scholarly journals Static behaviour of induced seismicity

2016 ◽  
Vol 23 (2) ◽  
pp. 107-113 ◽  
Author(s):  
Arnaud Mignan
Keyword(s):  
Stress Field ◽  
Induced Seismicity ◽  
Explanatory Power ◽  
Static Stress ◽  
Geothermal System ◽  
Geometrical Approach ◽  
Linear Diffusion ◽  
Temporal Behaviour ◽  
Diffusion Dynamics ◽  
Spatio Temporal

Abstract. The standard paradigm to describe seismicity induced by fluid injection is to apply non-linear diffusion dynamics in a poroelastic medium. I show that the spatio-temporal behaviour and rate evolution of induced seismicity can, instead, be expressed by geometric operations on a static stress field produced by volume change at depth. I obtain laws similar in form to the ones derived from poroelasticity while requiring a lower description length. Although fluid flow is known to occur in the ground, it is not pertinent to the geometrical description of the spatio-temporal patterns of induced seismicity. The proposed model is equivalent to the static stress model for tectonic foreshocks generated by the Non-Critical Precursory Accelerating Seismicity Theory. This study hence verifies the explanatory power of this theory outside of its original scope and provides an alternative physical approach to poroelasticity for the modelling of induced seismicity. The applicability of the proposed geometrical approach is illustrated for the case of the 2006, Basel enhanced geothermal system stimulation experiment. Applicability to more problematic cases where the stress field may be spatially heterogeneous is also discussed.

scholarly journals Static behaviour of induced seismicity

2015 ◽  
Vol 2 (6) ◽  
pp. 1659-1674
Author(s):  
A. Mignan
Keyword(s):  
Nonlinear Diffusion ◽  
Induced Seismicity ◽  
Explanatory Power ◽  
Static Stress ◽  
Fluid Injection ◽  
Poroelastic Medium ◽  
Proposed Model ◽  
Diffusion Dynamics ◽  
Precursory Accelerating Seismicity ◽  
Static Behaviour

Abstract. The standard paradigm to describe seismicity induced by fluid injection is to apply nonlinear diffusion dynamics in a poroelastic medium. I show that the spatiotemporal behaviour and rate evolution of induced seismicity can, instead, be expressed by geometric operations on a static stress field produced by volume change at depth. I obtain laws similar in form to the ones derived from poroelasticity while requiring a lower description length. Although fluid flow is known to occur in the ground, it is not pertinent to the behaviour of induced seismicity. The proposed model is equivalent to the static stress model for tectonic foreshocks generated by the Non-Critical Precursory Accelerating Seismicity Theory. This study hence verifies the explanatory power of this theory outside of its original scope.

Spatio-temporal regimes in Rayleigh–Bénard convection in a small rectangular cell

1989 ◽  
Vol 209 ◽  
pp. 309-334 ◽  
Author(s):  
M. A. Rubio ◽  
P. Bigazzi ◽  
L. Albavetti ◽  
S. Ciliberto
Keyword(s):  
Travelling Waves ◽  
Rectangular Cell ◽  
Complex Behaviour ◽  
Temporal Behaviour ◽  
Bénard Convection ◽  
Benard Convection ◽  
Spatio Temporal ◽  
Roll Axis ◽  
Rayleigh Benard Convection ◽  
Rayleigh Benard

By means of an original optical technique we have studied the spatio-temporal behaviour in a Rayleigh–Bénard convection experiment of small rectangular geometry. The experimental technique allows complete reconstruction of the temperature field integrated along the roll axis. Two main spatiotemporal regimes have been found, corresponding to localized oscillations and travelling waves respectively. Several parameters are proposed for the quantitative characterization of this complex behaviour.

scholarly journals Geospatial Analysis and Mapping Strategies for Fine Grained and Detailed COVID-19 Data With Geographic Information Systems

2021 ◽  
Author(s):  
ÁNGEL MIRAMONTES CARBALLADA ◽  
JOSE BALSA-BARREIRO
Keyword(s):  
Geographic Location ◽  
Social Contact ◽  
Temporal Behaviour ◽  
Fine Grained ◽  
Health Authorities ◽  
Public Health Authorities ◽  
Spatio Temporal ◽  
Media Reports ◽  
Predictive Risk ◽  
The Impact

Abstract The CoVID-19 pandemic is showing a dramatic impact across the world. To the tragedy of the loss of human lives, we must add the great uncertainty that the new coronavirus is causing to our lives. Governments and public health authorities must be able to respond this emergency by taking the appropriate decisions for minimizing the impact of the virus. In the absence of an immediate solution, governments have concentrated their efforts on adopting non-pharmaceutical interventions for restricting the mobility of people and reducing the social contact. Health authorities are publishing most of data for supporting their interventions and policies. The geographic location of the cases is a vital information with exceptional value for analysing the spatio-temporal behaviour of the virus, doing feasible to anticipate potential outbreaks and to elaborate predictive risk mapping. In fact, a great number of media reports, research papers, and web-browsers have presented the COVID-19 disease spreading by using maps. However, processing and visualization of this sort of data presents some aspects that must be carefully reviewed. Based on our experience with fine-grained and detailed data related to COVID-19 in a Spanish region, we present a bunch of mapping strategies and good practices using geospatial tools. The ultimate goal is create appropriate maps at any spatial scale while avoiding conflicts with data such as those related to patients’ privacy.

Periodic and irregular spatio-temporal behaviour of current density filaments in Si p+−n+ −p−n− diodes

1993 ◽  
Vol 180 (1-2) ◽  
pp. 113-118 ◽  
Author(s):  
F.-J Niedernostheide ◽  
M Kreimer ◽  
H.-J Schulze ◽  
H.-G Purwins
Keyword(s):  
Current Density ◽  
Temporal Behaviour ◽  
Spatio Temporal

On the motion of space charge in a dielectric medium

1971 ◽  
Vol 269 (1195) ◽  
pp. 217-232 ◽  
Keyword(s):  
Space Charge ◽  
General Relation ◽  
Dielectric Medium ◽  
External Current ◽  
Parallel Plate Capacitor ◽  
Temporal Behaviour ◽  
Space Charges ◽  
Diffusion Effects ◽  
Spatio Temporal ◽  
Ideal Dielectric

A general relation is derived which describes the spatio-temporal behaviour of space charge in an ideal dielectric medium. (Diffusion effects are neglected.) This result is used to determine the behaviour of a parallel plate capacitor which contains space charges near its electrodes. Expressions are derived for the variation with time of the potential difference between the plates following the removal of an applied voltage and for the external current which flows when the plates are connected together. Symmetrical and asymmetrical charge distributions are considered.

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