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Argument on the magnitude-frequency relation

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Acta Seismologica Sinica(English Edition) 2002年第2期15卷 187-197页

作者：陈时军王丽凤马丽张红军 seismological bureau of Shandong Province Ji'nan 250014 China Institute of Geology China Seismological Bureau Beijing 100011 China Center for Analysis and Prediction China Seismological Bureau Beijing 100036 China The Public Service bureau of Ji(nan city Shandong Province Ji'nan 250021 China

The complexity of seismicity and the relation of magnitude and frequency are discussed in this paper on the basis of nonlinear dynamics and multifractal theory. We argue that seismic active systems normally have multifractal characteristics, either for the spatial-temporal distribution or the intensity distribution of events. In the view of multifractal theory the nonlinear characteristics of the magnitude-frequency relation are discussed and the formulation is revised. Also, one example of the variance of bq estimated based on the recent New Zealand catalogue is enumerated.

关键词： the relation of magnitude and frequency multifractal analysis nonlinear characteristics

Information system for emergence decision on the protection against earthquake and disaster reduction in Shanghai city──Application of GIS

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Acta Seismologica Sinica(English Edition) 2000年第4期13卷 454-465页

作者：宋俊高朱元清火恩杰严大华杨挺 1. seismological bureau of Shanghai 200062 Shanghai China

For meeting the need of rapid development of economy in Shanghai and the protection against earthquake and disaster reduction in the mega city, it is necessary to build a information system for emergence decision on the protection against earthquake and disaster reduction in the city. In this paper, GIS is applied to 'the information system for emergence decision on the protection against earthquake and disaster reduction in Shanghai city (Baoshan experiment region)'. We introduce to the structure and effect of each functional module in this information system. This information system consists of 7 functional modules:background information of seismology and geology, subsystem for rapid evaluation of damage loss from earthquake, subsystem for the decisive information on earthquake emergence, information query, maintenance and management of system, help, quit. The key parts of this information system are the subsystem for rapid evaluation of damage loss from earthquake and the subsystem for the decisive information on earthquake emergence. Also, this paper introduces to the application of technology of color infra-red aerial photograph remote sensing to this information system.

关键词： Geographical Information System (GIS) protection against earthquake and disaster reduction evaluation of earthquake damage loss emergence decision

Mineral chemistry and isotope geochemistry of pyrite from the Heilangou gold deposit, Jiaodong Peninsula, Eastern China

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Geoscience Frontiers 2014年第2期5卷 205-213页

作者： Yutong Yan Na Zhang Shengrong Li Yongsheng Li Faculty of city and Environmental Science Xinyang Normal University State Key Laboratory of Geological Processes and Mineral Resources China University of Geosciences (Beijing) Heilongjiang seismological bureau

The Heilangou gold deposit is located in the northern QixiaePenglai gold belt, which is one amongst the three large gold belts in the eastern Shandong Province （Jiaodong Peninsula）. The ore body has formed within the Guojialing granite. In this study, we report the mineral chemistry of pyrite, as well as the S, Pb, and HeO isotope data of the Heilangou gold deposit. The chemical composition of pyrite in the Heilangou gold deposit indicates that the associated gold deposit is a typical magmatic hydrothermal one. The geochemical signatures and crystal structure of pyrite show that the ore-forming materials have been derived from the crust. The S isotope data of the pyrites from Heilangou show an overall range from 5.5 to 7.8＆amp;and an average of 6.7＆amp;. The S isotope data in this deposit are similar to those from the deposits in the Jiaodong gold belt. The Pb and S isotope variations are small in the Heilangou gold deposit. The 206Pb/204Pb, 207Pb/204Pb and 208Pb/204Pb ratios are 17.4653e17.5958, 15.5105e15.5746 and 38.0749e38.4361, respec-tively. These data plot between the lower crust and the orogenic belt. The Pb isotope data in the Heilangou gold deposit are similar to those in the Linglong gold deposit. From the Qixia gold area （the Liukou and Majiayao gold deposits） to the MupingeRushan gold belt （Rushan gold deposit） to the ZhaoeYe gold belt （the Linglong, Sanshandao and Jiaojia gold deposits）, the 206Pb/204Pb ratios progressively increase. The DeO isotope data obtained from quartz separates suggest that the ore-forming fluid was similar to a mixture of magmatic and meteoric waters. These results suggest that the ore-forming elements were primarily from source fluids derived from the lower crust.

关键词： Heilangou gold deposits Pyrite Isotope geochemistry Genesis

The Two-dimensional Time Coordinate System and Time Prediction Research of M≥6.7 Strong Earthquakes in the Sichuan-Yunnan Region

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Earthquake Research in China 2015年第1期29卷 128-135页

作者： Sun Zongqiang Xie Xiaojing Gao Huayan Wang Yongmei Fang Yanxun Wang Bin Yao Yuxia Cao Xiaoli Wu Yanfang Earthquake Prevention and Disaster Reduction bureau of Shuifu County Earthquake Administration of Hainan Province seismological bureau of Lufeng County Earthquake Prevention and Disaster Reduction bureau of Zhaotong city Huzhou Seismic Station Yancheng Seismic Station Pingliang Seismic Station seismological bureau of Lijiang city

Since the 20 thcentury,the time intervals of M ≥6.7 strong earthquakes in the SichuanYunnan region show obvious *** the years of the strong events,a twodimensional time coordinate system is generated,based on which,the time prediction model is constructed for strong earthquakes in the Sichuan-Yunnan *** analysis shows that there is risk of generating four earthquakes with M ≥ 6.7 in the Sichuan-Yunnan region in the future 16 years,and there are strong signals for M ≥6.7earthquakes for periods 2012-2021 and *** strong earthquakes may occur around 2014-2015,2019 and 2027.

关键词： The Sichuan-Yunnan region Strong earthquake Two-dimensional timecoordinate system Earthquake prediction Time prediction model

Application of a time-magnitude prediction model for earthquakes

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Applied Geophysics 2007年第2期4卷 138-145页

作者： An Weiping Jin Xueshen Yang Jialiang Dong Peng Zhao Jun Zhang He seismological bureau of Shanxi Province Taiyuan 030002 China seismological bureau of Hebei Province Shijiazhuang 050021 China Communication bureau of Zhangjiakou city Zhangjiakou 75000 China

In this paper we discuss the physical meaning of the magnitude-time model parameters for earthquake prediction. The gestation process for strong earthquake in all eleven seismic zones in China can be described by the magnitude-time prediction model using the computations of the parameters of the model. The average model parameter values for China are： b = 0.383, c=0.154, d = 0.035, B = 0.844, C = -0.209, and D = 0.188. The robustness of the model parameters is estimated from the variation in the minimum magnitude of the transformed data, the spatial extent, and the temporal period. Analysis of the spatial and temporal suitability of the model indicates that the computation unit size should be at least 4°× 4°for seismic zones in North China, at least 3° × 3° in Southwest and Northwest China, and the time period should be as long as possible.

关键词： earthquake prediction robustness time- magnitude model

The　research　of　a　solution　on　locating　optimally　a　station　for　seismic　disasters　rescue　in　a　city

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Acta Seismologica Sinica(English Edition) 1995年第1期8卷 135-142页

作者：姚清林 1. Institute of Geology State Seismological Bureau 100029 Beijing China

When the stations for seismic disasters rescue in future or the similars are designed on a network of communication line, the general absolute center of a graph needs to be solved to reduce the requirements in the number ofstations and running parameters and to establish an optimal station in a sense distribution of the rescue arrivaltime by the way of locating optimally the stations. The existing solution on this problem was proposed by Edward (1978) in which, however, there is serious deviation. In this article, the work of Edward (1978) is developed in both formula and figure,more correct solution is proposed and proved. Then the result from the newersolution is contrasted with that from the older one in a instance about locating optimally the station for seismicdisasters rescue.

关键词： seismosociology earthquake resistance disaster preparedness

Abnormal Phenomena of Volume Strain before Large Earthquakes

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Earthquake Research in China 2015年第3期29卷 373-385页

作者： Wu Lijun Chen Zhengwei Li Hangu Xu Lei An Bayaer Xu Shunqiang Institute of Earthquake Science China Earthquake Administration Key Laboratory of Earthquake Prediction Institute of Earthquake ScienceCEA Wudi Dashan Seismic Station Earthquake Administration of Shandong Province seismological bureau of weihai city Geophysical Exploration Center CEA

This paper studies the imminent anomalies observed by the Sacks volume strainmeter in Erzhangying station and Tiantanghe station before 80 earthquakes with Ms≥ 7. 0 which took place from January 2011 to April 2014 all over the world. Then, preconditions for anomaly identification are put forward for complex earthquake cases. Statistical results show that volume strain observation has a better earthquake reflecting ability for earthquakes with magnitudes larger than 7. 0 and epicentral distance within 8000kin. In addition, these results also reflect that the volume strain observation can better reflect precursory anomalies of such earthquakes. Based on categorization and description of those anomalies, we divide the anomalies into three types, that is, earth tide distortion type, abrupt change type and slow earthquake type. Furthermore, the paper makes a statistical analysis of these types and preliminarily discusses their mechanical properties as well. According to research, volume strain anomaly has an indicative significance to future strong earthquakes in the world.

关键词： Large earthquakes Volume strain The earth tide distortion Abruptchange Slow earthquakes Earthquake case study

Spatial and temporal variation of gravity field in the capital region

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Acta Seismologica Sinica(English Edition) 1995年第3期8卷 427-433页

作者：华昌才果勇刘瑞法肖钢 1. Institute of Geophysics State Seismological Bureau 100081 Beijing China2. Columbia University U. S. A.

The high accurate gravity measurement have been carried out many years in the capital region. The main characteristics of the change of gravity field during the latest eight years (1981 - 1988) in the region are presented inthis paper. The more gravitational variation appeared in the southern and south-eastern part, the maximum variation come to 10-6 ms-2. In the northern part, for instance: Chengde city, and Wan-clan County - westTaihang mountain area which are in the westside of the network, were relative stable. The noticeable areas ofgravitational variation were in Tianjin-Baxian-Renqiu which correspon d with the crustal vertical *** main cause of that is related to pump ground water and petroleum.

关键词： vertical deformation ground water gravity variation

Three dimensional velocity structure and accurate earthquake location in Changning–Gongxian area of southeast Sichuan

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Earth and Planetary Physics 2020年第2期4卷 163-177页

作者： Feng Long ZhiWei Zhang YuPing Qi MingJian Liang Xiang Ruan WeiWei Wu GuoMao Jiang LongQuan Zhou seismological bureau of Sichuan Province Chengdu 610041China College of Geophysics Chengdu University of TechnologyChengdu 610059China Emergency Administration of Yibin city Yibin Sichuan 644000China China Earthquake Networks Center Beijing 100045China

In order to understand the crustal structure and tectonic background of the Changning–Gongxiang area, southeastern Sichuan Province, where a series of moderate-to-strong earthquakes occurred in recent years, we utilized the seismic phase data both from a local dense array and from the regional seismic networks;we used the tomoDD program to invert for the high-resolution three-dimensional velocity structure within the depth range of 0–10 km and for accurate hypocentral locations in this area. We analyzed the seismogenic structures for the events of Xingwen M5.7 in 2018 and Gongxian M5.3 and Changning M6.0 in 2019. The results show that:(1) widespread lateral inhomogeneity exists in the velocity structure of the study area, and the location of the velocity anomaly is largely consistent with known structures. In the range of distinguishable depth, the inhomogeneity decreases with increasing depth, and the velocity structure anomalies in some areas are continuous in depth;(2) earthquakes occurred in clusters, showing the characteristics of zonal folding trends in the NW-SE and NE-SW directions;the focal depth in the area is generally shallow in both the sedimentary cap and the crystalline basement. The seismogenic structures of small earthquake clusters are different in size and occurrence in different sections, and the clusters occurred mostly in regions with high P-or S-wave velocities;(3) synthesis of a variety of data suggests that the seismogenic structures of the Xingwen M5.7 and Changning M6.0 earthquakes are associated with slip faults that trend NW-SE in, respectively, the south wing and the axis of the Changning–Shuanghe anticline, while that of the Gongxian M5.3 earthquake is associated with thrust faults that trend N-S in the Jianwu syncline region. The dynamic sources of the three earthquakes are all from the SE pushing of the Qinghai–Tibet block on the Sichuan basin;(4) the risk of future strong earthquakes in this area must be reevaluated in light of the

关键词： southeastern Sichuan Sichuan Basin three-dimensional velocity structure earthquake precise location