DOI: 10.1029/2004gl020781. Strain rate and temperature dependence of Omori law scaling constants of AE data: Implications for earthquake foreshock‐aftershock sequences

Strain rate and temperature dependence of Omori law scaling constants of AE data: Implications for earthquake foreshock‐aftershock sequences

10.1029/2004gl020781

Crossref journal-article

American Geophysical Union (AGU)

Geophysical Research Letters (13)

Abstract

Little is known about the temperature and strain rate dependence of acoustic emission AE activity (AE). Hence, we carried out a preliminary series of flow‐through triaxial compression tests on porous sandstones at different temperatures and strain rates. The AE data exhibits clear foreshock and aftershock sequences with respect to the dynamic failure of the test specimen. Significant AE activity starts less than 5 min before sample failure irrespective of the strain rate. The increase in the AE event rate is steeper and the foreshock exponent p′ is smaller in the slow strain rate tests. It could be the reason why there are no easily recognisable foreshock sequences for most individual earthquakes. The aftershock decay parameter p is a linear function of test temperature as it has also been inferred for natural seismicity. The seismic b‐value decreases systematically with increasing deformation rate suggesting a greater proportion of small cracks in the slow strain rate tests. Hence, the AE activity is a function of both strain rate and temperature.

Bibliography

Ojala, I. O., Main, I. G., & Ngwenya, B. T. (2004). Strain rate and temperature dependence of Omori law scaling constants of AE data: Implications for earthquake foreshockâaftershock sequences. Geophysical Research Letters, 31(24). Portico.

Authors 3

Ira O. Ojala (first)
Ian G. Main (additional)
Bryne T. Ngwenya (additional)

References 24 Referenced 57

{'key': 'e_1_2_7_2_1', 'first-page': '237', 'article-title': 'Maximum likelihood estimate of b in the formula log N = a − bm and its confidence limits', 'volume': '43', 'author': 'Aki K.', 'year': '1965', 'journal-title': 'Bull. Earthquake Res. Inst. Univ. Tokyo'} / Bull. Earthquake Res. Inst. Univ. Tokyo / Maximum likelihood estimate of b in the formula log N = a − bm and its confidence limits by Aki K. (1965)
10.1016/B978-0-12-066266-1.50010-7
10.1029/92JB01891
10.1029/2002JB001991
10.1029/JB092iB07p06215
10.1111/j.1365-246X.1987.tb00732.x
10.1111/j.1365-246X.1994.tb00923.x
10.1016/0148-9062(93)90041-B
10.1785/BSSA0670020247 / Bull. Seismol. Soc. Am. / Acoustic emission and creep in rock at high confining pressure and differential stress by Lockner D. (1977)
10.1038/363250a0
10.1046/j.1365-246x.2000.00136.x
10.1111/j.1365-246X.1991.tb00831.x
10.1016/0040-1951(90)90141-T
{'key': 'e_1_2_7_15_1', 'first-page': '125', 'article-title': 'Study of elastic shocks caused by the fracture of heterogeneous materials and its relation to earthquake phenomena', 'volume': '40', 'author': 'Mogi K.', 'year': '1962', 'journal-title': 'Bull. Earthquake Res. Inst. Univ. Tokyo'} / Bull. Earthquake Res. Inst. Univ. Tokyo / Study of elastic shocks caused by the fracture of heterogeneous materials and its relation to earthquake phenomena by Mogi K. (1962)
10.1016/0040-1951(67)90043-1
10.1029/2002JB002277
10.1029/2002JB002347
10.1016/0040-1951(82)90167-6
10.1029/JB073i004p01417
10.4294/jpe1952.43.1
10.1029/1999GL005425
10.1029/GL007i009p00637
10.1029/2001GL014369
10.1029/JB090iB08p06840

Dates

Type	When
Created	20 years, 8 months ago (Dec. 28, 2004, 6:27 p.m.)
Deposited	1 year, 10 months ago (Oct. 31, 2023, 12:46 p.m.)
Indexed	2 weeks, 2 days ago (Aug. 21, 2025, 2:10 p.m.)
Issued	20 years, 9 months ago (Dec. 1, 2004)
Published	20 years, 9 months ago (Dec. 1, 2004)
Published Online	20 years, 8 months ago (Dec. 29, 2004)
Published Print	20 years, 9 months ago (Dec. 1, 2004)

Funders 0

None

BibTeX

@article{Ojala_2004, title={Strain rate and temperature dependence of Omori law scaling constants of AE data: Implications for earthquake foreshock‐aftershock sequences}, volume={31}, ISSN={1944-8007}, url={http://dx.doi.org/10.1029/2004gl020781}, DOI={10.1029/2004gl020781}, number={24}, journal={Geophysical Research Letters}, publisher={American Geophysical Union (AGU)}, author={Ojala, Ira O. and Main, Ian G. and Ngwenya, Bryne T.}, year={2004}, month=dec }

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