Nationwide site amplification zoning using GIS-based Japan Engineering Geomorphologic Classification Map
Nationwide site amplification zoning using GIS-based Japan Engineering Geomorphologic Classification Map
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发表时间：
2005
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通讯作者：
M. Matsuoka;K. Wakamatsu;K. Fujimoto;S. Midorikawa
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作者：
M. Matsuoka;K. Wakamatsu;K. Fujimoto;S. Midorikawa
本文利用基于gis的地情图“日本工程地貌分类图（JEGM）”对日本全境进行横波速度制图。首先，我们研究了提出的JEGM地貌分类单元与30m以上平均横波速度（AVS30）之间的关系，AVS30是估计峰值地面速度（PGV）场地放大因子的一个简单而有用的预测因子。AVS30是在日本各地测量了大约2000个横波速度的地点进行计算的。所有钻孔测井数据的地貌单位都是使用1:1万比例尺的土地分类图来解释的，这是JEGM的基础纸质图。计算各地貌单元AVS30的平均值和方差。各地貌单元的平均avs30与地貌分类相关。接下来，我们不仅考察了地貌单元之间的相关性，还考察了由JEGM和AVS30值得出的地理信息之间的相关性。avs30还显示出与海拔、坡度和距离山脉或丘陵的距离有一定的相关性。为了建立AVS30的估算模型，利用这些地貌指标进行了多元线性回归分析。利用该模型估计AVS30的标准误差为35%。因此，我们可以实现使用JEGM为全日本创建精度相对较高的AVS30地图。因此，发达的JEGM可以详细估算全国范围内强地震动的场地放大系数。
In this paper, a mapping of shear-wave velocity for all of Japan is performed using "Japan En- gineering Geomorphologic Classification Map (JEGM)" which has been developed as a GIS-based ground condition map. At first, we investigate relationships between the proposed geomorphologic classification unit of the JEGM and the average shear-wave velocity in the upper 30m (AVS30), which is a simple and useful predictor for estimating site amplification factors of peak ground velocity (PGV). The AVS30 is computed for approximately 2,000 sites where shear-wave velocity has been measured in all over Japan. Geomorphologic units for all boreholes logging data are interpreted using land-classification maps at a scale of 1: 50,000 that are the base paper maps for the JEGM. The average value and variance of AVS30 for each geomorphologic unit are then calculated. The mean AVS30s among geomorphologic units are found to correlate with the geomorphologic classification. Next, we examine the correlation between not only geomorphologic units but also geographic information derived from the JEGM and the AVS30 values. The AVS30s also show some dependency with elevations, slope gradients, and distances from mountains or hills. In order to develop the estimating model of the AVS30, multiple linear regression analysis is conducted using these geomorphologic indices. The standard error of the AVS30 estimation by using this model is 35%. Therefore, we can achieve to create an AVS30 map with relatively high accuracy for all of Japan using the JEGM. Thus, developed JEGM can be allowed detailed estimation of the site amplification factor of strong ground motion nationwide.