Geomorphological site classification for the Fujian province

Geomorphological classification of the Fujian province was done based on remote-sensing imaging, digital elevation maps, and slope gradient data acquired by ArcGIS 9.2. The engineering geological units in the Fujian province were divided into five types by the geomorphologic shape and genesis. The relationship among geomorphological type, engineering geological unit, and site category was determined using engineering geological data and site category data. Then, after making a preliminary site classification adjusted by drill hole data, the site was classified into four types: I₀, I₁, II, and III according to site classification standards of equivalent shear-wave velocity and overburden thickness. The results showed that the site categories in the Fujian province mainly consist of type II, which accounts for 85.26 % of the land area. The percentage of I₀ was the smallest, which accounts for only 2.44 % of the total area.     

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滇西地区近期重力场变化与地震活动

对2010—2012年川滇西部地区流动重力资料进行统一处理,得到区域重力场变化图象,并以此为基础研究2012年宁蒗-盐源5.7、彝良5.7级地震与区域重力场变化及安宁河-则木河断裂带的关系。结果显示:震区局部重力场在两次地震前均出现了快速、大幅的上升变化,在约一年的时间内增加了约60×10 nms-2的重力变化量。     

山东重力场季节性变化特征

利用山东地区2010—2012年6期流动重力测量资料,研究了鲁南网重力场的变化特征。结果表明重力场呈明显的季节性变化,即每年的3月与8月,重力场存在反向变化,变化幅值相近;季节性变化与降水有关。     

2010年1月24日山西河津-万荣MS4.8地震的震源机制解与发震构造探讨

2010年1月24日,山西省运城市河津-万荣交界地区发生Ms4.8地震.由于本次地震强度较低,并未形成地表破裂带,分析其发震构造具有一定的困难.地震现场工作队只能根据浅层人工地震剖面、附近钻孔资料、烈度等震线长轴和震中区附近活动断裂等来推定,认为西辛封隐伏断裂为可能的发震断裂.为此,下面我们将在分析本次地震的震源机制解、序列三维空间分布特征的基础上,结合本次地震的宏观考察结果,确定其发震构造并探讨发震机理.     

Seepage field distribution and water inflow laws of tunnels in water-rich regions

Currently,the water inrush hazards during tunnel construction,the water leakage during tunnel operation,and the accompanying disturbances to the ecological envi...     

体应变仪大地震时两次自动调零数据的处理

仪器在较大波动幅度的影响下产生自动调零（电磁阀门开启）,与地震信息混在一起,难以直接使用原始数据。合理消除自动调零带来的影响,还原真实情况,成为台站必须解决的问题。采用确定校正值的方法,力图还原为连续记录,结果发现：处理后的资料可以和另外一台没有调零动作的体积应变仪器的原始资料相符合。     

接收台阵、震源阵的传递函数与双聚束法的初步研究

根据汶川地震序列,选出距离合适、波形相关性较好的事件作为震源阵,联合永久台阵(那曲、和田台阵),进行震源阵与固定台阵组合研究,计算其台阵响应.结果表明,地震序列可以形成震源阵,按照地震台阵的特殊方法进行研究,可以提高信噪比,为揭示地下精细结构提供条件.