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首页> 外文期刊>Bulletin of the International Institute of Seismology and Earthquake Engineering >MOMENT TENSOR AND SOURCE PROCESS OFEARTHQUAKES IN FIJI REGION OBTAINED BYWAVEFORM INVERSION
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MOMENT TENSOR AND SOURCE PROCESS OFEARTHQUAKES IN FIJI REGION OBTAINED BYWAVEFORM INVERSION

机译：波形反演获得的斐济地区矩张量和震源过程

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摘要

We evaluated the quality of the local seismic waveform recorded at Yasawa station established by theMineral Resources Department (MRD, Fiji), and tried to estimate moment tensor solution by usingthis waveform data. We also estimated moment tensor solution and seismic source process by usingteleseismic body wave so as to investigate the faulting system in Fiji region. As for the evaluation ofthe quality of the waveform recorded at the Yasawa station, we found that EW and NS componentswere down frequently, and moment tensor solution obtained by 3 components of the Yasawa station istotally opposite to the Harvard CMT solution. This result may suggest that the polarity of the localseismometer components was in a reverse direction and magnification of the seismometer responseinformation is not correct at this stage. We obtained a consistant result when we divided by -10 toobserved waveform. Moment tensor inversion analysis was also carried out for 30 events by usingteleseismic body-wave downloaded from the IRIS-DMC. Final results are well consistent to HarvardCMT solution. Rupture source process analysis was conducted for the two deep intraslab events thatoccurred respectively along the Tonga Kermedec subduction zone and two shallow depth eventswhich occurred respectively along the transform fault zones. The rupture processes for the two deepearthquakes are characterized by the rupture propagating mainly along the strike of the fault plane.The two shallow events occurred aleng the transition zone also characterized by the rupturepropagating along the strike of the Fiji Fracture Zone but are controlled by the geometry of the fault.
机译：我们评估了由矿产资源部（MRD，Fiji）建立的Yasawa站记录的当地地震波形的质量，并尝试使用此波形数据来估算矩张量解。我们还利用地震体波估算了矩张量解和震源过程，以研究斐济地区的断裂系统。关于对Yasawa站记录的波形质量的评估，我们发现EW和NS分量频繁下降，并且Yasawa站的3个分量获得的矩张量解与哈佛CMT解完全相反。该结果可能表明本地地震仪部件的极性是相反的，并且地震仪响应信息的放大在此阶段不正确。当我们用-10除以观察到的波形时，我们获得了一致的结果。还使用从IRIS-DMC下载的地震体波对30个事件进行了矩张量反演分析。最终结果与HarvardCMT解决方案完全一致。对分别沿汤加克尔梅德克俯冲带发生的两个深板内事件和分别沿转换断层带发生的两个浅深度事件进行了破裂源过程分析。两次深地震的破裂过程的特征是破裂主要沿着断裂面的走向传播。两个浅层事件沿过渡带发生，其特征还在于斐济断裂带沿着破裂的走向传播，但受几何形状控制。故障。

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