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Characteristics of Horizontal Crustal Movement in the north china region in the Last Decade

Earthquake Research in china 2004年第2期18卷 114-124页

作者： YangGuohua HanYueping WangMin TheFirstCrustalDeformationMonitoringCenter ChinaEarthquakeAdministrationTianjin300180China

Based on high-precision data obtained in the past decade from GPS re-measurement in the north china Network, the Crustal Movement Observation Network of china (CMONOC) and GPS measurement along the Shanxi graben zone, the status and evolution of horizontal crustal movement in the north china region are analyzed. The results show that(1) the Yanshan tectonic zone (Zhangjiakou-Bohai Sea zone)is an active one with the largest horizontal strain in the north china region; The largest tendency differential movement of adjacent blocks is seen between the Yanshan block and the north china plain block; about 2mm/a (left lateral); (2) The significant horizontal differential movement along the boundaries of the north china region is characterized by right-lateral strike-slip movement at the middle-north segment on its west boundary (composed of Yinchuan and other active tectonic zones) and compressive movement at the south segment; while the Yinshan rift zone located along the west segment on its north boundary is dominated by tensile movement. Other boundaries and zones have no obvious differential movement; (3) On the whole, measurements of each period differ from one another, which might result from the nonlinear movement component as well as from the error effect. In the paper, results of the relative movement and strain in different periods are given for different blocks and boundary zones.

关键词： the north china region GPS Characteristics of horizontal movement

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Study on the Method of Short-Term Synthetic Earthquake Prediction in the north china region

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Earthquake Research in china 2004年第2期18卷 188-199页

作者： PingJianjun ZhangYongxian ZhangQingrong LiuSuying ChenJianguo HuangWanfa MiXuemei EarthquakeAdministrationofHebeiProvince Shijiazhuang050021China CenterforAnalysisandPrediction ChinaEarthquakeAdministrationBeijing100036China

Based on the extraction and calculation of the short-term seismic precursory information magnitude from the 114 major precursory observations in the north china region, and together with consideration of factors such as geological structure, seismicity, crustal thickness, and in particular, the current geodynamics of the region, the authors studied the time-space evolution characteristics of the short-term earthquake precursory information magnitude and its relationship with earthquakes and proposed the index and method for the short-term synthetic prediction of earthquakes with M S≥5.0 in the north china region. The inspection through R-value shows that the method is effective to a certain extent for earthquake prediction.

关键词： the north china region Precursory information magnitude of short-term earthquake anomaly Information field Evolution characteristics Methods of synthetic prediction

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The Statistical Analysis of Migration of Strong Earthquakes─Taking the north china region as an Example

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Earthquake Research Advances 2004年第2期 77-86页

作者： Qin Chengzhi 1), Zhou Chenghu 1), Pei Tao 1) and Li Quanlin 2) 1)State Key Laboratory of Resources and Environmental Information System, Institute of Geographic Sciences and Natural Resources Research, CAS, Beijing 100101, china 2)Institute of Geophysics, CEA, Beijing 100081, china State Key Laboratory of Resources and Environmental Information System Institute of Geographic Sciences and Natural Resources Research CAS Beijing 100101 China Institute of Geophysics CEA Beijing 100081 China

The migration of strong earthquakes is an important research topic because the migration phenomena reflect partly the seismic mechanism and involve the prediction of tendency of seismic activity. Research on migration of strong earthquakes has mostly focused on finding the phenomena. Some attempts on getting regularity were comparatively subjective. This paper suggests that there should be indices of migration in earthquake dataset and the indexes should have statistical meaning if there is regularity in the migration of strong earthquakes. In this study, three derivative attributes of migration, i.e., migration orientation, migration distance and migration time interval, were statistically analyzed. Results in the north china region show that the migration of strong earthquakes has statistical meaning. There is a dominant migration orientation (W by S to E by N), a dominant distance (≤100km and on the confines of 300～700km), and a dominant time interval (≤1a and on the confines of 3～4a). The results also show that the migration will differ slightly with different magnitude range or earthquake activity phase.

关键词： Migration of strong earthquakes Statistical analysis the north china region

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