H/V谱比方法在强震记录应用中几个影响因素的初步研究

Preliminary Study on the Influencing Factors of the Horizontal-to-Vertical Spectral Ratio Applied in Strong Motion

摘要:

随着我国强震记录的积累，利用强震记录进行工程场地抗震设防研究成为必然。使用滇西南地区2007—2011年间强震台网记录到的强震动记录数据，研究使用水平/垂直谱比法（H/V）处理强震数据时的几个影响因素。通过研究发现：在使用H/V谱比法进行场地地震效应研究时，强震记录和地脉动记录存在较大的不同；使用强震记录可以获得更多的震源和台站场地参数信息，但这同时也相应增加了强震数据使用时的难度。比较国内外学者使用强震数据进行场地地震效应的研究成果，分析在使用强震数据时存在的问题，最终给出使用强震记录研究场地效应的建议。

Abstract:

In China, the use of strong motion records to study the earthquake fortification of engineering sites has become inevitable with the accumulation of strong motion records. In this work, the strong motion records for southwest Yunnan Province for the period of 2007 to 2011 and the horizontal-to-vertical spectral ratio (H/V) method were used to study several influencing factors in strong motion recording. Results reveal the existence of considerable differences between strong motion records and microtremor records when the H/V method is applied to develop site effects. Strong motion records can be used to acquire additional information on the earthquake epicenter and station site parameters but are more difficult to use than noise because they are more complex than the noise records. The domestic and international findings for site effects obtained by using strong motion records are compared. Next, the potential problems encountered in the use of strong motion records are analyzed. Some suggestions for the investigation of site effects by using strong motion records are provided.