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首页> 外文期刊>Journal of Volcanology and Geothermal Research >Seismic source mechanisms of tremor recorded on Arenal volcano, Costa Rica,retrieved by waveform inversion
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Seismic source mechanisms of tremor recorded on Arenal volcano, Costa Rica,retrieved by waveform inversion

机译：哥斯达黎加阿雷纳尔火山记录的地震震源机理，通过波形反演得到解决

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摘要

Moment tensor inversions of volcanic tremor are synthetically tested and subsequently applied to a dataset recorded on Arenal volcano in 2005. We selected 15 harmonic tremor events showing an emergent but very clear onset with a fundamental frequency range of 0.8-1.5 Hz. These events constitute an excellent opportunity to broaden our knowledge of tremor generation models. The inversions were performed for a common source location, the position of which was retrieved through the evaluation of the joint probability density function of the misfit values obtained by the moment tensor inversion of all the events and all predefined source locations (grid search). Events are located beneath the summit crater, in a shallow position. The inversion procedure was tested through the use of synthetic tremor, generated using full wavefield numerical simulations. The maximum amplitude decomposition method is used to analyse the solutions of the synthetic tests. The results highlight the stability of the moment tensor solution when the whole length of the signal is used in the inversion procedure. Hence the whole length of the tremor is utilised to retrieve the source mechanism generating the 15 tremor events. A sliding window is utilised to investigate the time variability of our solution. A crack dipping 20° to the North-Northeast is reconcilable with all 15 tremor events. This mechanism is found to be constant for the entire length of each tremor and for different events.
机译：对火山震颤的矩张量反演进行了综合测试，然后将其应用于2005年在阿雷纳尔火山上记录的数据集。我们选择了15个谐波震颤事件，这些事件显示出一个非常清晰的发作，但基本频率范围为0.8-1.5 Hz。这些事件为扩展我们对震颤发生模型的知识提供了极好的机会。对公共源位置执行反演，其位置通过对所有事件和所有预定义源位置的矩张量反转获得的失配值的联合概率密度函数求值来检索（网格搜索）。事件位于山顶火山口下方，处于较浅的位置。通过使用合成震颤测试了反演程序，合成震颤是通过全波场数值模拟生成的。最大幅度分解法用于分析综合测试的解。当信号的整个长度用于反演过程中时，结果突出了矩张量解的稳定性。因此，利用震颤的整个长度来检索产生15个震颤事件的源机制。利用滑动窗口来调查我们解决方案的时间变化。向北倾斜20°的裂缝与所有15次震颤事件是一致的。发现该机制对于每个震颤的整个长度以及对于不同事件都是恒定的。

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    R. Davi; G.S. OBrien; L.De Barros; I. Lokmer; C.J. Bean; P. Lesage; M.M. Mora; G.J. Soto;

  • 作者单位

    Seismology and Computational Rock Physics Laboratory, School of Geological Sciences, University College Dublin, Belfield, Dublin 4, Ireland;

    Seismology and Computational Rock Physics Laboratory, School of Geological Sciences, University College Dublin, Belfield, Dublin 4, Ireland Complex and Adaptive Systems Laboratory (CASL), University College Dublin, Belfield, Dublin 4, Ireland;

    Seismology and Computational Rock Physics Laboratory, School of Geological Sciences, University College Dublin, Belfield, Dublin 4, Ireland;

    Seismology and Computational Rock Physics Laboratory, School of Geological Sciences, University College Dublin, Belfield, Dublin 4, Ireland Complex and Adaptive Systems Laboratory (CASL), University College Dublin, Belfield, Dublin 4, Ireland;

    Seismology and Computational Rock Physics Laboratory, School of Geological Sciences, University College Dublin, Belfield, Dublin 4, Ireland Complex and Adaptive Systems Laboratory (CASL), University College Dublin, Belfield, Dublin 4, Ireland;

    ISTerre, CNRS, Universite de Savoie, 73376 Le Bourget-du-Lac Cedex, France;

    Escuela Centroamericana de Geologia, Universidad de Costa Rica, Ciudad Universitaria Rodrigo Facio, San Pedro de Montes de Oca, 214-2060 San Jose, Costa Rica;

    Area de Amenazas y Auscultacion Sismica y Volcanica, Instituto Costarricense de Electricidad, Apdo. 10032-1000, San Jose, Costa Rica;

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  • 正文语种 eng
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  • 关键词

    arenal volcano; tremor; moment tensor inversion; source mechanisms;

    机译：阿雷纳尔火山;震颤矩张量反转源机制;

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