首页> 外文期刊>Pure and Applied Geophysics >The Tadjena Earthquake (Mw = 5.0) of December 16, 2006 in the Cheliff Region (Northern Algeria): Waveform Modelling, Regional Stresses, and Relation with the Boukadir Fault
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The Tadjena Earthquake (Mw = 5.0) of December 16, 2006 in the Cheliff Region (Northern Algeria): Waveform Modelling, Regional Stresses, and Relation with the Boukadir Fault

机译:2006年12月16日在切尔夫地区(阿尔及利亚北部)的塔德吉纳地震(Mw = 5.0):波形模拟,区域应力以及与布卡迪尔断裂的关系

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摘要

The Cheliff region has experienced some significant earthquakes in the last century (1937, 1954, and 1980). The most destructive one is that of El Asnam on October 10, 1980, Ms = 7.3 (Io = IX), which destroyed the Chlef city (formerly El Asnam) and its surrounding villages. On December 16, 2006 a moderate earthquake (Mw = 5.0) hit the Cheliff region. The maximum observed intensity (Io = V: MSK-scale) was observed at Abou El Hassen, Benaria, Bouzghaïa and Tadjena. No damages or human losses were recorded. Nevertheless, minor cracks on walls of the old school at Tadjena were observed. The point source focal mechanism of the event was determined by inverting the waveforms of three regional broadband stations of the ADSN (Algerian Digital Seismic Network). It corresponds to thrust-reverse faulting with a strike-slip component. The stress tensor obtained by the inversion of the 15 focal mechanisms available in the Cheliff region exhibits a well constrained compression axis σ1 horizontal and trending N145°. The NW dipping nodal plane indicating a NE–SW thrust fault with a right-lateral component (strike, dip, rake = 249, 38, 137) is more compatible with the regional stress tensor than the steep dipping NNE-SSW nodal plane showing reverse faulting with a left-lateral component (strike, dip, rake = 15, 65, 60). Accordingly, the Tadjena moderate size earthquake can be related to the Boukadir active fault bordering the lower Cheliff basin to the north, a situation similar to that of the El Asnam fault bordering the middle Cheliff basin to the north.
机译:切利夫地区在上个世纪(1937、1954和1980年)经历了一些重大地震。最具破坏性的是1980年10月10日的El Asnam,Ms = 7.3(Io = IX),摧毁了Chlef市(以前的El Asnam)及其周围的村庄。 2006年12月16日,切尔夫地区发生中度地震(Mw = 5.0)。在Abou El Hassen,Benaria,Bouzghaïa和Tadjena观察到最大观测强度(Io = V:MSK标度)。没有记录到任何损害或人员损失。尽管如此,在塔杰纳(Tadjena)的那所旧学校的墙壁上仍观察到小裂缝。该事件的点源焦点机制是通过反转ADSN(阿尔及利亚数字地震网络)的三个区域宽带站的波形来确定的。它对应于带有走滑分量的反推断层。通过切利夫地区可用的15个震源机制的反演而获得的应力张量表现出受约束的压缩轴σ1水平为水平,并且趋势为N145°。 NW倾角节点面表明NE-SW逆冲断层具有右向分量(走向,倾角,前倾角= 249、38、137),与陡峭的NNE-SSW节点面表现出反向相反,它与区域应力张量更兼容。左侧故障(打击,下垂,前倾= 15、65、60)。因此,塔德吉纳中度地震可能与北部切尔夫盆地北部接壤的布卡迪尔活动断层有关,情况类似于北部北部切尔夫盆地中部的埃尔阿斯南断层。

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  • 来源
    《Pure and Applied Geophysics》 |2012年第4期|p.677-691|共15页
  • 作者单位

    Centre de Recherche en Astronomie Astrophysique et Géophysique, BP 63 route de l’observatoire, Bouzaréah, Alger, Algérie;

    Laboratoire Géoazur, Université de Nice-Sophia Antipolis, 250 rue Albert Einstein, Bâtiment 4, 06560, Valbonne, France;

    Centre de Recherche en Astronomie Astrophysique et Géophysique, BP 63 route de l’observatoire, Bouzaréah, Alger, Algérie;

    Centre de Recherche en Astronomie Astrophysique et Géophysique, BP 63 route de l’observatoire, Bouzaréah, Alger, Algérie;

    Centre de Recherche en Astronomie Astrophysique et Géophysique, BP 63 route de l’observatoire, Bouzaréah, Alger, Algérie;

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  • 原文格式 PDF
  • 正文语种 eng
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  • 关键词

    Tellian Atlas; waveform modelling; source parameters; Algeria; Cheliff seismicity; focal mechanism; regional stresses;

    机译:Tellian Atlas;波形建模;源参数;阿尔及利亚;Cheliff地震活动度;震源机制;区域应力;

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