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首页> 外文期刊>Pure and Applied Geophysics >Spatial Variations of Local Magnitude in Earthquakes Recorded in Northeastern Spain
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Spatial Variations of Local Magnitude in Earthquakes Recorded in Northeastern Spain

机译：西班牙东北部记录的地震局部震级的空间变化

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摘要

Since 1984, a seismic surveillance of the Baix Ebre Region (NE of the Iberian Peninsula) and the La Cerdanya Valley (Eastern Pyrenees) has been performed by the Institut d’Estudis Catalans and the Universitat de Barcelona, by means of four digital stations. An investigation of the apparent magnitude has been carried out to explain the observed anomalous differences between the amplitude of the recorded events and their associated magnitude, as given by the different agencies. Calculating the local magnitude with independent attenuation parameters and comparing the obtained results using the different stations, we obtain differences up to 1.0. These differences are interpreted in terms of very local effects and point out the uselessness of some stations to assign magnitudes of local events. Results emphasize that the effectiveness of the trigger algorithms in digital stations rarely depends on the apparent (local) magnitude. As expected, the magnitude sensitivity is related to the values of the station correction terms, meaning that extra information is required for an optimum surveillance of a local area. A 2-D analysis of the distribution of the differences between the computed and reported magnitude shows no significant azimuthal dependence. This indicates that the obtention of a local magnitude scale with an appropriate station correction term related to epicentral distance, results in an important factor to provide magnitude to local events. The obtained results corroborate previous works done at the same area and emphasis is placed on further analysis directed to obtain a better characterization of the local site influence.
机译：自1984年以来，埃斯图迪斯加泰罗尼亚研究所和巴塞罗那大学已通过四个数字站对贝克斯埃伯雷地区（伊比利亚半岛东北部）和拉塞丹尼亚山谷（东比利牛斯山脉）进行了地震监视。已经进行了视在量级的研究，以解释所观察到的记录事件的幅度与其相关量级之间的异常差异，这是由不同机构给出的。用独立的衰减参数计算局部震级，并使用不同的测站比较获得的结果，我们得到的差异最大为1.0。这些差异是根据非常局部的影响来解释的，并指出了某些台站无法分配局部事件的大小。结果强调，数字站中触发算法的有效性很少取决于视在（本地）幅度。不出所料，幅度灵敏度与测站校正项的值有关，这意味着需要额外的信息才能对局部区域进行最佳监视。对计算得出的幅度和报告的幅度之间的差异分布进行二维分析后，没有明显的方位角依赖性。这表明，通过使用与震中距离有关的适当测站校正项来获得局部震级标度，是导致向局部事件提供震级的重要因素。获得的结果证实了以前在同一地区所做的工作，并着重于进一步分析，以更好地表征当地影响。

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  • 来源
    《Pure and Applied Geophysics》 |2005年第3期|515-530|共16页
  • 作者

    Josep Vila; Ramon Macià; Antoni M. Correig;

  • 作者单位

    Departament d’Astronomia i Meteorologia Facultat de Física Universitat de BarcelonaLaboratori d’Estudis Geofísics “Eduard Fontserè” Institut d’Estudis CatalansDepartament d’Astronomia i Meteorologia Facultat de Física UB;

    Laboratori d’Estudis Geofísics “Eduard Fontserè” Institut d’Estudis CatalansDepartament de Matemàtica Aplicada II Universitat Politècnica de Catalunya;

    Departament d’Astronomia i Meteorologia Facultat de Física Universitat de BarcelonaLaboratori d’Estudis Geofísics “Eduard Fontserè” Institut d’Estudis Catalans;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Seismicity; local magnitude; site effects; lateval variations;

    机译：地震;局部震级;场地效应;最新变化;

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