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Radulian, Mendeley M Data) - One of the best experts on this subject based on the ideXlab platform.
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REFMC Catalogue
2020Co-Authors: Radulian, Mendeley M Data)Abstract:This focal Mechanism catalogue (REFMC) was compiled by Mircea Radulian, Andrei Bălă and Dragoș Toma-Dănilă from the National Institute for Earth Physics (INFP), Romania (http://www.infp.ro/) and comprises of Earthquakes in Romania, in the 1929 - 2012 period, for which we were able to compute or retrieve focal Mechanism parameters. If you use this catalogue in your work, cite it as follows: 1. Radulian M., Bala A., Popescu E., Toma-Danila D. (2018) Earthquake Mechanism and characterization of seismogenic zones in south-eastern part of Romania. Annals of Geophysics, 61(1), SE108. 2. Radulian M., Bala A., Ardeleanu L., Toma-Danila D., Petrescu L., Popescu E. (2019) Revised catalogue of Earthquake Mechanisms for the events occurred in Romania until the end of twentieth century: REFMC. Acta Geodaetica et Geophysica 54(1):3-18
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REFMC Catalogue
2020Co-Authors: Radulian, Mendeley M Data)Abstract:This focal Mechanism catalogue (REFMC) was compiled by Mircea Radulian, Andrei Bălă and Dragoș Toma-Dănilă from the National Institute for Earth Physics (INFP), Romania (http://www.infp.ro/) and comprises of Earthquakes in Romania, in the 1929 - 2012 period, for which we were able to compute or retrieve focal Mechanism parameters. If you use this catalogue in your work, beside the Mendeley Data citations please provide references to one of the following articles: 1. Radulian M., Bala A., Popescu E., Toma-Danila D. (2018) Earthquake Mechanism and characterization of seismogenic zones in south-eastern part of Romania. Annals of Geophysics, 61(1), SE108. 2. Radulian M., Bala A., Ardeleanu L., Toma-Danila D., Petrescu L., Popescu E. (2019) Revised catalogue of Earthquake Mechanisms for the events occurred in Romania until the end of twentieth century: REFMC. Acta Geodaetica et Geophysica 54(1):3-18
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REFMC 1929 - 2012 (Romanian Earthquake Focal Mechanism Catalogue)
2020Co-Authors: Radulian, Mendeley M Data)Abstract:REFMC 1929 - 2012 (Romanian Earthquake Focal Mechanism Catalogue) was compiled by Mircea Radulian, Andrei Bălă and Dragoș Toma-Dănilă from the National Institute for Earth Physics (INFP), Romania (http://www.infp.ro/) and comprises of Earthquakes in Romania, in the 1929 - 2012 period, for which we were able to compute or retrieve focal Mechanism parameters. The catalogue divides Earthquakes into two categories: crustal Earthquakes (h < 50 km) and intermediate-depth Earthquakes (h ≥ 50 km, all in the Vrancea area). Information regarding the catalogue was published in two separate papers which we invite you to read and cite: 1. Radulian M., Bala A., Popescu E., Toma-Danila D. (2018) Earthquake Mechanism and characterization of seismogenic zones in south-eastern part of Romania. Annals of Geophysics, 61(1), SE108. 2. Radulian M., Bala A., Ardeleanu L., Toma-Danila D., Petrescu L., Popescu E. (2019) Revised catalogue of Earthquake Mechanisms for the events occurred in Romania until the end of twentieth century: REFMC. Acta Geodaetica et Geophysica, 54, 1, 3-18. If you download and use this catalogue in your work, beside the 2 citation given, please provide the reference of this complete catalogue presented here: - Radulian, Mircea; Bala, Andrei; Toma-Danila, Dragos (2020), “REFMC 1929 2012 (Romanian Earthquake Focal Mechanism Catalogue) ”, Mendeley Data, V3, doi: 10.17632/mykkx4gygy.
Michael L Blanpied - One of the best experts on this subject based on the ideXlab platform.
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faulting friction and Earthquake mechanics
1994Co-Authors: Chris Marone, Michael L BlanpiedAbstract:Part 1 Fault mechanics, rupture processes and fracture - theory and observations: ductile creep and compaction - a Mechanism for transiently increasing fluid pressure in mostly sealed fault zones, N.H. Sleep and M.L. Blanpied grain and molecular controls on the ductile properties of mostly seismic faults at low-temperature hydrothermal conditions, N.H. Sleep simulation of the frictional stick-slip instability, P. Mora and D. Place Earthquake rupture complexity due to dynamic nucleation and interaction of subsidiary faults, T. Yamashita and Y. Umeda Mechanisms of brittle fracture of rock with pre-existing cracks in compression, L.N. Germanovich et al the role of the chemical environment in frictional deformation - stress corrosion cracking and comminution, J. Dunning et al. Part 2 Faulting and fault zones - field observations: petrophysical characteristics of faults in granular rock, M. Antonellini particle size distribution of cataclastic fault materials from Southern California - a 3-D study, L.-J. An and C.G. Sammis microstructural analysis of faulting in quartzite, Assynt, NW Scotland - implications for fault zone evolution, R.J. Knipe and G.E. Lloyd interaction of cataclasis and pressure solution in a low-temperature carbonate shear zone, J. Hadizadeh. Part 3 Rock friction and shear zone mechanics - laboratory studies: direct observation of frictional contacts - new insights for state-dependant properties, J.H. Dieterich and B.D. Kilgore micromechanics of the velocity and normal stress dependance of rock friction, W. Wang and C.H. Scholz the frictional behaviour of lizardite and antigorite serpentines - experiments, constitutive models and implications for natural faults, L.A. Reinen et al scaling of rock friction constitutive parameters - the effects of surface roughness and cumulative offset on friction of gabbro, C. Marone and S.J.D. Cox development of shear localization in simulated quartz gouge - effect of cumulative slip and gouge particle size, Y. Gu and T.-F. Wong laboratory measurement of compaction-induced permeability change inporous rocks - implications for the generation and maintenance of pore pressure excess in the crust, C. David et al Earthquake Mechanism and predictability shown by a laboratory fault, C.-Y. King a thermo-plastic constitutive law for brittle-plastic behaviour of rocks at high temperatures, T. Hueckel et al.
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an Earthquake Mechanism based on rapid sealing of faults
Nature, 1992Co-Authors: Michael L Blanpied, David A Lockner, J D ByerleeAbstract:RECENT seismological, heat flow and stress measurements in active fault zones such as the San Andreas have led to the suggestion1,2 that such zones can be relatively weak. One explanation for this may be the presence of overpressured fluids along the fault3–5, which would reduce the shear stress required for sliding by partially 'floating' the rock. Although several Mechanisms have been proposed for overpressurizing fault fluids3,4,6,7, we recall that 'pressure seals' are known to form in both sedimentary8 and igneous9 rocks by the redistribution of materials in solution; the formation of such a seal along the boundaries of a fault will prevent the communication of fluids between the porous, deforming fault zone and the surrounding country rock. Compaction of fault gouge, under hydrostatic loading and/or during shear, elevates pore pressure in the sealed fault and allows sliding at low shear stress. We report the results of laboratory sliding experiments on granite, which demonstrate that the sliding resistance of faults can be significantly decreased by sealing and compaction. The weakening that results from shear-induced compaction can be rapid, and may provide an instability Mechanism for Earthquakes.
J D Byerlee - One of the best experts on this subject based on the ideXlab platform.
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an Earthquake Mechanism based on rapid sealing of faults
Nature, 1992Co-Authors: Michael L Blanpied, David A Lockner, J D ByerleeAbstract:RECENT seismological, heat flow and stress measurements in active fault zones such as the San Andreas have led to the suggestion1,2 that such zones can be relatively weak. One explanation for this may be the presence of overpressured fluids along the fault3–5, which would reduce the shear stress required for sliding by partially 'floating' the rock. Although several Mechanisms have been proposed for overpressurizing fault fluids3,4,6,7, we recall that 'pressure seals' are known to form in both sedimentary8 and igneous9 rocks by the redistribution of materials in solution; the formation of such a seal along the boundaries of a fault will prevent the communication of fluids between the porous, deforming fault zone and the surrounding country rock. Compaction of fault gouge, under hydrostatic loading and/or during shear, elevates pore pressure in the sealed fault and allows sliding at low shear stress. We report the results of laboratory sliding experiments on granite, which demonstrate that the sliding resistance of faults can be significantly decreased by sealing and compaction. The weakening that results from shear-induced compaction can be rapid, and may provide an instability Mechanism for Earthquakes.
Fichtner Andreas - One of the best experts on this subject based on the ideXlab platform.
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Centroid moment tensor catalogue using a 3-D continental scale Earth model: Application to Earthquakes in Papua New Guinea and the Solomon Islands
'Wiley', 2019Co-Authors: Hejrani Babak, Tkalčić Hrvoje, Fichtner AndreasAbstract:Although both Earthquake Mechanism and 3-D Earth structure contribute to the seismic wavefield, the latter is usually assumed to be layered in source studies, which may limit the quality of the source estimate. To overcome this limitation, we implement a method that takes advantage of a 3-D heterogeneous Earth model, recently developed for the Australasian region. We calculate centroid moment tensors (CMTs) for Earthquakes in Papua New Guinea (PNG) and the Solomon Islands. Our method is based on a library of Green's functions for each source-station pair for selected Geoscience Australia and Global Seismic Network stations in the region, and distributed on a 3-D grid covering the seismicity down to 50 km depth. For the calculation of Green's functions, we utilize a spectral-element method for the solution of the seismic wave equation. Seismic moment tensors were calculated using least squares inversion, and the 3-D location of the centroid is found by grid search. Through several synthetic tests, we confirm a trade-off between the location and the correct input moment tensor components when using a 1-D Earth model to invert synthetics produced in a 3-D heterogeneous Earth. Our CMT catalogue for PNG in comparison to the global CMT shows a meaningful increase in the double-couple percentage (up to 70%). Another significant difference that we observe is in the Mechanism of events with depth shallower then 15 km and Mw < 6, which contributes to accurate tectonic interpretation of the region
Michael W Hamburger - One of the best experts on this subject based on the ideXlab platform.
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Earthquake focal Mechanisms deformation state and seismotectonics of the pamir tien shan region central asia
Journal of Geophysical Research, 1995Co-Authors: Albert A Lukk, Sergei L Yunga, Vladimir I Shevchenko, Michael W HamburgerAbstract:This paper presents a review of the seismotectonics of the Pamir-Tien Shan collision zone in the Garm region, Tajikistan, based on geological structure, seismicity, and focal Mechanism solutions. The region is dominated by horizontal compression, manifested by imbricate, low-angle thrust faults that separate the upper crust into a series of tectonic sheets. These thrust systems verge northward from the Tajik Depression toward the southern Tien Shan and southward toward the northern Pamir. The pattern of seismicity across the region suggests that similar low-angle thrust faults exist within the crystalline basement as well. In order to reconstruct the present-day stress-strain state of the region, we used data from over 15,000 Earthquake focal Mechanism solutions for small Earthquakes (M ≥ 1.0) gathered over the 27-year period, 1963–1989. The method of reconstruction of the seismotectonic deformation (STD) field involves dividing the data set into small spatial windows and summing the individual focal Mechanism solutions to form an average Earthquake Mechanism tensor for each cell. The STD state of that cell can then be represented by the orientation of the principal axes of compression and tension, the intensity (or relative uniformity) of the average Mechanism, and the Lode-Nadai coefficient, which defines the relation between the magnitudes of the principal strain components. We observe throughout the study area a general predominance of subhorizontal compression, manifested in a mixture of thrust and strike-slip deformation; normal-fault deformation is observed in only two small portions of the study area. The orientation of principal compression varies from nearly N-S in the northern Pamir and the southern Tien Shan to NW-SE in the Peter the First Range. In general, the STD field has a clearly developed “mosaic” structure, defined by spatial groupings of nearly uniform orientations of compression and tension axes. The boundaries of these groups cannot in most cases be directly correlated with known geological contacts. The STD structure also shows some variation with depth, with more or less uniform STD orientation in the upper crust (0–14 km depth), changing significantly at greater depths. Examination of various subsets of the focal Mechanism catalog shows the spatial structure of the STD field to be largely stable with respect to both time and magnitude. The reliability of the reconstructed STD field was verified using three approaches: (1) comparison of individual focal Mechanism determinations for a large subset of the data using both Soviet and U.S. algorithms, (2) comparison of STD reconstruction results using the two independent focal Mechanism catalogs, and (3) examination of the effect of spatial sampling on the results. The dominance of generally north oriented subhorizontal compression is interpreted to be primarily the result of convergence between the Pamir and Tien Shan ranges, in turn caused by the ongoing collision of India and Eurasia.