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首页> 外文期刊>Seismological research letters >Attenuation and source characteristics of the 23 june 2010 M 5.0 Val-des-Bois, Quebec, earthquake
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Attenuation and source characteristics of the 23 june 2010 M 5.0 Val-des-Bois, Quebec, earthquake

机译：魁北克地震，2010年6月23日M 5.0 Val-des-Bois的衰减和震源特征

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The M 5.0 23 June 2010 Val-des-Bois, Quebec, earthquake produced a rich instrumental and felt ground-motion database. We use instrument-corrected response spectra and Fourier amplitude data from 120 stations, at distances from 60 to 1,000 km, to examine the attenuation and source characteristics of this important event. The Val-des-Bois earthquake produced relatively large response spectral amplitudes at distances less than 200 km, greater than predicted by most recent ground-motion prediction equations (GMPEs) (including the Atkinson and Boore 2006 equations). By contrast, reported intensities at regional distances tended to be smaller than predicted by intensity GMPEs (Atkinson and Wald 2007), although they were high in the epicentral area. From recent moderate earthquakes in eastern North America (ENA) (2010 Val-des-Bois and the 2005 Riviere du Loup event), we have learned that amplitudes at near distances are not well-predicted by average attenuation shapes drawn to pass through regional observations. To infer the source spectrum or near-source motions, we suggest the use of seismic moment as a constraint on the level of the source spectrum. Using Q-corrected observations to deduce the sourcespectral shape, and the known seismic moment to fix its absolute amplitude level, we obtain an apparent source spectrum for the Val-des-Bois earthquake. The Val-des-Bois source spectrum is well described by a Brune model with a stress drop of 250 bars. Future work will focus on resolving near-source attenuation issues to provide better GMPEs for ENA for all magnitudes.
机译：M 5.0 2010年6月23日，魁北克Val-des-Bois地震产生了丰富的仪器和感觉地面运动数据库。我们使用仪器校正后的响应光谱和120个站点（距离60至1,000 km）的傅立叶振幅数据来检查此重要事件的衰减和震源特征。 Val-des-Bois地震在小于200 km的距离处产生相对较大的响应频谱幅度，大于最新的地面运动预测方程（GMPE）预测的幅度（包括Atkinson和Boore 2006方程）。相比之下，尽管在震中区域较高，但报告的区域距离强度往往比强度GMPE预测的强度要小（Atkinson和Wald 2007）。从最近在北美东部（ENA）发生的中度地震（2010 Val-des-Bois和2005 Riviere du Loup事件），我们了解到，通过区域观测得出的平均衰减形状不能很好地预测近距离处的振幅。 。为了推断源频谱或近源运动，我们建议使用地震矩作为对源频谱水平的约束。使用Q校正的观测值推导出震源频谱形状，并使用已知的地震矩固定其绝对振幅水平，我们获得了Val-des-Bois地震的表观震源谱。 Val-des-Bois源谱由Brune模型很好地描述，应力降为250 bar。未来的工作将集中在解决近源衰减问题上，以为所有级别的ENA提供更好的GMPE。

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