15 Result(s)
within
Shi-Rong Mei
Geophysics/Geodesy
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Article
3-D rheologic model of earthquake preparation (I) — Displacement field
Based on the three-dimensional ela stic inclusion model proposed by Dobrovolskii, we developed a three-dimensional rheologic inclusion model and theory to study the earthquake preparation process. By using cor...
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Article
An experimental study of the dynamic features of shadow areas of caustics in response to loading/unloading fracture
Using a plexiglass sample and by means of real-time holographic interferometry and shadow optical method of caustics, the different features of dynamic variation in stress (strain) field, plastic area and nucl...
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Article
Physical meaning and prediction efficiency of the load/unload response ratio of rocks in strain-weakening phase before failure
Rock experiment results indicate that the load/unload response ratio (LURR) of rocks expressed via strain energy may have singular or negative value after the stress in the rock reaches its maximum before rock...
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Article
Theoretical analysis of the spatio-temporal evolution of the bulk-strain field based on a rheologic inclusion model
Based on the theoretical expression of the three-dimension rheologic inclusion model, we analyze in detail the spatio-temporal changes on the ground of the bulk-strain produced by a spherical rheologic inclusi...
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Article
Periodic spectral characteristics of seismicity before strong earthquakes and their application
Periodic spectral characteristics of earthquake activity in the seismic strengthening areas of 24 earthquakes with M≥6.0 are studied by the maximum entropy spectral method whose superiority is tested. Then the fo...
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Article
On seismic strengthening area before strong and great shocks and its mechanism
By systematically studying seismic strengthening areas before 85 earthquakes with M≥6.0 in China, some results have been extracted. (1) Earthquake active strengthening area exists universally before strong shock ...
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Article
Relationship between the earthquake sequences of Tangshan and **ngtai and the three dimensional velocity structure
In this paper, based on the results of tomographic image of Tangshan and **ngtai areas, the relations between the characteristics of the two strong earthquake sequences and their three-dimensional velocity str...
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Article
Burst strain disturbance — A new test study on fracture precursor
A multi-functional high-frequency seismometer, a new instrumental system, is used for recording multi-point strain variations of rock samples in the process of fracture development. The results indicate that s...
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Article
Experimental studies on the evolution process of microcrack patterns in concrete samples containing hard inclusions
Under biaxial pressure, the microcrack patterns of concrete samples with hard inclusion are as followings: Microcracks generate around the sample at the early pressured period, and gap is formed in the middle ...
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Article
An experimental study on fractural features of concrete samples containing hard inclusion
The final fractural forms and variation status of hard inclusion samples under biaxial compression have been primarily studied in this paper. The lateral fractural forms of samples are mainly compressive-shear...
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Article
Maximum entropy spectral characteristics of seismic activity for great earthquakes in China
The maximum entropy spectral characteristics of seismicity in the seismic enhanced region of 11 great earthquakes is analysed in this paper to seek the difference of seismic period spectral structure between t...
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Article
Patterns and regularity of ring distribution of seismic activity before great earthquakes in China
A systematic study on “ring phenomena” frequently occurring before great earthquakes has made in this paper, which has analyzed the features of ring distributions before 16 great earthquakes and part of large ...
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Article
On the physical model of earthquake precursor fields and the mechanism of precursors’ time-space distribution (III) — anomalies of seismicity and crustal deformation and their mechanisms when a strong earthquake is in preparation
By studying the seismicity pattern before 37 earthquakes withM⩾6.0 in North China and the pattern of crustal deformation in the Capital Area from 1954 to 1992, some abnormal characteristics of these patterns befo...
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Article
On the physical model of earthquake precursor fields and the mechanism of precursors′ time-space distribution (II) — How do the stress and strain fields evolve while a strong earthquake is in preparation and how does the evolution affect the seismicity and earthquake precursors?
In this paper, the stress concentration process and the time-space distribution of stress when earthquakes are in preparation in one or more earthquake-generating bodies in a tectonic block have been analyzed ...
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Article
On the physical model of earthquake precursor fields and the mechanism of precursors’ time-space distribution — origin and evidences of the strong body earthquake-generating model
According to the requirement of the project “Establishment of the Physical Model of Earthquake Precursor Fields”, this paper elucidates the train of thinking for research on the project and some scientific pro...
