Correlation between the seismicity parameters

Though the forecast and prediction of earthquakes is a commonly accepted difficult problem in science, thestep towards the exploration and knowledge of the generation and occurrence of earthquakes has never stopped. Ithas strong scientific exploration nature and great social efficacy in disaster reduction. For this reason, it has alwaysbeen the object and motivation pursued assiduously by earthquake researchers. It is beyond doubt that the study ofseismicity is still one of the important infor…     

Relationship between variations in the electric field’s vertical component in Lake Baikal and solar activity

Based on the data of deepwater measurements of the electric field’s vertical component in Lake Baikal, the relationship between electric field variations and those in background X-ray solar radiation has been revealed. A high correlation between these variations within periods of more than three months has been discovered.     

Relationship between earthquake and volcanic eruption inferred from historical records

Introduction From the records of Wudalianchi volcanic group eruption in 1720~1721 obtained from the Man ethnic group files of Heilongjiang General Yamen in Qing Dynasty (WU, 1998; CHEN, WU, 2003), we have discovered the eruption time, state, material and scale of Laoheishan and Hu-oshaoshan volcanoes, as well as numerous seismic records. These historical materials are discov-ered for the first time although the study on Wudalianchi volcanic group has a long history. These earthquakes co…     

Relationship between H_2 release and seis-micity on Xiadian Fault

ＲｅｌａｔｉｏｎｓｈｉｐｂｅｔｗｅｅｎＨ_２ｒｅｌｅａｓｅａｎｄｓｅｉｓ－ｍｉｃｉｔｙｏｎＸｉａｄｉａｎＦａｕｌｔＱＩＮＧ－ＷＵＧＡＯ（高清武）,ＮＩＬＩ（李霓）ＩｎｓｔｉｔｕｔｅｏｆＧｅｏｌｏｇｙ,ＣｈｉｎａＳｅｉｓｍｏｌｏｇｉｃａｌＢｕｒｅａｕ,...     

On correlation between seismic activities and focal mechanisms of subsequent strong earthquakes

Introduction Earthquakes are direct results from tectonic deformation and crustal movements, which usu- ally contain abundant information of crustal stress status and medium property in the deep lithosphere. Seismic activities might reflect accumulation and concentration of crustal stress in the seismogenic process. And different mechanisms of rock ruptures lead to different precursory phe- nomena prior to earthquakes (ZHANG, et al, 2001). Therefore, seismic activities before a strong earthq…     

A model of seismicity with fractal structures and a preliminary discussion on the relation between D and b value

ＡｍｏｄｅｌｏｆｓｅｉｓｍｉｃｉｔｙｗｉｔｈｆｒａｃｔａｌｓｔｒｕｃｔｕｒｅｓａｎｄａｐｒｅｌｉｍｉｎａｒｙｄｉｓｃｕｓｓｉｏｎｏｎｔｈｅｒｅｌａｔｉｏｂｅｔｗｅｅｎＤａｎｄｂｖａｌｕｅＨａｔ－ＫｕｎＪＩＡＮＧ（蒋海昆）ａｎｄＳｈｏｕ－ＺｈｏｎｇＤＩ...     

Research on the correlation between North China earthquake and global regional strong earthquakes

ＲｅｓｅａｒｃｈｏｎｔｈｅｃｏｒｒｅｌａｔｉｏｎｂｅｔｗｅｅｎＮｏｒｔｈＣｈｉｎａｅａｒｔｈｑｕａｋｅａｎｄｇｌｏｂａｌｒｅｇｉｏｎａｌｓｔｒｏｎｇｅａｒｔｈｑｕａｋｅｓ何淑韵，吴佳翼Ｓｈｕ－ＹｕｎＨＥａｎｄＪｉａ－ＹｉＷＵ（ＩｎｓｔｉｔｕｔｅｏｆＧ...     

The relation between solar activity and orientation of the solar wind electric field relative to the Earth’s magnetic moment

The relation of the Kp index of geomagnetic activity to the solar wind electric field (E _SW) and the projection of this field onto the geomagnetic dipole has been estimated. An analysis indicated that the southward component of the IMF vector (B _z < 0) is the main geoeffective parameter, as was repeatedly indicated by many researchers. The presence of this component in any combinations of the interplanetary medium parameters is responsible for a high correlation between such combinations and geomagnetic activity referred to by the authors of different studies. Precisely this field component also plays the main role in the relation between the Kp index and the relative orientation of E _SW and the Earth’ magnetic moment.     

Research on the relationship between Earth＇s variable rotation and global seismic activity

ＲｅｓｅａｒｃｈｏｎｔｈｅｒｅｌａｔｉｏｎｓｈｉｐｂｅｔｗｅｅｎＥａｒｔｈ＇ｓｖａｒｉａｂｌｅｒｏｔａｔｉｏｎａｎｄｇｌｏｂａｌｓｅｉｓｍｉｃ　ａｃｔｉｖｉｔｙＤａ－ＷｅｉＺＨＥＮＧａｎｄＹｏｎｇ－ＨｏｎｇＺＨＯＵ（郑大伟，周永宏）（Ｓｈａｎｇｈａｉ...     

Interrelation between seismicity parameters and delimiting potential seismic sources in a seismic statistical region and its influence on seismic risk estimation

In the paper, we have discovered the abnormal area distribution features of maximum variation values of ground motion parameter uncertainty with different probabilities of exceedance in 50 years within the range of 100°～120°E,29°～42°N for the purpose to solve the problem that abnormal areas of maximum variation values of ground motion parameter uncertainties emerge in a certain cities and towns caused by seismicity parameter uncertainty in a seismic statistical region in an inhomogeneous distribution model that considers tempo-spatial nonuniformity of seismic activity. And we have also approached the interrelation between the risk estimation uncertainty of a site caused by seismicity parameter uncertainty in a seismic statistical region and the delimitation of potential sources, as well as the reasons for forming abnormal areas. The results from the research indicate that the seismicity parameter uncertainty has unequal influence on the uncertainty of risk estimation at each site in a statistical region in the inhomogeneous distribution model, which relates to the scheme for delimiting potential sources. Abnormal areas of maximum variation values of ground motion parameter uncertainty often emerge in the potential sources of Mu≥8 (Mu is upper limit of a potential source) and their vicinity. However, this kind of influence is equal in the homogeneous distribution model. The uncertainty of risk estimation of each site depends on its seat. Generally speaking, the sites located in the middle part of a statistical region are only related to the seismicity parameter uncertainty of the region, while the sites situated in or near the juncture of two or three statistical regions might be subject to the synthetic influences of seismicity parameter uncertainties of several statistical regions.     

Primary component analysis method and reduction of seismicity parameters

Introduction Data mining (SHAO and YU, 2003) is a new kind of technique developed with database and artificial intelligence in recent years, which processes the data in the database to abstract the im- plied and pre-unknown, but potentially useful information and knowledge from large amounts of incomplete, noisy, blurring and stochastic data. For data mining, data purging is an important link beforehand that includes eliminating noise, making up lost domain, and deleting ineffective data, as…     

Simulation of the active and quiet periods of seismicity

ＳｉｍｕｌａｔｉｏｎｏｆｔｈｅａｃｔｉｖｅａｎｄｑｕｉｅｔｐｅｒｉｏｄｓｏｆｓｅｉｓｍｉｃｉｔｙＺＨＯＮＧ－ＸＭＮＨＵＡＮＧ（黄忠贤）（ＩｎｓｔｉｔｕｔｅｏｆＣｒｕｓｔａｌＤｙｎａｍｉｃｓ，ＳｔａｔｅＳｅｉｓｍｏｌｏｇｉｃａｌＢｕｒｅａｕ，Ｂｅｉｊｉ...     

Variations in the polar precipitation equatorward boundary during the interaction between the Earth’s magnetosphere and solar wind streams from isolated solar sources

The position of the auroral luminosity equatorward boundary during the interaction between the Earth’s magnetosphere and isolated solar wind streams from different solar sources has been statistically studied based on the ground and satellite observations of auroras. These studies continue the series of the works performed in order to develop the technique for predicting auroras based on the characteristics of the interplanetary medium and auroral disturbances. The dependences of the minimal position of the auroral luminosity equatorward boundary (Φ′) on the values of the azimuthal component of the interplanetary electric field (E _y ) and AL indices of magnetic activity, averaged over 6 and 24 h, are presented. The distribution limits for each type of isolated solar wind streams on the Φ′-E _y and Φ′-AL planes have been determined.     

Relationship between faults and generation of inland shallow earthquakes:enlighten-ment of the M=7.2

Ｒｅｌａｔｉｏｎｓｈｉｐｂｅｔｗｅｅｎｆａｕｌｔｓａｎｄｇｅｎｅｒａｔｉｏｎｏｆｉｎｌａｎｄｓｈａｌｌｏｗｅａｒｔｈｑｕａｋｅｓ：ｅｎｌｉｇｈｔｅｎ－ｍｅｎｔｏｆｔｈｅＭ＝７．２ｓｏｕｔｈｅｒｎＨｙｏｇｏｐｒｅｆｅｃ－ｔｕｒｅｅａｒｔｈｑｕａｋｅＴＯ...     

The Relationship between Multifractal and Entropy Properties of Seismic Noise in Kamchatka and Irregularity of the Earth’s Rotation

Izvestiya, Physics of the Solid Earth - Abstract—The connection between the properties of seismic noise continuously recorded by the network of 21&nbsp;broadband seismic stations in...     

Correlation between the Earth’s outer radiation belt dynamics and solar wind parameters at the solar minimum according to EMP instrument data onboard the CORONAS-Photon satellite

The study of variations in the electron flux in the outer Earth radiation belt (ERB) and their correlations with solar processes is one of the important problems in the experiment with the Electron-M-Peska instrument onboard the CORONAS-Photon solar observatory. Data on relativistic and subrelativistic electron fluxes obtained by the Electron-M-Peska in 2009 have been used to study the outer ERB dynamics at the solar minimum. Increases in outer ERB relativistic electron fluxes, observed at an height of 550 km after weak magnetic disturbances induced by high-velocity solar wind arriving to the Earth, have been analyzed. The geomagnetic disturbances induced by the high-velocity solar wind and that resulted in electron flux variations were insignificant: there were no considerable storms and substorms during that period; however, several polar ground-based stations observed an increase in wave activity. An assumption has been made that the wave activity caused the variations in relativistic electron fluxes.     

Temporal variations in the fractal properties of seismicity in the North Anatolian Fault Zone between 31°E and 41°E

We investigate the nature of temporal variations in the statistical properties of seismicity associated with the North Anatolian Fault Zone between longitudes 31°–41°E during the instrumental period 1900–1992. Temporal variations in the seismicb value and the fractal (correlation) dimensionD _c of earthquake epicenters are examined for earthquakes of magnitudeM _S 4.5, using sliding windows of 100 consecutive events.b varies temporally between 0.6 and 1.0, andD _c between 0.6 and 1.4, both representing significant fluctuations above the errors in measurement technique. A strong negative correlation (r=–0.85) is observed betweenb andD _c , consistent with previous observation of seismicity in Japan and southern California. Major events early in this century (M _S 7) are associated with lowb and highD _c , respectively consistent with greater stress intensity and greater spatial clustering of epicenters—both implying a greater degree of stress concentration at this time.     

Prediction of maximum magnitude and original time of reservoir induced seismicity

Introduction Prediction of RIS includes earlier stage prediction and seismic tendency prediction. In earlier stage, the prediction is to predict the possibility and maximum magnitude of RIS before reservoir are built up. It is made up on the basis of geological condition and the definite method and the statistical model method are usually used. The definite method by analogy with geological condi-tion is to analyze and sum up the main conditions of RIS. Using the main conditions compared w…