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Chinese Science Bulletin 2002年第4期47卷 334-336页

作者： ZHANG Hong WANG Chao SHAN Xinjian MA Jin TANG Yixian QUO Ziqi LARSIS Institute of Remote Sensing ApplicationsChinese Academy of SciencesBeijing 100101China Institute of Geology Seismology Bureau of ChinaBeijing 100029China

On 10 January, 1998 an earthquake of Ms=6.2 occurred in the zhangbei-shangyi region of North China. The surface seismic deformation was measured in the previous study using the 3 pass ERS-1/2 SAR differential inter-ferometric technology (D-INSAR). In this note the focal mechanism of zhangbei-shangyi earthquake is estimated from the D-INSAR measurement of surface deformation based on a standard elastic dislocation model for seismic displacement. The inversion procedure is an iterative, linear least-squares algorithm. Through the relation between the focal parameters and displacement in the line of sight direc-tion measured in the radar interferogram, the optimum focal parameter set is derived. The results show that the seismic fault of zhangbei-shangyi earthquake is a thrust fault dip-ping SW with a large right-lateral displacement component. The strike and dip are 95°and 30°respectively on a fault patch of 12 km long by 14 km wide. Its hypocenter is located at N40°58’, E114°21’, and 7.5 km in depth.

关键词： D-INSAR interferometric fringes dislocation model zhangbei-shangyi earthquake.

Tracing Subsurface Fluid Anomalies Before zhangbei-shangyi Earthquake and Prediction of the Earthquake

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Earthquake Research in China 1998年第4期12卷 100-108页

作者： Che Yongtai, Wang Jihua, Lin Yuanwu, Zhu Qingzhong, and Zhang PeirenInstitute of Geology, CSB, Beijing 100029, China

High-value subsurface fluid anomalies appeared in the northern part of North China region for more than two years before the zhangbei-shangyi earthquake. Some of the anomalies have appeared alternately and were correlated with moderate and moderately strong earthquakes in the region during the last year (1997). Typical short-term subsurface fluid anomalies have appeared in the area at 100 km ~ 200 km distance from the epicenter for two months before an earthquake. Tracing these anomalies during the last two years and repeatedly improving the knowledge of seismic regime, we have more successfully performed short-term and imminent earthquake prediction at half a month before its occurrence.

关键词： Earthquake prediction Subsurface fluid anomaly zhangbei-shangyi earthquake.

Seismotectonic Environment for zhangbei-shangyi Earthquake and Characteristics of Macroscopic Damage

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Earthquake Research in China 1999年第3期13卷 68-81页

作者： Xu Xiwei, Rang Yongkang, Zhou Bengang, Yin Gongming, Li Jianhua, and Liu WuzhouInstitute of Geology, CSB, Beijing 100029, China

The regional seismotectonic environment for the zhangbei- shangyi earthquake is described, and in combination with the distribution of macroscopic seismic intensity, source mechanism solution, and interpretation of lineaments on satellite images, the seismogenic structure for the earthquake and possible seismogenic fault are discussed in this paper. It is suggested that the zhangbei-shangyi earthquake is a result of the latest movement along the northwestern termination of the Zhangjiakou-Penglai fault zone and we should pay serious attention to the future trend of seismic activity along this fault zone.

关键词： Seismotectonics Macroscopic seismic intensity investigation zhangbei-shangyi earthquake.

Structure of the Crust and Upper Mantle Beneath the zhangbei-shangyi Earthquake Area and Its Surroundings

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Earthquake Research in China 1999年第1期13卷 15-26页

作者： Zhao Guoze, Zhan Yan, Liu Guodong, Jiang Zhao, Liu Tiesheng, Tang Ji, Wang Jijun, Li Wenjun, and Liang JinggeInstitute of Geology, CSB, Beijing 100029, China

The study of deep-seated structure in the zhangbei-shangyi earthquake area and its surroundings indicates that in comparison with the Shanxi rift system, the North China rifted basin, the Yanshanian fold belt on both sides, and the Zhangjiakou-Penglai tectonic belt have lower resistivity, and a distinctly different velocity interface in the crust and depth distribution of Moho discontinuity. The Yanqing- Huai’lai basin bisects the Zhangjiakou-Penglai tectonic belt into two segments, the northwestern and the southeastern segments. The latest magnetotelluric sounding and investigation indicate that the electrical structure within the zhangbei-shangyi earthquake area is different to a certain degree from that in its surroundings. There exists a nearly NNW-trending structure in the crust. The main shock and most aftershocks occurred above the low-resistivity zone in the crust.

关键词： Crust Upper mantle Magnctotelluric sounding Zhangjiakou-Penglai tectonic belt zhangbei-shangyi earthquake.