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首页> 外文期刊>Bulletin of earthquake engineering >Modeling energy release parameters in stochastic simulation of ground motions generated by Vrancea intermediate-depth seismic source
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Modeling energy release parameters in stochastic simulation of ground motions generated by Vrancea intermediate-depth seismic source

机译：维兰叶中间深度地震源产生的地面运动随机仿真中的能量释放参数

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Ground motion time-domain stochastic simulations are performed by generating a white or a Gaussian noise, shaping it with a window, loading its normalized spectrum with the spectrum of the motion at a specific site and transforming it back in time-domain (Boore in Pure Appl Geophys 160: 635-676, 2003). The outcome of the resulted simulations is compared to the target parameters, namely amplitude, frequency content and duration parameters. Using SMSIM (Boore in SMSIM: Fortran programs for simulating ground motions form earthquakes, 2005) and EXSIM (Motazedian and Atkinson in Bull Seismol Soc Am 95(3): 995-1010, 2005. 10.1785/0120030207), Co & x21b;ovanu (J Mil Technol 1(2): 27-32, 2018. 10.32754/jmt.2018.2.05) and Co & x21b;ovanu and Vacareanu (J Seismol 24(1): 229-241, 2020. 10.1007/s10950-019-09892-5) applied the stochastic simulation method for generating ground motions produced by intermediate-depth Vrancea (Romania) earthquakes and found inconsistent results for duration parameters (significant duration and energy distribution in time-domain). In simulations, the duration of the motion results from the source and path duration, but the significant duration (that contains 90% of the energy) depends on the way the energy is distributed in time, and this distribution is controlled through a noise shaping window. The objective of this paper is to provide an appropriate form of the shaping window that can describe the specific energy release of ground motions generated by Vrancea intermediate depth seismic source (the first 50-70% of energy being rapidly released, the rest of it having a very slow release). For this matter, 371 recorded motions were analyzed and 5 types of energy release were defined. The set with the above described pattern that contained almost half of the analyzed accelerograms was used to define a mean normalized cumulative energy that describes the Vrancea specificity. On this basis, the parameters for the SMSIM implemented exponential window were determined and, because the results were inconsistent, a more adequate window function was defined and implemented in SMSIM. For the newly defined two-interval window function an algorithm for calculating the parameters was described, and the parameters of the mean release of energy were determined. By using the two-interval function for describing the Vrancea specific release of energy, more appropriate ground motion simulations resulted.
机译：通过生成白色或高斯噪声来进行地面运动时域随机模拟，将其与窗口塑造，将其归一化频谱加载到特定站点的运动频谱并将其转换回到时域（纯净的孔苹果Geophys 160：635-676,2003）。将所得模拟的结果与目标参数，即幅度，频率内容和持续时间参数进行比较。使用SMSIM（SMSIM的歌曲：用于模拟地震，2005）和EXSIM（Motozedian和Atkinson的Fortran计划，在公牛Seismol Soc AM 95（3）：995-1010,2005.10.1785 / 0120030207），CO＆x21b; ovanu （J MIL Technol 1（2）：27-32,2018。10.32754 / JMT.2018.2.05）和Co＆X21B; ovanu和vacareanu（J Seismol 24（1）：229-241,2020 .10.1007 / S10950-019 --09892-5）应用随机仿真方法，用于产生中间深度vrancea（罗马尼亚）地震产生的地面运动，发现持续时间参数的不一致结果（在时域中的显着持续时间和能量分布）。在仿真中，动作的持续时间来自源和路径持续时间，但显着的持续时间（包含90％的能量）取决于能量分布在时间的方式，并且通过噪声整形窗口控制该分布。本文的目的是提供一种适当形式的成形窗，可以描述由维兰叶中间深度地震源产生的地面运动的特定能量释放（首先50-70％的能量迅速释放，其余部分一个非常缓慢的释放）。就此，分析了371个记录的运动，并定义了5种类型的能量释放。使用上述图案的设置包含几乎一半分析的加速局的图案用于定义描述Vrancea特异性的平均归一化累积能量。在此基础上，确定了SMSIM实现的指数窗口的参数，因为结果不一致，在SMSIM中定义并实现了更具足够的窗口功能。对于新定义的两个间隔窗口功能，描述了一种计算参数的算法，并且确定了能量的平均释放的参数。通过使用双间隔功能来描述Vrancea特定的能量释放，导致更合适的地面运动模拟。

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