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首页> 外文期刊>Bulletin of earthquake engineering >Source and high-frequency decay parameters for the Azores region for stochastic finite-fault ground motion simulations
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Source and high-frequency decay parameters for the Azores region for stochastic finite-fault ground motion simulations

机译：亚速尔群岛地区的源和高频衰减参数，用于随机有限故障地震动模拟

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摘要

Strong ground motion prediction based on finite-fault simulation requires the identification of the fault (strike, dip, length and width), source kinematics parameters (stress drop, rupture velocity and slip distribution), regional crustal properties (geometrical spreading, anelastic structure, and upper crustal amplification and attenuation parameters) and the determination of amplification effects due to the local site geology. The general purpose of this study is to understand source and attenuation properties in the Azores, by the determination of stress drop, quality factor and kappa, through records obtained by the Portuguese digital seismic and accelerometer network. Source Spectra were obtained, for each record, after correcting observed spectra from geometrical spreading and anelastic attenuation effect: quality factor was estimated based on coda decay in the time domain and the kappa parameter was estimated by fitting the high-frequency decay of the acceleration spectrum with a straight line in a log-linear scale. Mean stress drop value was obtained considering that omega-squared model for the source spectra prevails. Parameters kappa, k, and quality factor, Q, have been estimated to be k = (0.075 +/- 0.02)s and , respectively. A mean value of stress drop was estimated to be around 90-130 bars for the earthquakes in analysis. The knowledge of source and path parameters, in association with other ground motion parameters, allows improving ground-motion estimates for the Azores and, consequently, will lead to more accurate seismic hazard assessment for the Azores and better characterization of seismic scenarios.
机译：基于有限断层模拟的强地面运动预测需要确定断层（走向，倾角，长度和宽度），源运动学参数（应力降，破裂速度和滑动分布），区域地壳特性（几何扩展，非弹性结构，以及上地壳的放大和衰减参数），以及由于当地地质原因确定的放大效果。这项研究的总体目的是通过确定由葡萄牙数字地震和加速度计网络获得的记录，通过确定应力降，品质因数和κ来了解亚速尔群岛的震源和衰减特性。对于每条记录，从几何扩展和非弹性衰减效应校正观察到的频谱后，获得源频谱：根据时域中的尾波衰减估算品质因数，并通过拟合加速频谱的高频衰减估算kappa参数以对数线性标度的直线表示。考虑到源谱的欧米加平方模型占主导地位，因此获得了平均应力降值。参数kappa和质量因子Q分别估计为k =（0.075 +/- 0.02）s和。对于分析中的地震，应力下降的平均值估计约为90-130巴。源和路径参数的知识与其他地面运动参数相关联，可以改进亚速尔群岛的地震动估计，因此，将导致对亚速尔群岛的地震危险性评估更加准确，并能更好地表征地震情境。

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