
Dynamic failure in the laboratory is commonly preceded by many foreshocks which accompany premonitory aseismic slip. Aseismic slip is also thought to govern earthquake nucleation in nature, yet, foreshocks are rare. Here, we examine how he…
View article: Intermittent Criticality Multi‐Scale Processes Leading to Large Slip Events on Rough Laboratory Faults
Intermittent Criticality Multi‐Scale Processes Leading to Large Slip Events on Rough Laboratory Faults Open
We discuss data of three laboratory stick‐slip experiments on Westerly Granite samples performed at elevated confining pressure and constant displacement rate on rough fracture surfaces. The experiments produced complex slip patterns inclu…
View article: Inferring damage state and evolution with increasing stress using direct and coda wave velocity measurements in faulted and intact granite samples
Inferring damage state and evolution with increasing stress using direct and coda wave velocity measurements in faulted and intact granite samples Open
SUMMARY A better understanding of damage accumulation before dynamic failure events in geological material is essential to improve seismic hazard assessment. Previous research has demonstrated the sensitivity of seismic velocities to varia…
View article: Complex multi-scale preparatory processes of stick-slip events on rough laboratory faults
Complex multi-scale preparatory processes of stick-slip events on rough laboratory faults Open
We discuss data of laboratory stick-slip experiments on Westerly Granite samples performed at elevated confining pressure and constant displacement rate on rough pre-fractured faults. The experiments produced complex slip patterns includin…
View article: Fault Roughness Promotes Earthquake‐Like Aftershock Clustering in the Lab
Fault Roughness Promotes Earthquake‐Like Aftershock Clustering in the Lab Open
Earthquakes rarely occur in isolation but rather as complex sequences of fore, main and aftershocks. Assessing the associated seismic hazard requires a holistic view of event interactions. We conduct frictional sliding experiments on fault…
View article: Regional Characteristics of Observable Foreshocks
Regional Characteristics of Observable Foreshocks Open
Measures of foreshock occurrence are systematically examined using earthquake catalogs for eight regions (Italy, southern California, northern California, Costa Rica, Onshore Japan, Alaska, Turkey, and Greece) after imposing a magnitude ≥3…
View article: Observations and mechanisms of distant and deep injection induced earthquakes in California and Oklahoma hydrocarbon basins
Observations and mechanisms of distant and deep injection induced earthquakes in California and Oklahoma hydrocarbon basins Open
Earth and Space Science Open Archive PosterOpen AccessYou are viewing the latest version by default [v1]Observations and mechanisms of distant and deep injection induced earthquakes in California and Oklahoma hydrocarbon basinsAuthorsThoma…
View article: What Controls the Presence and Characteristics of Aftershocks in Rock Fracture in the Lab?
What Controls the Presence and Characteristics of Aftershocks in Rock Fracture in the Lab? Open
Aftershock cascades are a characteristic feature of natural seismicity, but underlying mechanisms remain debated. Here, we experimentally explore the presence or absence of aftershocks during failure of intact rock and slip on newly create…
View article: Understanding and Anticipating Induced Seismicity
Understanding and Anticipating Induced Seismicity Open
A new special collection in JGR: Solid Earth and Earth and Space Science seeks papers from across disciplines that provide insights into induced seismicity at different spatial and temporal scales.
View article: Measuring Fault Zone and Host Rock Hydraulic Properties Using Tidal Responses
Measuring Fault Zone and Host Rock Hydraulic Properties Using Tidal Responses Open
Pore pressure diffusion along faults influences induced seismicity and rupture mechanics. In situ hydraulic diffusivity measurements along faults are rare and generally lower than inferred from seismicity migration. Here we use the tidal r…
View article: More Than 40 yr of Potentially Induced Seismicity Close to the San Andreas Fault in San Ardo, Central California
More Than 40 yr of Potentially Induced Seismicity Close to the San Andreas Fault in San Ardo, Central California Open
Evidence for fluid-injection-induced seismicity is rare in California hydrocarbon basins, despite widespread injection close to seismically active faults. We investigate a potential case of injection-induced earthquakes associated with San…
View article: Stress drop–magnitude dependence of acoustic emissions during laboratory stick-slip
Stress drop–magnitude dependence of acoustic emissions during laboratory stick-slip Open
SUMMARY Earthquake source parameters such as seismic stress drop and corner frequency are observed to vary widely, leading to persistent discussion on potential scaling of stress drop and event size. Physical mechanisms that govern stress …
View article: Seismic and Aseismic Preparatory Processes Before Large Stick–Slip Failure
Seismic and Aseismic Preparatory Processes Before Large Stick–Slip Failure Open
Natural earthquakes often have very few observable foreshocks which significantly complicates tracking potential preparatory processes. To better characterize expected preparatory processes before failures, we study stick-slip events in a …
View article: Narrow Spatial Aftershock Zones for Induced Earthquake Sequences in Oklahoma
Narrow Spatial Aftershock Zones for Induced Earthquake Sequences in Oklahoma Open
The current paradigm for estimating regional long‐term seismic hazard involves declustering whereby aftershocks are removed from an earthquake catalog to identify the underlying background seismicity rate. Inaccurate declustering can ultim…
View article: Aftershock deficiency of induced earthquake sequences during rapid mitigation efforts in Oklahoma
Aftershock deficiency of induced earthquake sequences during rapid mitigation efforts in Oklahoma Open
Induced seismicity provides a rare opportunity to study earthquake triggering and underlying stress perturbations. Triggering can be a direct result of induced stress changes or indirect due to elastic stress transfer from preceding events…
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View article: Issue Information
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No abstract is available for this article.
View article: The spatial footprint of injection wells in a global compilation of induced earthquake sequences
The spatial footprint of injection wells in a global compilation of induced earthquake sequences Open
Seismic limits for hard and soft rock Induced earthquakes from oil, gas, and geothermal energy exploration projects can damage infrastructure and concern the public. However, it remains unclear how far away from an injection site an earthq…
View article: Triggering Processes in Rock Fracture
Triggering Processes in Rock Fracture Open
We study triggering processes in triaxial compression experiments under a constant displacement rate on sandstone and granite samples using spatially located acoustic emission events and their focal mechanisms. We present strong evidence t…
View article: Comment on “How will induced seismicity in Oklahoma respond to decreased saltwater injection rates?” by C. Langenbruch and M. D. Zoback
Comment on “How will induced seismicity in Oklahoma respond to decreased saltwater injection rates?” by C. Langenbruch and M. D. Zoback Open
Estimates of seismic response to injection rate reduction in Oklahoma are model-dependent and remain uncertain in 2017 and beyond.
View article: Wastewater disposal and earthquake swarm activity at the southern end of the Central Valley, California
Wastewater disposal and earthquake swarm activity at the southern end of the Central Valley, California Open
Fracture and fault zones can channel fluid flow and transmit injection‐induced pore pressure changes over large distances (>km), at which seismicity is rarely suspected to be human induced. We use seismicity analysis and hydrogeological mo…