Abstract
In this paper we report on investigations of frictional rcstrcngthcning during repetitive stick-slip on initially bare granite surfaces (nominal contact area 25 cm2). The tests were conducted in a double-direct shear apparatus at room-temperature and humidity. Normal stress was held constant, and shear was induced by controlling the velocity of a loading piston. Samples exhibited quasi-periodic stick-slip instabilities. Appreciable yielding and precursory creep occur prior to failure. Stress drop amplitudes range from 0.1 to 3.1 MPa (or 4-49% of the failure strength). We study the effects of loading rate (0.5 to 300 µm/s) and normal load (5 and 10 MPa) on stress drop and stick-slip recurrence interval. At a given loading rate, there is a positive correlation between stress drop and recurrence interval, indicating nealing rates of ~4 MPa per decade increase in recurrence time. However, the combined data from all velocities show a lower rate, suggesting an apparent healing rate of ~1 MPa per decade increase in recurrence time. We find a consistent scaling between different loading rates when stress drop is compared to inter-event loading displacement. The data for all velocities delineate a single trend and show larger stress drops for greater pre-failure loading displacement. Failure strength and post-slip stress levels converge with increasing velocity. Our data indicate that stress drop and post-seismic stress levels depend on loading rate and recurrence interval in a complex way.
| Original language | English (US) |
|---|---|
| Title of host publication | Geocomplexity and the Physics of Earthquakes, 2000 |
| Editors | Donald L. Turcotte, William Klein, John B. Rundle |
| Publisher | Blackwell Publishing Ltd |
| Pages | 187-198 |
| Number of pages | 12 |
| ISBN (Electronic) | 9781118668375 |
| ISBN (Print) | 9780875909783 |
| DOIs | |
| State | Published - Jan 1 2000 |
Publication series
| Name | Geophysical Monograph Series |
|---|---|
| Volume | 120 |
| ISSN (Print) | 0065-8448 |
| ISSN (Electronic) | 2328-8779 |
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All Science Journal Classification (ASJC) codes
- Geophysics
Cite this
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Effects of loading rate and normal stress on stress drop and stick-slip recurrence interval. / Karner, Stephen L.; Marone, Chris J.
Geocomplexity and the Physics of Earthquakes, 2000. ed. / Donald L. Turcotte; William Klein; John B. Rundle. Blackwell Publishing Ltd, 2000. p. 187-198 (Geophysical Monograph Series; Vol. 120).Research output: Chapter in Book/Report/Conference proceeding › Chapter
TY - CHAP
T1 - Effects of loading rate and normal stress on stress drop and stick-slip recurrence interval
AU - Karner, Stephen L.
AU - Marone, Chris J.
PY - 2000/1/1
Y1 - 2000/1/1
N2 - In this paper we report on investigations of frictional rcstrcngthcning during repetitive stick-slip on initially bare granite surfaces (nominal contact area 25 cm2). The tests were conducted in a double-direct shear apparatus at room-temperature and humidity. Normal stress was held constant, and shear was induced by controlling the velocity of a loading piston. Samples exhibited quasi-periodic stick-slip instabilities. Appreciable yielding and precursory creep occur prior to failure. Stress drop amplitudes range from 0.1 to 3.1 MPa (or 4-49% of the failure strength). We study the effects of loading rate (0.5 to 300 µm/s) and normal load (5 and 10 MPa) on stress drop and stick-slip recurrence interval. At a given loading rate, there is a positive correlation between stress drop and recurrence interval, indicating nealing rates of ~4 MPa per decade increase in recurrence time. However, the combined data from all velocities show a lower rate, suggesting an apparent healing rate of ~1 MPa per decade increase in recurrence time. We find a consistent scaling between different loading rates when stress drop is compared to inter-event loading displacement. The data for all velocities delineate a single trend and show larger stress drops for greater pre-failure loading displacement. Failure strength and post-slip stress levels converge with increasing velocity. Our data indicate that stress drop and post-seismic stress levels depend on loading rate and recurrence interval in a complex way.
AB - In this paper we report on investigations of frictional rcstrcngthcning during repetitive stick-slip on initially bare granite surfaces (nominal contact area 25 cm2). The tests were conducted in a double-direct shear apparatus at room-temperature and humidity. Normal stress was held constant, and shear was induced by controlling the velocity of a loading piston. Samples exhibited quasi-periodic stick-slip instabilities. Appreciable yielding and precursory creep occur prior to failure. Stress drop amplitudes range from 0.1 to 3.1 MPa (or 4-49% of the failure strength). We study the effects of loading rate (0.5 to 300 µm/s) and normal load (5 and 10 MPa) on stress drop and stick-slip recurrence interval. At a given loading rate, there is a positive correlation between stress drop and recurrence interval, indicating nealing rates of ~4 MPa per decade increase in recurrence time. However, the combined data from all velocities show a lower rate, suggesting an apparent healing rate of ~1 MPa per decade increase in recurrence time. We find a consistent scaling between different loading rates when stress drop is compared to inter-event loading displacement. The data for all velocities delineate a single trend and show larger stress drops for greater pre-failure loading displacement. Failure strength and post-slip stress levels converge with increasing velocity. Our data indicate that stress drop and post-seismic stress levels depend on loading rate and recurrence interval in a complex way.
UR - http://www.scopus.com/inward/record.url?scp=77955482926&partnerID=8YFLogxK
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U2 - 10.1029/GM120p0187
DO - 10.1029/GM120p0187
M3 - Chapter
AN - SCOPUS:77955482926
SN - 9780875909783
T3 - Geophysical Monograph Series
SP - 187
EP - 198
BT - Geocomplexity and the Physics of Earthquakes, 2000
A2 - Turcotte, Donald L.
A2 - Klein, William
A2 - Rundle, John B.
PB - Blackwell Publishing Ltd
ER -