@article{fdi:010088874,
  title = {{C}ontrol of seismicity migration in earthquake swarms by injected fluid volume and aseismic crack propagation},
  author = {{D}anre, {P}. and {G}aragash, {D}. and {D}e {B}arros, {L}. and {C}appa, {F}. and {A}mpuero, {J}ean-{P}aul},
  editor = {},
  language = {{ENG}},
  abstract = {{T}he evolution of fluid injection-induced seismicity, generally characterized through the number of events or their seismic moment, depends on, among other factors, the injected fluid volume. {M}igration of seismicity is observed during those sequences and might be caused by a range of mechanisms: fluid pressure diffusion, fluid-induced aseismic slip propagating along a stimulated fault, interactions between earthquakes. {R}ecent theoretical and observational developments underline the important effect on seismicity migration of structural parameters, like fault criticality, or injection parameters, like flow rate or pressurization rate. {H}ere, we analyze two well-studied injection-induced seismic sequences at the {S}oultz-sous-{F}oret and {B}asel geothermal sites, and find that the evolution of the seismicity front distance primarily depends on the injected fluid volume. {B}ased on a fracture mechanics model, we develop new equations relating seismicity migration to injected fluid volume and frictional and structural properties of the fault. {W}e find that the propagation of a fluid-induced aseismic slip front along the stimulated fault, triggering seismicity, explains well the observations made on the two sequences. {T}his model allows us to constrain parameters describing the seismicity front evolution and explains the diversity of migration patterns observed in injection-induced and natural earthquake swarms. {I}njection of fluids at depth may induce earthquakes, which can represent a hazard both for reservoir activities and populations. {T}he magnitude and number of earthquakes depend, at first order, on the injected fluid volume. {I}nduced seismicity has also been observed to migrate away from the injection area, with a diversity of velocities and patterns. {M}igration has been attributed to several mechanisms like the diffusion of a pore pressure perturbation along the fault, earthquakes triggering each other, or the propagation of a silent aseismic slip. {H}ere, we combine recent theoretical and observational developments to propose a new model to explain the migration of seismicity in two well-studied induced sequences in {F}rance and {S}witzerland. {O}ur model directly relates migration distance to injected fluid volume and other physical parameters describing the frictional or stress properties of the stimulated faults. {T}his generic model explains seismicity propagation and provides constraints on the relevant physical parameters controlling it. {W}e apply our approach to earthquake swarms occurring in natural context, and reconstruct fluid circulation dynamics during those sequences. {I}nduced seismicity front position correlates with cumulative injected fluid volume{A}n aseismic crack model driven by fluid injection explains the observed slip distribution and seismicity migrations{O}ur results enable the reconstruction of a wide range of migration patterns within earthquake swarms and their injection history},
  keywords = {{S}eismology ; fluid injection ; induced seismicity ; mechanics ; earthquake ; swarm},
  booktitle = {},
  journal = {{J}ournal of {G}eophysical {R}esearch : {S}olid {E}arth},
  volume = {129},
  numero = {1},
  pages = {e2023{JB}027276 [21 p.]},
  ISSN = {2169-9313},
  year = {2024},
  DOI = {10.1029/2023jb027276},
  URL = {https://www.documentation.ird.fr/hor/fdi:010088874},
}