181 Result(s)
within
Earth Sciences
Zhi-**a Yang
-
Article
Study of anomaly patterns of the ground tilt before two strong earthquakes
-
Article
Features of fractal dimension anomaly of radon content in underground water in North China before and after the 1976 Tangshan earthquake
Based on the fractal theory, proceeding from the observed data of the random content of underground water, the fractal dimension of the sequence of sudden changes of the radon content of 27 wells (springs) in ...
-
Article
Experimental studies of focal mechanism based on the dynamic process of energy release
Studies on the similarities between the energy release on the surface of the shape memory alloy and the strong seismic activities in China lead to the possibilities that the results obtained from the observati...
-
Article
Uncertainities in estimation of extrapolated annual occurrence rate of earthquakes using logical tree
The logical tree methods are used for evaluate quantitatively relationship between frequency and magnitude, and deduce uncertainties of annual occurrence rate of earthquakes in the periods of lower magnitude e...
-
Article
Identification method of weak seismic phases on the basis of wavelet packet transform
This paper describes a sort of new method identifying seismic phase by the name of wavelet packet transform. Perfectness and development of the wavelet packet transform is based upon the idea of its multiscale...
-
Article
The empirical relationships between M s, m b and M L for China and vicinity
Data from 753 earthquakes are used to determine a relationship between surface-wave magnitude (M s) and bodywave magnitude (m b), and from 541 earthquakes to determine a relationsh...
-
Article
Study on the crust-mantle structure in the central and southern parts of Shanxi
Another comparative interpretation was conducted with respect to the data from 5 DSS profiles in the central and southern parts of Shanxi, leading to the conclusion that in Linxian, Linfen and **ngtai earthqua...
-
Article
Anomalies of geophysical field in deep crust and earthquakes in Central-South Shanxi
Comprehensive studies on the crustal structures, the anomalies of geophysical field and the seismicity in Central-South Shanxi are conducted. The research results show that there are deep tectonic background f...
-
Article
Differences between magnitudes of Taiwan earthquakes from catalogs of Taiwan and Bei**g
Taiwan is a region with very high seismicity where hundreds of earthquakes with M≥5 occurred per year and more than 40 with M≥7 since 1900 due to it is located at the boundary of collision between Eurasian and th...
-
Article
Gravity changes and surface deformations due to faults with different geometry
Based on the formulae of the gravity changes and surface deformations raised by the dislocation of a point source, the gravity changes and deformations caused by the dislocations of fault with arbitrary geomet...
-
Article
Study on the method for comprehensive discrimination of small earthquakes
In the paper, we apply the theory of modern digital signal processing to analysis 3-component digital seismic data recorded in Datong area of Shanxi Province by digital seismographs developed by the Institute ...
-
Article
Relocation and seismogenic structure of the 1998 Zhangbei-Shangyi earthquake sequence
On January 10, 1998, an earthquake of M L=6.2 occurred in the border region between the Zhangbei County and Shangyi County of Hebei Province. This earthquake has been the most significant ...
-
Article
Earthquake relocation and 3-dimensional crustal structure of P-wave velocity in cen-tral-western China
A simultaneous inversion of earthquake relocation and three-dimensional crustal structure of P-wave velocity in central-western China (21°N∼36°N, 98°E∼112°E) were performed in this paper. The crustal P-wave ve...
-
Article
Preliminary study on characteristics of earthquake precursor of earth resistivity anisotropy degree in East China
-
Article
Relocation of the 1998 Zhangbei-Shangyi earthquake sequence using the double difference earthquake location algorithm
On January 10, 1998, at 11h50min Bei**g Time (03h50min UTC), an earthquake ofM L=6.2 occurred in the border region between the Zhangbei County and Shangyi County of Hebei Province. This earthquak...
-
Article
Upper mantle convection driving by density anomaly and a test model
A mathematic-physical convection model in upper mantle is established in this paper. This model is in a three dimensional frame. Assume that the density anomalies, which are mapped from the seismic tomography ...
-
Article
Preliminary study on coseismic step-like changes of water-level in the Dazhai well, Simao city, Yunnan Province
-
Article
Correction to the crustal thickness of the northwestern China using the data of seismic tomography
Considering the influence of the density anomaly of the crust and upper mantle on the gravity, we provide a new arithmetic to invert the crustal thickness. Applying the result of seismic tomography, we calcula...
-
Article
Weathering mechanism of the Cretaceous argillaceous siltstone caverns, Longyou, China
The Longyou caverns in the Zhejiang province of China were hand dug more than two thousand years ago. Five of these caverns were drained in 1992 and are now a major tourist attraction. Brick red argillaceous s...
-
Article
A recent paleoearthquake on Qingfengling seismic fault of Tanlu fault zone
