检索结果-南通市图书馆

Acta Seismologica Sinica(English Edition) 2001年第4期14卷 471-480页

作者：平建军张青荣曹肃朝边庆凯 1. Seismological Bureau of Hebei Province 050021 Shijiazhuang China

Before a strong earthquake, there is often a process of quiescence or 2absence2 of regional seismic activity, which is a phenomenon that has attracted the attention of many scholars in china and other countries (LU, et al, 1985; Wesson, 1973). In the past ten-odd years, some Chinese seismologists made, earlier or later, special studies on the quiescence anomaly of seismicity in some specified areas from different angles. Taking the converted annual frequency of M=5.0 earthquakes in north china region as a characteristic quantity, JIANG and FENG (1989) analyzed the quiescence anomaly of seismic activity by fuzzy recognition.

关键词： north china region quiescence anomaly index for short-term prediction

Influences of the Extratropical Pacific SST on the Precipitation of the north china region

在线全文

学校读者我要写书评

暂无评论

Advances in Atmospheric Sciences 1997年第3期14卷 52-62页

作者： Geng Quanzhen Ding Yihui Huang Chaoying National Climate Center 100081 Beijing

ＩｎｆｌｕｅｎｃｅｓｏｆｔｈｅＥｘｔｒａｔｒｏｐｉｃａｌＰａｃｉｆｉｃＳＳＴｏｎｔｈｅＰｒｅｃｉｐｉｔａｔｉｏｎｏｆｔｈｅＮｏｒｔｈＣｈｉｎａＲｅｇｉｏｎＧｅｎｇＱｕａｎｚｈｅｎ（耿全震），ＤｉｎｇＹｉｈｕｉ（丁一汇... 详细信息

ＩｎｆｌｕｅｎｃｅｓｏｆｔｈｅＥｘｔｒａｔｒｏｐｉｃａｌＰａｃｉｆｉｃＳＳＴｏｎｔｈｅＰｒｅｃｉｐｉｔａｔｉｏｎｏｆｔｈｅＮｏｒｔｈＣｈｉｎａＲｅｇｉｏｎＧｅｎｇＱｕａｎｚｈｅｎ（耿全震），ＤｉｎｇＹｉｈｕｉ（丁一汇）ａｎｄＨｕａｎｇＣｈａｏｙｉｎｇ...

关键词： Extratropical Pacific SST Influence Precipitation north china region

Some evidences for earthquake occurrence in the shallow crust in some areas of north china and Southwest china

在线全文

学校读者我要写书评

暂无评论

Acta Seismologica Sinica(English Edition) 2001年第4期14卷 456-465页

作者：胡新亮刁桂苓高景春张四昌张学民李钦祖秦清娟朱振兴张彦清 1. Seismological Bureau of Hebei Province 050021 Shijiazhuang China

The parameters of hypocentral location are important fundamental data for the study of seismology and the earth interior physics; among them, the focal depth is a very important one but can hardly be measured with higher precision. With the increase of seismic stations in number, the heightening of observation quality and the improvement of determination method, such a situation has been changed much. In this paper, the results of hypocentral location and re-location by 7 small-aperture digital seismic station networks at Tangshan, Zhangbei and Huailai of Hebei Province, Datong of Shanxi Province and Jianchuan, Luquan and Yao'an of Yunnan Province are used. Using these results together with those of focal depth inversion by far-field data of some individual large shocks in corresponding areas and those re-determined by the Linfen telemetered seismic network of Shanxi Province, a comparison with the results of focal depth determination in the past earthquake catalogues is made. It is found out that the focal depths determined by the small-aperture seismic networks are basically distributed in the range from the earth surface to ten-odd kilometers underground. In contrast, the focal depths determined in the past are mostly distributed at the depth range from the earth surface to 30 km underground. Besides, there is a difference of 50% to 100% between the average values of the two cases, which is quite an obvious one. From the result of analysis, it is considered that the results determined by the small-aperture seismic networks may be closer to the reality of focal depths distribution. That is to say, earthquakes in the above-mentioned areas should be distributed in the shallow part of the crust. The causes that lead to the above situation are discussed preliminarily, and some suggestions and measures for improving the precision of focal depth determination are put forward.

关键词： north china region Southwest china region focal depth shallow crust

Inversion of the Volumetric Strain of Aquifer According to the Tidal Effect of Groundwater in north china

在线全文

学校读者我要写书评

暂无评论

Earthquake Research in china 2014年第4期28卷 520-531页

作者： Yang Liu Ma Jianying Cao Jingquan Shao Yongxin Liu Wenbing Earthquake Administration of Tianjin Municipality Institute of Geophysics CEA

The change of the confined aquifer level reflects the pore pressure change,and the pore pressure change of the aquifer is closely related to the aquifer pressure. This paper uses the tidal response of the well water level data in the north china region to calculate the tidal factor of each well and extract the effective water trend information. Then,the volumetric strain of an existing confined aquifer well in the north china region is inverted,and the contour maps are plotted on a half-year scale from 2009 to 2012. Results show that it can reflect the state of stress and strain in deep crust to a certain extent in the north china region.

关键词： north china region Water level Tidal factor Volumetric strain