权益分类	功能权益	普通用户	{{item.name}}会员
{{category.name}}	{{benefitItem.name}}

STRONG MOTION PREDICTION AND DESTRUCTIVITY EVALUATION FOR AN INHOMOGENEOUS SEDIMENTARY BASIN BASED ON THE UNDERGROUND STRUCTURE AS ESTIMATED FROM MICROTERMOR OVSERVATIONS

基于微温观测估算地下结构的非均质沉积盆地强运动预测及破坏性评价

基本信息

批准号：
13680548
负责人：
SHINOZAKI Yuzo
金额：
$ 2.18万
依托单位：
Tokyo University of Science
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
2001
资助国家：
日本
起止时间：
2001 至 2002
项目状态：
已结题

项目摘要

We investigated the practical applicability, to large arrays of seismometers with radii up to 600 meters, of the tentatively named Enlarged Henstridge method, a recently proposed method of microtremor exploration to obtain, in a fairly simple way, the S-wave velocity structure which in one of the most important parameters to represent the underground structure. The Enlarged Henstridge method, which allows one to obtain the dispersion curve of the phase velocity of surface waves by measuring microtremors with an array of seismometers placed at least 3 locations along a circumference, is characterized by the lack of necessity to place a seismometer at the center of the circle and by the tolerance for uneven spacing of seismometers along the circumference. The applicability of the method had been demonstrated for arrays with radii of 5 and 15 meters, but it had never once been applied to larger arrays. In order to investigate the practical applicability of the Enlarged Henstridge Method t … More o large arrays consisting of 3 stations, we conducted an exploration of microtremors, at a location where the underground structure is known, by deploying circular arrays of 3 seismometers spaced at even or uneven intervals along circumferences 25 to 600 meters in radius.We first measured microtremors with an array of 4 stations, or 3 stations spaced at nearly equal intervals along a circumference plus a fourth station at the center of the circle, and estimated the dispersion curve a beneath the observation site by applying the SPAC method to the data obtained. We then estimated the dispersion curve with the Enlarged Henstridge method by using arrays of 3 evenly or unevenly spaced stations, and examined the adequacy of the analysis results by comparing them with the dispersion curve as estimated with the SPAC method. We found that the Enlarged Henstridge method was comparable to the SPAC method in terms of the accuracy of the analysis results, and that the wavelength range, over which the dispersion curve could be evaluated adequately, tended to shift toward longer wavelengths as compared with the case of the SPAC method.Uneven spacing of seismometers has influences, by way of observation errors and other factors, on the estimation accuracy for the dispersion curve. We empirically investigated the tolerable extent of unevenness in the configurations of the stations for which appropriate dispersion curves could be obtained with a high likelihood, as well as the wavelength ranges over which those appropriate dispersion curves were obtained in that case. Less

我们研究了实际适用性，大阵列的地震仪与半径达600米，暂命名为扩大亨斯特里奇方法，最近提出的方法微动勘探，以获得，在一个相当简单的方式，S波速度结构，在一个最重要的参数，以代表地下结构。扩大的亨斯特里奇方法允许人们通过用沿圆周沿着放置至少3个位置的地震仪阵列测量微震动来获得面波相速度的频散曲线，其特征在于不需要将地震仪放置在圆心处，并且允许地震仪沿圆周沿着不均匀。该方法的适用性已被证明适用于半径为5米和15米的阵列，但从未被应用于更大的阵列。为了研究扩大的亨斯特里奇法的实用性， ...更多信息在已知地下构造的地点，用3个地震计组成的圆形阵列，沿着半径25 ~ 600米的圆周均匀或不均匀地布置，进行了一次由3个地震计组成的大型阵列的微震探测。或沿沿着以几乎相等的间隔分布的3个测站加上在圆心的第4个测站，并通过对所获得的数据应用SPAC方法来估计观测点下方的频散曲线a。然后，我们使用3个均匀或不均匀分布的台站阵列，使用扩大的亨斯特里奇方法估计频散曲线，并通过将其与使用SPAC方法估计的频散曲线进行比较来检查分析结果的充分性。结果表明，扩大的亨斯特里奇法与SPAC法在分析结果的准确性上相当，但与SPAC法相比，能充分估计频散曲线的波长范围有向长波长方向移动的趋势。对色散曲线的估计精度。我们根据经验研究了可以以很高的可能性获得适当色散曲线的台站配置中的不均匀性的可容忍程度，以及在这种情况下获得这些适当色散曲线的波长范围。少