Thermo‐poro‐mechanics of chemically active creeping faults. 1: Theory and steady state considerations

Journal of Geophysical Research: Solid Earth - Tập 119 Số 6 - Trang 4558-4582 - 2014
Sotiris Alevizos1, Thomas Poulet2, Manolis Veveakis2
1Department of Mechanics, School of Applied Mathematical and Physical Sciences, National Technical University of Athens, Athens, Greece
2CSIRO, Earth Science and Resource Engineering, Kensington, Western Australia, Australia

Tóm tắt

AbstractIn this paper, we study the behavior of a fluid‐saturated fault under shear, based on the assumption that the material inside exhibits rate‐ and temperature‐dependent frictional behavior. A creeping fault of this type can produce excess heat due to shear heating, reaching temperatures which are high enough to trigger endothermic chemical reactions. We focus on fluid‐release reactions and incorporate excess pore pressure generation and porosity variations due to the chemical effects (a process called chemical pressurization). We provide the mathematical formulation for coupled thermo‐hydro‐chemo‐mechanical processes and study the influence of the frictional, hydraulic, and chemical properties of the material, along with the boundary conditions of the problem on the behavior of the fault. Regimes of stable‐frictional sliding and pressurization emerge, and the conditions for the appearance of periodic creep‐to‐pressurization instabilities are then derived. The model thus extends the classical mechanical stick‐slip instabilities by identifying chemical pressurization as the process governing the slip phase. The different stability regimes identified match the geological observations about subduction zones. The model presented was specifically tested in the Episodic Tremor and Slip sequence of the Cascadia megathrust, reproducing the displacement data available from the GPS network installed. Through this process, we identify that the slow slip events in Cascadia could be due to the in situ dehydration of serpentinite minerals. During this process, the fluid pressures increase to sublithostatic values and lead to the weakening of the creeping slab.

Từ khóa


Tài liệu tham khảo

10.1029/2007JF000867

10.1029/2007JB005551

10.1029/2009JB006533

10.1029/2010JB007876

10.1130/G31424.1

10.1137/0903012

10.1016/j.enggeo.2005.04.004

10.1016/j.geomorph.2005.02.004

10.1029/2009GL040465

10.1090/qam/998099

10.1130/G34421.1

Coussy O. (Ed.), 2004, Poromechanics

10.1029/JB077i020p03690

10.1007/BF00876539

10.1038/nature02249

10.1016/j.epsl.2007.10.041

10.1111/j.1365‐3121.2010.00955.x

10.1029/2005JB003869

Fowler A. (Ed.), 1997, Mathematical Models in the Applied Sciences,

10.1029/2011JB008889

10.1029/2001JB001653

10.1029/2002JB002218

10.1029/2006GL028895

10.1122/1.548954

10.1016/0022-5096(84)90007-3

10.1088/0305-4470/31/10/002

10.1126/science.1139763

10.1007/s00015-008-1259-z

10.1126/science.1148494

10.1029/2007GL030743

10.1016/0009-2509(91)85019-T

10.1061/(ASCE)0733-9410(1990)116:12(1778)

10.1016/S0013-7952(01)00114-4

10.1088/0034-4885/67/8/R03

10.1017/CBO9780511804892

10.1038/ngeo1559

10.1016/S0191-8141(97)00005-9

10.1016/0010-2180(66)90077-0

10.1126/science.1096535

10.1017/CBO9780511754517

Leinenkugel H.(1976) Deformations und festigkeitverhalten bindiger erdstoffe: Experimental ergebnisse und ihre physikalische deutung doctoral Dissertation Univ. Karlsruhe Karlsruhe Germany.

10.1029/1999GL008380

10.1029/2007JB004930

L'vov B., 2007, Hot Topics in Thermal Analysis and Calorimetry

10.1016/S0040-6031(02)00080-1

10.1029/2006GL027143

10.1007/BF00701669

10.1146/annurev.earth.26.1.643

10.1016/0094-5765(79)90129-2

10.1016/0094-5765(79)90080-8

NASA(2013) Jet propulsion laboratory. [Available athttp://sideshow.jpl.nasa.gov/post/series.html.]

10.1126/science.1070378

10.1016/j.pepi.2010.07.005

10.1130/G31398.1

10.1130/G31649.1

10.1016/S0065-2156(08)70009-7

10.1016/j.crte.2003.11.012

10.1007/s00024-009-0520-3

10.1016/S0022-5096(01)00042-4

10.1029/2005JB004006

Robertson E., 1964, A Study of Serpentinite: The AMSOC Core Hole Near Mayaguez, Puerto Rico, 118

10.1126/science.1084783

10.1016/S0022-5096(99)00048-4

10.1016/j.epsl.2012.04.030

10.1029/JB088iB12p10359

10.1016/0038‐1098(72)90894‐0

Sato T., 1997, Geochemical changes in anomalously discharged groundwater in Awaji Island after the 1995 Kobe earthquake, Chikyukagaku, 31, 89

10.1038/34097

10.1029/JB079i017p02615

10.1029/2008JB006004

10.1002/nag.584

10.1007/s10035‐010‐0244‐1

10.1029/2012GC004214

10.1098/rspa.1934.0004

10.1126/science.1121012

10.1007/978-3-642-45943-6_2

10.1029/JB091iB09p09452

Tyburczy J., 1988, Proceedings of the 18th Lunar and Planetary Science Conference, 435

10.1016/S0020-7683(02)00179-8

10.1680/geot.2002.52.3.157

Vardoulakis I., 1995, Bifurcation Analysis in Geomechanics

10.1029/2006JF000702

10.1016/j.jmps.2010.06.010

10.1016/j.jsg.2011.09.012

10.1680/geolett.12.00063

10.1002/2013JB010071

Weber J. N., 1965, Dehydroxylation of kaolinite, dickite and halloysite: Heats of reaction and kinetics of dehydration at pnro: 15 psi., Am. Mineral., 50, 1038

10.1038/nature03901

10.1017/S0022143000011977

10.1029/JB095iB10p15589

Thông tin
Thông tin xuất bản

Journal of Geophysical Research: Solid Earth

Tập 119 Số 6

4558-4582

Thông tin tác giả