The main pattern of the crustal deformation is a clockwise rotation vortex structure and a differential slip along the boundary fault between different blocks.
Some earthquakes in recent years (such as Tangshan earthquake (1976, China), North Ridge earthquake (1994, USA), Kobe earthquake (1995, Japan)) did not occur in known faults; moreover, the detailed data of geology, earthquake, crust deformation, etc.
Polycrystalline quartz ribbons in high-grade metamorphic rocks from the Daqingshan region, are typical microfabrics of, and provide information for, deep crust deformation and metamorphism.
The images of main precursor mode have the characteristic of main shock-after shock type, which is agreement to the model of coupling movement between crust density and crust deformation (DD mode of coupling movement).
This paper presents a new device-a three dimensional reader measuring the fringe shift from the hologram. Measuring data can be obtained with accuracy by free rotation about the measured point of displacement, thereby can be read the angles of various directions of observation and the number of the fringe shift, with the result used as a computer input for obtaining the three cartesian components of displacement. This device is applied to a sphere undergoing radial deformation; the fringe counting results o...
In this paper, a dynamic adjustment method monitoring the horizontal deformation is suggested by the adjustment of observation equations with condition equations.The problems about the models of moving stations, types and numbers of condition equations, configuration and data defects, the way of calculation and accuracy estimation are discussed. Then a numerical example is given.This method is characterized by effectivelly utilization of all observational data, especially will give the best results for the ...