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首页> 外文期刊>Bulletin of earthquake engineering >The 2011 Lorca seismic series: Temporal evolution, faulting parameters and hypocentral relocation
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The 2011 Lorca seismic series: Temporal evolution, faulting parameters and hypocentral relocation

机译：2011年的洛尔卡地震系列：时间演化，断层参数和震中重定位

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The Lorca 2011 seismic series was recorded by an unprecedented set of high quality on scale broadband seismograms and strong motion accelerograms. The waveforms from permanent and temporary broadband seismic networks deployed in the region by different institutions allowed to invert regionalmoment tensor for the fore, main and largest aftershock of the complete seismic sequence. Using double-difference algorithm we have performed a precise relocation of the seismic series, where body wave travel times from strong ground motion accelerogramswere included in the data set. Regionalmoment tensor inversion for the three main events show similar oblique-reverse faulting regime with a northeast-southwest fault orientation. The scalar seismic moment, moment magnitude and focal depth retrieved from the inversion yield the following values for each event: Mo = 6.5×10~(16) Nm(Mw=5.2) for the mainshock, Mo = 9.6×10~(15) Nm (Mw=4.6) for the foreshock and Mo = 7.3×10~(14) Nm (Mw=3.9) for the large aftershock. The centroid depths range between 4 and 6 km. The double-difference relocation of the seismic series shows significant epicentral differences with the preliminary routine location. The epicentral solutions given by this relocation show a seismic sequence distributed following a NE-SW strike, subparallel to the Alhama de Murcia fault and compatible with the faulting parameters inverted from the moment tensor analysis. The hypocenters of the series generate a subvertical trend in depth distribution, being concentrated between 2 and 6 km. The depth distribution of the main events, which range from 4.6 to 5.5 km, is in good relationship with the faulting and depth parameters deduced from the moment tensor inversion technique. The regional moment tensor solutions for the three largest earthquakes, the epicentral distribution and the focal depths show good relationship with the surface geometry and tectonic regime of the Alhama de Murcia fault. The stress drop deduced for the mainshock gives a value ranging between 58 and 85 bars, which does not support the idea of a high stress drop release as a main factor contributing to the high ground acceleration recorded at Lorca. The PGA values observed at Lorca, which contributed to the high damage independently of structural deficiencies, could be generated mainly by shallowness and proximity to the seismic source together with a directivity effect in the seismic radiation.
机译：洛卡（Lorca）2011年地震系列记录了前所未有的高质量记录，包括比例尺宽带地震图和强运动加速度图。不同机构在该地区部署的永久和临时宽带地震网络的波形允许反转整个地震序列前，主要和最大余震的区域矩张量。使用双差算法，我们对地震序列进行了精确的重定位，其中数据集中包含了来自强地面运动加速度图的体波传播时间。三个主要事件的区域矩张量反演显示出类似的斜逆断层形态，具有东北-西南断裂方向。从每个反演中得到的标量地震矩，矩量和震源深度对于每个事件产生以下值：主震的Mo = 6.5×10〜（16）Nm（Mw = 5.2），Mo = 9.6×10〜（15）前震为Nm（Mw = 4.6），大余震为Mo = 7.3×10〜（14）Nm（Mw = 3.9）。重心深度在4至6 km之间。地震序列的双差重定位与初始常规位置显示出明显的震中中心差异。通过这种重定位得到的震中解显示出一个地震序列，该地震序列是在NE-SW走向之后分布的，与Alhama de Murcia断层平行，并且与从矩张量分析中求得的断层参数兼容。该系列的震源在深度分布上产生了一个垂直的趋势，集中在2至6 km之间。主要事件的深度分布范围在4.6至5.5 km之间，与矩张量反演技术推导出的断层和深度参数有很好的关系。三大地震，震中分布和震源深度的区域矩张量解与Alhama de Murcia断层的表面几何形状和构造体制具有良好的关系。为主震推算出的应力降给出的值在58至85 bar之间，这不支持将高应力降释放作为导致洛尔卡记录的高地面加速度的主要因素的想法。在洛尔卡（Lorca）观测到的PGA值，无论结构缺陷如何，都是造成高破坏的主要原因，主要是由浅度和靠近地震源以及地震辐射的方向性效应产生的。

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