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首页> 外文期刊>Journal of African earth sciences >Determination of earthquake source parameters using the inversion of waveform data: A case of small earthquakes around High Dam Lake, Aswan region, Egypt
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Determination of earthquake source parameters using the inversion of waveform data: A case of small earthquakes around High Dam Lake, Aswan region, Egypt

机译：利用波形数据反演确定震源参数：以埃及阿斯旺地区高坝湖附近的小地震为例

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摘要

The earthquake source parameters of 310 seismic events recorded by Aswan broadband seismic network with local magnitude ranges from 0.9 to 3.5 are determined. The Generalized Inversion Technique (GIT) assuming that a reference site was applied to isolate the source one, site, and path effects from the observed displacement P-wave spectra by means of linear least square analysis. The inversion technique was formulated based on Brune's omega-squared source model. The long period asymptote and the corner frequency are two essential parameters to achieve the desired goals of the current study. The source parameters are estimated (seismic moment, static stress drop, dislocation area, corner frequency and source radius), using the displacement source spectra from P- wave portion. The determined stress drop values range from 0.03 to 2.9 MPa, with an average of 0.3 MPa. The lower stress drop values obtained may reflect that reservoir-induced earthquakes have a lower stress drop. The stress drop doesn't show significant dependence on the earthquake depth in Aswan region. Seismic moment, source radius, and corner frequency range from, 1.50E + 17 to 2.18E + 20 dyne-cm, 31Y-194.3 m, and 6 to 34 HZ, respectively. The seismic wave attenuation through propagation, expressed by a quality factor indicated its frequency dependence with regression relation proportional to Q(p) = 128f(0.58) for P- wave spectra. The low Q(0) (quality factor at reference frequency f(0)) value indicate that Aswan region is a seismically active region. The site responses obtained using the inversion technique show that the stations sites have peak amplitudes in high frequency from 10 to 40 Hz.
机译：确定了阿斯旺宽带地震网记录的310个地震事件的震源参数，其局部震级范围为0.9到3.5。广义反演技术（GIT）假设通过线性最小二乘分析，将参考站点应用于从观测到的位移P波谱中分离出源，站点和路径效应。该反演技术是基于Brune的Ω平方源模型制定的。长周期渐近线和转折频率是实现当前研究目标的两个基本参数。使用来自P波部分的位移震源谱估算震源参数（地震矩，静应力下降，位错面积，拐角频率和震源半径）。所确定的应力降值范围为0.03至2.9 MPa，平均为0.3 MPa。获得的较低的应力降值可能反映出水库诱发的地震具有较低的应力降。应力下降与阿斯旺地区的地震深度没有显着相关性。地震矩，震源半径和转角频率范围分别为1.50E + 17至2.18E + 20达因厘米，31Y-194.3 m和6至34 HZ。用质量因子表示的通过传播的地震波衰减表明，它对频率的依赖性与P波谱的Q（p）= 128f（0.58）的回归关系成比例。低Q（0）（参考频率f（0）处的品质因数）值表示阿斯旺地区是地震活跃地区。使用反演技术获得的站点响应表明，站点站点在10到40 Hz的高频中具有峰值幅度。

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