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Article
Open AccessA laboratory perspective on accelerating preparatory processes before earthquakes and implications for foreshock detectability
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...
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Article
Open AccessDeformation Behavior and Seismic Characteristics of Sandy Facies Opalinus Clay During Triaxial Deformation Under Dry and Wet Conditions
Unconsolidated, undrained triaxial deformation tests were performed on sandy facies Opalinus Clay at 50 MPa confining pressure to characterize the effect of water and microfabric orientation on the deformation...
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Article
Open AccessAuthor Correction: Earthquake energy dissipation in a fracture mechanics framework
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Article
Open AccessEarthquake energy dissipation in a fracture mechanics framework
Earthquakes are rupture-like processes that propagate along tectonic faults and cause seismic waves. The propagation speed and final area of the rupture, which determine an earthquake’s potential impact, are d...
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Article
Open AccessPerformance Evaluation of AE Sensors Installed Like Hydrophones in Adaptive Monitoring Networks During a Decametre-Scale Hydraulic Stimulation Experiment
In the framework of the STIMTEC and STIMTEC-X hydraulic stimulation experiments at the Reiche Zeche mine, Freiberg (Germany), we installed acoustic emission (AE) sensors for the recording of picoseismicity bot...
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Article
Open AccessStrain Partitioning and Frictional Behavior of Opalinus Clay During Fault Reactivation
The Opalinus Clay (OPA) formation is considered a suitable host rock candidate for nuclear waste storage. However, the sealing integrity and long-term safety of OPA are potentially compromised by pre-existing ...
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Article
Open AccessA Synthesis of Fracture, Friction and Damage Processes in Earthquake Rupture Zones
We review properties and processes of earthquake rupture zones based on field studies, laboratory observations, theoretical models and simulations, with the goal of assessing the possible dominance of differen...
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Article
Open AccessAuthors’ Reply to the Discussion by Crisci et al. (2021) on “Experimental Deformation of Opalinus Clay at Elevated Temperature and Pressure Conditions Mechanical Properties and the Influence of Rock Fabric”
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Article
Open AccessExperimental Deformation of Opalinus Clay at Elevated Temperature and Pressure Conditions: Mechanical Properties and the Influence of Rock Fabric
The mechanical behavior of the sandy facies of Opalinus Clay (OPA) was investigated in 42 triaxial tests performed on dry samples at unconsolidated, undrained conditions at confining pressures (pc) of 50–100 MPa,...
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Article
Open AccessExperimental Investigation on Static and Dynamic Bulk Moduli of Dry and Fluid-Saturated Porous Sandstones
Knowledge of pressure-dependent static and dynamic moduli of porous reservoir rocks is of key importance for evaluating geological setting of a reservoir in geo-energy applications. We examined experimentally ...
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Article
Open AccessSeismic and Aseismic Preparatory Processes Before Large Stick–Slip Failure
Natural earthquakes often have very few observable foreshocks which significantly complicates tracking potential preparatory processes. To better characterize expected preparatory processes before failures, we...
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Article
Design and implementation of a traffic light system for deep geothermal well stimulation in Finland
We describe the design and implementation of a traffic light system (TLS) created for the stimulation phase of a 6.1-km-deep geothermal well in the Helsinki area, Finland. Because of the lack of local seismic ...
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Article
Geophysical Borehole Observatory at the North Anatolian Fault in the Eastern Sea of Marmara (GONAF): initial results
Given its intense seismic activity and damaging earthquake generation potential, the western part of the North Anatolian Fault constitutes a serious natural hazard. As a result, the fault is monitored with a b...
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Article
Open AccessMicroearthquakes preceding a M4.2 Earthquake Offshore Istanbul
A primary hurdle in observing small foreshocks is the detection-limit of most seismic networks, which is typically about magnitude M1-1.5. We show that a start-up test of a borehole-based seismic network with ...
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Chapter and Conference Paper
Compaction Bands in a Porous Sandstone Sample with Pre-induced Shear Bands
Understanding how different modes of deformation bands may interact at the same rock mass is of crucial importance, since such interaction may affect the flow properties within the reservoir rock. In this work...
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Article
Open AccessUniversal Quake Statistics: From Compressed Nanocrystals to Earthquakes
Slowly-compressed single crystals, bulk metallic glasses (BMGs), rocks, granular materials and the earth all deform via intermittent slips or “quakes”. We find that although these systems span 12 decades in le...
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Article
Mining-Induced Stress Transfer and Its Relation to a \(\text{M}_w\) 1.9 Seismic Event in an Ultra-deep South African Gold Mine
On 27 December 2007, a \(\text{M}_w\) M ...
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Article
An earthquake gap south of Istanbul
Over the last century the North Anatolian Fault Zone in Turkey has produced a remarkable sequence of large earthquakes. These events have now left an earthquake gap south of Istanbul and beneath the Marmara Se...
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Article
Microseismicity induced during fluid-injection: A case study from the geothermal site at Groß Schönebeck, North German Basin
The technical feasibility of geothermal power production in a low enthalpy environment will be investigated in the geothermal site at Groß Schönebeck, North German Basin, where a borehole doublet was completed...
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Article
Reaction rim growth in the system MgO-Al2O3-SiO2 under uniaxial stress
We synthesize reaction rims between thermodynamically incompatible phases in the system MgO-Al2O3-SiO2 applying uniaxial load using a creep apparatus. Synthesis experiments are done in the MgO-SiO2 and in the MgO...
