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首页> 外文期刊>Acta Geophysica Polonica >SOURCE CHARACTERISTICS AND TECTONIC IMPLICATIONS OF MODERATE EARTHQUAKE, NORTHEASTERN CAIRO PREFECTURE
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SOURCE CHARACTERISTICS AND TECTONIC IMPLICATIONS OF MODERATE EARTHQUAKE, NORTHEASTERN CAIRO PREFECTURE

机译:东北开罗州中度地震的震源特征和构造意义

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摘要

Using local seismograms of the Egyptian National Seismological Network (ENSN), source characteristics of a moderate earthquake M_w=4.5 (28 December 1999) are analyzed. In this analysis, the Empirical Green's Function (EGF) decon-volution technique is applied. The records of an appropriate aftershock are taken as the EGF and are used to deconvolve the mainshock seismograms, thus obtaining a Relative Source Time Function (RSTF) at each station. The deconvolution is performed using P waves in frequency domain. From the time-domain analysis of the RSTF, the resulting source time functions indicate a simple rupture process. The azimuthal dependencies of the RSTF pulse amplitudes and widths are used to estimate rupture velocity and rupture direction for the mainshock. The azimuth of rupture direction is obtained using a global optimization method. We found that the rupture direction of the main event propagated toward S175°E with an averaged rupture velocity around 0.75 Vs. The result obtained for rupture direction is in agreement with one of the nodal planes of focal mechanism. From the rupture directivity analysis, focal mechanism and geological evidence it follows that the investigated event reflects a reactivation of a NW-SE Oligocene deep-seated normal faulting with sinistral movement. Source parameters were estimated using RSTFs of the mainshock, including seismic moment of 2.85 x l0~(15) N·m, fault radius of 344 m, fault length 1460 m, and static stress drop of 3.071 MPa.
机译:使用埃及国家地震台网(ENSN)的当地地震图,分析了M_w = 4.5(1999年12月28日)的中等地震的震源特征。在此分析中,应用了经验格林函数(EGF)反卷积技术。适当余震的记录用作EGF,并用于对主震地震图进行反卷积,从而在每个站获得相对震源时间函数(RSTF)。去卷积是使用频域中的P波执行的。根据RSTF的时域分析,所得的源时间函数表示一个简单的破裂过程。 RSTF脉冲幅度和宽度的方位角依赖性用于估计主震的破裂速度和破裂方向。断裂方向的方位角是使用整体优化方法获得的。我们发现主事件的破裂方向朝S175°E传播,平均破裂速度约为0.75Vs。断裂方向的结果与聚焦机构的一个节点平面一致。从破裂方向性分析,震源机制和地质证据可以得出,所研究的事件反映了西北向东南渐新世深层正断层的左旋运动重新活化。震源参数是利用主震的RSTF来估计的,包括2.85×l0〜(15)N·m的地震矩,344 m的断层半径,1460 m的断层长度以及3.071 MPa的静应力降。

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