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DOI: 10.5445/IR/1000071276

Fluid-induced seismicity : Comparison of rate- and state- and critical pressure theory

Wenzel, Friedemann

Abstract:
nduced seismicity as generated by the injection of fluids in a homogeneous, permeable medium with faults with variable proximity to rupture conditions is simulated using the rate- and state-dependent frictional fault theory (RST) of Dieterich (J Geophys Res 99(B2):2601-2618, 1994) and the critical pressure theory (CPT) developed by Shapiro (Fluid-induced seismicity, Cambridge University Press, Cambridge, 2015). In CPT, the induced local seismicity density is proportional to the pressure rate, limited by the Kaiser Effect, and apparently un-related to the tectonic background seismicity. There is no time delay between a change in pressure rate and seismicity density. As a more complex theory, RST includes a time delay between a pressure change and induced seismicity and it is proportional to the natural tectonic background seismicity. Comparing both modelling approaches at a fixed location, this delay can be significant, dependent on a ‘free’ parameter that represents the lower threshold for pressure below which seismicity is not triggered. This parameter can be tuned so that the results of CPT and RST become similar. Approximations o ... mehr


Zugehörige Institution(en) am KIT Geophysikalisches Institut (GPI)
Publikationstyp Zeitschriftenaufsatz
Jahr 2017
Sprache Englisch
Identifikator ISSN: 2195-9706
URN: urn:nbn:de:swb:90-712763
KITopen ID: 1000071276
HGF-Programm 35.14.01; LK 01
Erschienen in Geothermal Energy
Band 5
Heft 1
Seiten Art. Nr. 5
Schlagworte Fluid-induced seismicity, Pressure diffusion, Rate- and state-dependent frictional fault theory, Critical pressure theory
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