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  • 1
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    In:  J. Geophys. Res., New York, August, vol. 76, no. 3-4, pp. 7088-7106, pp. 1610, (ISSN: 1340-4202)
    Publication Date: 1971
    Keywords: Stress ; Induced seismicity ; Dislocation ; JGR
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  • 2
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    In:  Bull. Seism. Soc. Am., New York, August, vol. 61, no. 3-4, pp. 1453-1466, pp. 1610, (ISSN: 1340-4202)
    Publication Date: 1971
    Keywords: Stress ; Induced seismicity ; Dislocation ; BSSA
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  • 3
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    In:  Eos Trans. AGU, New York, August, vol. 86, no. 45, pp. 447, pp. 1610, (ISSN: 1340-4202)
    Publication Date: 2005
    Description: On the third day of a recent AGU Chapman Conference, held in Portland, Maine, near the Two Lights fault zones and the Fort Foster brittle zone, conference participants spent the gray June day scrambling over rocky ledges above the crashing surf along the coast of the Atlantic Ocean. With field trip leader Mark Swanson, who with his students has studied the area in detail over the past 20 years, participants examined evidence of ancient earthquakes from about 300 million years ago when these rocks were 8 to 10 kilometers deep. This evidence included pseudotachylytes - glass generated by heating during fault slip at midcrustal depths
    Keywords: Seismology ; Energy (of earthquakes) ; Friction ; Fracture ; Fault zone ; Physical properties of rocks ; Proceedings of a conference ; 7209 ; Seismology: ; Earthquake ; dynamics ; 7215 ; Earthquake ; source ; observations ; 8004 ; Structural ; Geology: ; Dynamics ; and ; mechanics ; of ; faulting
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  • 4
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    In:  Bull. Seism. Soc. Am., New York, August, vol. 95, no. 1, pp. 31-47, pp. 1610, (ISSN: 1340-4202)
    Publication Date: 2005
    Keywords: Earthquake hazard ; Attenuation ; Moment tensor ; Seismicity ; Induced seismicity ; dam ; Modelling ; USA ; BSSA
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  • 5
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    In:  Bull. Seism. Soc. Am., Amsterdam, Elsevier Scientific Publishing Company, vol. 95, no. 1, pp. 18-30, pp. 1390
    Publication Date: 2005
    Keywords: Earthquake hazard ; Attenuation ; Moment tensor ; Seismicity ; Induced seismicity ; USA ; dam ; BSSA
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  • 6
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    In:  Bull. Seism. Soc. Am., Tokyo, Terra Scientific Publishing Company, vol. 95, no. 1, pp. 48-57, pp. B08404, (ISBN: 0534351875, 2nd edition)
    Publication Date: 2005
    Keywords: Earthquake hazard ; Moment tensor ; Inversion ; Seismicity ; Induced seismicity ; dam ; Modelling ; USA ; BSSA
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  • 7
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    In:  J. Geophys. Res., Tokyo, Terra Scientific Publishing Company, vol. 111, no. B3, pp. 1428-1446, pp. B03312, (ISBN: 0534351875, 2nd edition)
    Publication Date: 2006
    Keywords: Source parameters ; Stress drop ; Physical properties of rocks ; Rock mechanics ; Fracture ; Source ; Northridge ; Landers ; Kobe ; Earthquake ; JGR ; rupture ; mechanism ; source ; parameters ; apparent ; stress ; 1242 ; Geodesy ; and ; Gravity: ; Seismic ; cycle ; related ; deformations ; (6924, ; 7209, ; 7223, ; 7230) ; 1240 ; Satellite ; geodesy: ; results ; (6929, ; 7215, ; 7230, ; 7240)
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  • 8
    Publication Date: 2012-03-03
    Description: Analytical results for parameters, such as static stress drop, for stick-slip friction experiments, with arbitrary input parameters, can be determined by solving an energy-balance equation. These results can then be related to a given earthquake based on its seismic moment and the maximum slip within its rupture zone, assuming that the rupture process entails the same physics as stick-slip friction. This analysis yields overshoots and ratios of apparent stress to static stress drop of about 0.25. The inferred earthquake source parameters static stress drop, apparent stress, slip rate, and radiated energy are robust inasmuch as they are largely independent of the experimental parameters used in their estimation. Instead, these earthquake parameters depend on C, the ratio of maximum slip to the cube root of the seismic moment. C is controlled by the normal stress applied to the rupture plane and the difference between the static and dynamic coefficients of friction. Estimating yield stress and seismic efficiency using the same procedure is only possible when the actual static and dynamic coefficients of friction are known within the earthquake rupture zone.
    Print ISSN: 0094-8276
    Electronic ISSN: 1944-8007
    Topics: Geosciences , Physics
    Published by Wiley on behalf of American Geophysical Union (AGU).
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  • 9
    Publication Date: 2011-08-24
    Description: By averaging the spectra of events within two episodes of tremor (on Jan. 21 and 24, 2005) across the 12 stations of UPSAR, we improved the S/N sufficiently to define source spectra. Analysis of eleven impulsive events revealed attenuation-corrected spectra of displacement similar to those of earthquakes, with a low-frequency plateau, a corner frequency, and a high frequency decay proportional to f−2. Seismic moments, M0, estimated from these spectra range from about 3 to 10 × 1011 N-m or moment magnitudes in the range 1.6 to 1.9. The corner frequencies range from 2.6 to 7.2 Hz and, if interpreted in the same way as for earthquakes, indicate low stress drops that vary from 0.001 to 0.04 MPa. Seismic energies, estimated from the ground motion spectra, vary from 0.2 × 105 to 4.4 × 105 J, or apparent stresses in the range 0.002 to 0.02 MPa. The low stress parameters are consistent with a weak fault zone in the lower crust at the depth of tremor. In contrast, the same analysis on a micro-earthquake, located near Cholame (depth = 10.3 km), revealed a stress drop of 0.5 MPa and an apparent stress of 0.02 MPa. Residual spectra from ω−2 model fits to the displacement spectra of the non-volcanic tremor events show peaks near 4 Hz that are not apparent in the spectra for the microearthquake nor for the spectrum of earth noise. These spectral peaks may indicate that tremor entails more than shear failure reminiscent of mechanisms, possibly entailing fluid flow, associated with volcanic tremor or deep volcanic earthquakes.
    Print ISSN: 0094-8276
    Electronic ISSN: 1944-8007
    Topics: Geosciences , Physics
    Published by Wiley on behalf of American Geophysical Union (AGU).
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  • 10
    Publication Date: 2015-02-24
    Description: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉McGarr, A -- Bekins, B -- Burkardt, N -- Dewey, J -- Earle, P -- Ellsworth, W -- Ge, S -- Hickman, S -- Holland, A -- Majer, E -- Rubinstein, J -- Sheehan, A -- New York, N.Y. -- Science. 2015 Feb 20;347(6224):830-1. doi: 10.1126/science.aaa0494.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉U.S. Geological Survey (USGS), Earthquake Science Center, Menlo Park, CA 94025, USA. mcgarr@usgs.gov. ; USGS, National Water Quality Assessment Program, Menlo Park, CA 94025, USA. ; USGS, Powell Center, Fort Collins, CO 80526, USA. ; USGS, Geologic Hazards Center, Golden, CO 80225, USA. ; U.S. Geological Survey (USGS), Earthquake Science Center, Menlo Park, CA 94025, USA. ; University of Colorado at Boulder, Boulder, CO 80302, USA. ; Oklahoma Geological Survey, Norman, OK 73069, USA. ; Lawrence Berkeley National Laboratory, Berkeley, CA, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/25700505" target="_blank"〉PubMed〈/a〉
    Keywords: Disasters/*prevention & control/*statistics & numerical data ; Earthquakes/*statistics & numerical data ; Proportional Hazards Models ; Safety Management/methods ; United States ; Waste Disposal, Fluid/*methods
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
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