The article theoretically reveals the interior relations between the spectral amplitude of global surface wave phase velocity and earth structure's differentiability of lateral heterogeneity, analyzes the features of two kinds of different spectral amplitude, and provides some theoretical criteria for choosing suitable parameterization and prior smoothing condition.
By effective identification of S wave phase with DSS data and with the caclulation method of S wave splitting parameters, S wave data from Tai'an Xinzhou profile were calculated and analyzed. As a result, reliable evicence was obtained with respect to crustal medium anisotropy and anomaly of regional stress field orirentation in the region.
It is also found that if a continuous transition-region between the crust and the mantle is introduced, we can get a strong apparent head wave phase in synthetic seismogram and the amplitude of this phase increases with the thickness or velocity gradient of the transitional region.
The influences of relevant parameters such as wave height, wave steepness, relative depth as well as slope of breakwater upon envelope curve and relationship between wave phase and that of reversal stress are also discussed.
Shear wave phase SKS of 11 earthquakes, collected from 23 stations of Yunnan digital seismic network, is analyzed by fitting the theoretical transverse component with the observed one for determining the orientation and extent of polarization seismic anisotropy of upper mantle.
Based on the algorithm, the value of transient Reyleigh wave phase velocity is closer to true wave velocity, so the resolving rate and the definition of the phase velocity are improved.
It is shown that a gas stream increases the instability of the film and a counter-current gas flow has a greater effect on the wave phase velocity than a co-current flow.
The existence of discontinuities is attributable to the distortion of the internal-wave phase pattern in the shear flow and to the varying stratification and subsequent interaction of the waves with the appearing nonuniformities.
Allowance for the rotation-induced anisotropy in turbulent diffusion leads to an equatorward deviation of the wave phase velocity from the isorotational surface.
The radiation damping constant associated with the possible emission of electromagnetic radiation is determined in the range of Swihart wave phase velocities exceeding the speed of light.
Soliton wall superlattice charge-density-wave phase in a magnetic field
On the basis of experimental researches on normal reversal stress due to wave inside the protective armor of sloping breakwater, this paper presents an analysis of envelope curves of maximum reversal stress with the conclusion that the instability of the protective armor of sloping breakwater mostly occurs between breaker depth and striking point, where normal reversal stress of wave attains maximum value. The influences of relevant parameters such as wave height, wave steepness, relative depth as well as slope...
On the basis of experimental researches on normal reversal stress due to wave inside the protective armor of sloping breakwater, this paper presents an analysis of envelope curves of maximum reversal stress with the conclusion that the instability of the protective armor of sloping breakwater mostly occurs between breaker depth and striking point, where normal reversal stress of wave attains maximum value. The influences of relevant parameters such as wave height, wave steepness, relative depth as well as slope of breakwater upon envelope curve and relationship between wave phase and that of reversal stress are also discussed. Based upon the data taken in the laboratory, statistical method is used to deduce an empirical expression of envelope curve of reversal stresses and to give the extent of most disad vantageous loading on protective armor.
Using about 30000 long period seismic waveforms, which are associated with earthquakes M≥6.0 recorded by global digital seismic networks between 1980 and 1992, global Love and Rayleigh wave phase velocity variations in periods of 85s and 250s are obtained. All of waveforms are visually inspected in time and spectral domains, and the used phases are minor and major great circle phases Gl, R1, G2,and R2. Using the hybrid parameterization, in which final block inversion in higher regional resolution...
Using about 30000 long period seismic waveforms, which are associated with earthquakes M≥6.0 recorded by global digital seismic networks between 1980 and 1992, global Love and Rayleigh wave phase velocity variations in periods of 85s and 250s are obtained. All of waveforms are visually inspected in time and spectral domains, and the used phases are minor and major great circle phases Gl, R1, G2,and R2. Using the hybrid parameterization, in which final block inversion in higher regional resolution is embed in an aspherical reference model, and considering of the topography and crustal thickness variation, the inversions are performed with and without shallow layer corrections. Comparing with previous global phase velocity models, the l0ng wave length features are consistent both in magnitudes and variation patterns. The short period phase velocity variations are correlated with continental craton, middle cocean ridge, and tectonic activities,The correlation,however,decreases with period increases,And some oceanic hotspots are related to slow velocity anomalies.
In the study of crustal and upper mantle velocity structure with teleseismic surface wave data, the great circle path and plane wave assumptions of conventional surface wave tomography are no longer valid. By means of the joint inversion method for wave field and velocity structUre developed by Friederich and Wielandt we made a preliminary study on the laterally inhomogeneous distribution of Love wave phase velocities in southern Germany, using Love wave data recorded by the German Regional Seismograph...
In the study of crustal and upper mantle velocity structure with teleseismic surface wave data, the great circle path and plane wave assumptions of conventional surface wave tomography are no longer valid. By means of the joint inversion method for wave field and velocity structUre developed by Friederich and Wielandt we made a preliminary study on the laterally inhomogeneous distribution of Love wave phase velocities in southern Germany, using Love wave data recorded by the German Regional Seismograph Network. The main features of the resulted phase velocity map at various Periods are stable, do not change with the selection of data. The phase velocity of 30 seconds Love wave is mainly affected by the crustal thickness, the phase velocity map correlates well with the known Moho depth distribution. From 39 to 66 seconds the velocity maps change gradually with periods to a pattern controled by tectonic activities in the lower part of lithosphere. T'he phase velocity maps betWeen 75 and 113 seconds indicate clear low velocity zones in Rhine graben and other tectonically active areas. In the tectonically stable area in the northeastern part of study region high velocity PersistS from 20 to 113 seconds Period.
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