|
|
|
| Microtremor characteristics of sand liquefaction sites during Songyuan Ms 5.7 earthquake |
| LI Ping1，ZHU Sheng1，TIAN Zhaoyang1，2，GU Junru1，ZHOU Chunshu1，LI Yuying1#br# |
(1. The school of geological Engineering，Institute of Disaster Prevention，Sanhe，Hebei 065201，China；2. Shandong Earthquake Agency，Jinan，Shandong 250014，China)
|
|
|
|
|
Abstract Taking the sand liquefaction site of the Songyuan Ms 5.7 earthquake as a research object，the predominant frequency and waveform characteristics of the microtremor H/V spectra in liquefaction and non-liquefaction sites were explored for providing a basis for rapid identification of sand liquefaction during earthquake emergency. The seismic damage of sand liquefaction in Songyuan earthquake was introduced，and the effects of horizontal component combination，spectral window and smooth length on data processing were discussed. Comparisons were performed to determine reasonable data processing parameters and the test data of microtremors at 26 sites were analyzed. The results show that，for the liquefaction sites，the predominant frequency of microtremor H/V spectral ratio is in the range of 0.8 Hz to 1.8 Hz，and that the waveforms have single or double peaks and approach a certain spectral ratio. For the non-liquefaction sites，however，the predominant frequency of microtremor H/V spectra varies from 1.6 Hz to 1.7 Hz，and the waveforms show a single peak or no obvious peak and has a decreasing trend.
|
|
|
|
|
|
[1] KIYOSHI K，TEIJI T. On Microtremors VIII[J]. Bulletin of the Imperial Earthquake Research Institute，1961，39：97–114.
[2] LERMO J，CHÁVEZGARCÍA F J. Are microtremors useful in site response evaluation?[J]. Bulletin of the Seismological Society of America，1994，84(5)：1 350–1 364.
[3] 郭明珠，宋泽清. 论地脉动场地动力特性分析中的Nakamura方法[J]. 世界地震工程，2000，16(2)：88–92.(GUO Mingzhu，SONG Zeqing. On Nakamura method for dynamic analysis of ground characteristics with microtremor[J]. World Earthquake Engineering，2000，16(2)：88–92.(in Chinese))
[4] 高广运，吴世明，周 健，等. 场地卓越周期的讨论与测定[J]. 工程勘察，2000，(5)：28–31.(GAO Guangyun，WU Shiming，ZHOU Jian，et al. Discussion and determination of site predominant period[J]. Geotechnical Investigation and Surveying，2000，(5)：28–31.(in Chinese))
[5] 陶夏新，刘曾武. 工程场地条件评定中的地脉动研究[J]. 地震工程与工程振动，2001，(4)：18–23.(TAO Xiaxin，LIU Zengwu. A review of microtremor study in engineering site rating[J]. Earthquake Engineering and Engineering Vibration，2001，(4)：18–23.(in Chinese))
[6] 谢忠球. 各向异性介质中的场地微动理论及其应用研究[博士学位论文][D]. 长沙：中南大学，2002.(XIE Zhongqiu. The study of theory and application on ground microtremor in anisotropy media[[Ph. D. Thesis][D]. Changsha：Central South University，2002.(in Chinese))
[7] 简文彬，李哲生，黄真萍. 福建沿海地区地微动的谱结构特征[J]. 工程地质学报，2002，10(2)：216–219.(JIAN Wenbin，LI Zhesheng，HUANG Zhenping. On the spectral characteristics of ground microtremor in coastal area of Fujian[J]. Journal of Engineering Geology，2002，10(2)：216–219.(in Chinese))
[8] 许建聪，简文彬，尚岳全. 福建沿海地区场地土对地脉动动力响应的研究[J]. 岩土力学，2003，24(增2)：606–610.(XU Jiancong，JIAN Wenbin，SHANG Yuequan. Study on dynamical response of ground soil on microtremor in coastal area of Fujian[J]. Rock and Soil Mechanics，2003，24(Supp.2)：606–610.(in Chinese))
[9] 许建聪，孙红月. 地脉动作用下的岩土动力响应研究[J]. 振动工程学报，2004，17(2)：147–150.(XU Jiancong，SUN Hongyue. Study on dynamical response of ground soil to micro-tremor[J]. Journal of Vibration Engineering，2004，17(2)：147–150.(in Chinese))
[10] 师黎静，陶夏新. 地脉动方法最新研究进展[J]. 地震工程与工程振动，2007，27(6)：30–37.(SHI Lijing，TAO Xiaxin. Latest advance in microtremor methods[J]. Earthquake Engineering and Engineering Vibration，2007，27(6)：30–37.(in Chinese))
[11] 黄 蕾，方 云，严绍军. 地脉动测试测定场地的卓越周期[J]. 水利与建筑工程学报，2009，7(1)：122–123.(HUANG Lei，FANG Yun，YAN Shaojun. Determination for predominant period of site by earth pulse test[J]. Journal of Water Resources and Architectural Engineering，2009，7(1)：122–123.(in Chinese))
[12] 胡仲有，杨仕升，李 航. 地脉动测试及其在场地评价中的应用[J]. 世界地震工程，2011，27(2)：211–218.(HU Chongyou，YANG Shisheng，LI Hang. Ground microtremor test and its application in evaluation of sites[J]. World Earthquake Engineering，2011，27(2)：211–218.(in Chinese))
[13] 刘红彪，郭 迅. 9度设防区场地脉动测试分析[J]. 地震工程与工程振动，2011，31(6)：24–29.(LIU Hongbiao，GUO Xun. Analysis of site microtremor in district with seismic fortification intensity 9[J]. Earthquake Engineering and Engineering Vibration，2011，31(6)：24–29.(in Chinese))
[14] 陈 拓，吴志坚，马 巍，等. 黄土地区场地条件对地震动放大效应影响研究[J]. 地下空间与工程学报，2012，8(5)：969–974.(CHEN Tuo，WU Zhijian，MA Wei，et al. Study on the effects of site conditions on earthquake ground motion in Loess sites[J]. Chinese Journal of Underground Space and Engineering，2012，8(5)：969–974.(in Chinese))
[15] 李 平，薄景山，孙有为，等. 安宁河及邛海周边地区地脉动特征分析[J]. 地震研究，2013，36(1)：81–85.(LI Ping，BO Jingshan，SUN Youwei，et al. Characteristics analysis of ground microtremor in surrounding area of Anning River and Qionghai Lake[J]. Journal of Seismological Research，2013，36(1)：81–85.(in Chinese))
[16] 张磊刚. 西安地区区域性群发地裂缝的场地动力效应研究[硕士学位论文][D]. 西安：长安大学，2017.(ZHANG Leigang. Research on the dynamic site effects of regional ground fissures in Xi'an Area[M. S. Thesis][D]. Xi¢an：Chang'an University，2017.(in Chinese))
[17] 沈 军，薄景山. 松原市活断层探测与地震危险性评价[M]. 北京：地震出版社，2016：235–260.(SHEN Jun，BO Jingshan. Active faults exploration and seismic hazard assessment in Songyuan City[M]. Beijing：Seismological Press，2016：235–260.(in Chinese))
[18] 武成智，张晨侠，刘俊清，等. 2013年10月吉林省前郭强震群研究[J]. 国际地震动态，2014，(8)：17–21.(WU Chengzhi，ZHANG Chenxia，LIU Junqing，et al. The research on the Qianguo MS5.5 earthquake swarm in 2013 in the Jilin Province[J]. Recent Developments in World Seismology，2014，(8)：17–21.(in Chinese))
[19] OMORI F. On Micro-tremors[J]. Bulletin of the Imperial Earthquake Investigation Committee，1908，2(1)：1–6.
[20] NAKAMURA Y. Clear identification of fundamental idea of nakamura¢s technique and its applications[C]// 12 World Conference on Earthquake Engineering，CD-ROM. [S. l.]：[s. n.]，2000，2656.
[21] JEONG S ，BRADLEY B A . Amplification of strong ground motions at Heathcote Valley during the 2010–2011 Canterbury earthquakes：Observation and 1D site response analysis[J]. Soil Dynamics and Earthquake Engineering，2017，100：345–356.
[22] KONNO K，OHMACHI T. Ground-motion characteristics estimated from spectral ratio between horizontal and vertical components of microtremor[J]. Bulletin of the Seismological Society of America，1998，88(1)：228–241.
[23] 刘宇实，师黎静. 基于地脉动谱比法的场地特征参数快速测定[J]. 振动与冲击，2018，37(13)：235–242.(LIU Yushi，SHI Lijing. Site characteristic parameters¢ quick measurement based on micro-tremor¢s H/V spectra[J]. Journal of Vibration and Shock，2018，37(13)：235–242.(in Chinese))
[24] 大崎顺彦. 地震动的谱分析[M]. 北京：地震出版社，2008，85–94.(OHSAKI Y. Introduction to spectral analysis of ground motion[M]. Beijing：Seismological Press，2008：85–94.(in Chinese))
|
|
|
|
2020, Vol. 39 
