Attenuation relations for strong seismic ground motion in Canada
Attenuation relations for strong seismic ground motion in Canada
复制标题
加拿大强地震地震动的衰减关系
DOI：
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发表时间：
1981
影响因子：
3
通讯作者：
Michael J. Berry
中科院分区：
文献类型：
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作者：
H. Hasegawa;P. Basham;Michael J. Berry
摘要强地震动衰减关系主要基于美国西部的数据，结合加拿大东部和西部的烈度数据，推导出新的水平强地震动衰减关系，以应用于加拿大各地。加拿大西部的峰值加速度（a p）和峰值速度（v p）关系式为a p（cm sec − 2）= 10 e 1.3 M R − 1.5 v p（cm sec − 1）= 0.00040 e 2.3 M R − 1.3其中M为震级，R为震源距离（km）。加拿大东部和西部修正的麦加利强度的距离衰减的差异，以及两个地区近场等效强运动的假设，应用于西部关系，得到以下建议在加拿大东部使用的关系：（cm sec − 2）= 3.4 e 1.3 M R − 1.1 v p（cm sec − 1）= 0.00018 e 2.3 M R − 1.0。建议的关系是在合理的协议与少量的强震数据可用于加拿大西部和东部。在合理的精度非常分散的实验数据，峰值垂直和持续水平加速度和速度可以估计为2 - 3的峰值水平值。加速度和速度参数的幅度和距离依赖性是足够不同的，在不同的频率范围内的地面运动边界的相对水平将取决于占主导地位的震级，距离范围，地震在加拿大的各个地区的风险。结果表明，除了简单的峰值加速度的参数映射风险的重要性，并提出了替代方法推导出设计反应谱的发展所需的地面运动的界限。
Abstract Strong seismic ground motion attenuation relations based primarily on Western United States data, in conjunction with intensity data from eastern and western Canada, are employed to derive new attenuation relations for horizontal strong seismic ground motion for application throughout Canada. The following peak acceleration ( a p ) and peak velocity ( v p ) relations are proposed for use in western Canada a p ( cm sec − 2 ) = 10 e 1.3 M R − 1.5 v p ( cm sec − 1 ) = 0.00040 e 2.3 M R − 1.3 where M is magnitude and R hypocentral distance (km). The difference in the distance attenuation of Modified Mercalli intensity in eastern and western Canada, and an assumption of equivalent strong motion in the near field in the two regions, is applied to the western relations to derive the following relations proposed for use in eastern Canada a p ( cm sec − 2 ) = 3.4 e 1.3 M R − 1.1 v p ( cm sec − 1 ) = 0.00018 e 2.3 M R − 1.0 . The proposed relations are in reasonable agreement with the small amount of strong motion data available for western and eastern Canada. Within the accuracy justified by very scattered experimental data, peak vertical and sustained horizontal acceleration and velocity can be estimated as 2 3 of the peak horizontal values. The magnitude and distance dependence of acceleration and velocity parameters are sufficiently different that the relative levels of ground motion bounds in different frequency ranges will depend on the dominant magnitudes of, and distance ranges to, the earthquakes contributing risk in various regions of Canada. The results indicate the importance of mapping risk for parameters in addition to simple peak acceleration, and suggest alternative methods of deriving ground motion bounds required for the development of design response spectra.