Seismic activity triggered by stress changes after the 1978 events in the Asal Rift, Djibouti
Seismic activity triggered by stress changes after the 1978 events in the Asal Rift, Djibouti
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1978 年吉布提阿萨尔裂谷事件后应力变化引发的地震活动
DOI：
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发表时间：
1996
期刊：
影响因子：
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通讯作者：
I. Manighetti
中科院分区：
文献类型：
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作者：
E. Jacques;G. King;P. Tapponnier;J. Ruegg;I. Manighetti
在1978年11月阿萨尔裂谷发生一系列地震之后，对堤坝就位和相关断层造成的变形进行了大地测量，并使用了地球物理数据。利用这一信息，我们计算了由此产生的库仑应力变化，它可以解释的特点，分布的地震活动，在未来六个星期。随后，又发生了一次大地震。当这个事件被包括在模型中时，预测了未来4年内半径为40公里的所有地震活动的分布。该研究证实，库仑应力增加到0.3巴就足以引发地震，并表明堤坝和断层滑动可以导致应力变化，影响广泛地区的地震活动性分布。
Following a sequence of earthquakes in the Asal Rift in November 1978, the deformation resulting from dyke emplacement and associated faulting was measured geodetically and using teleseismic data. Using this information we have computed the resulting Coulomb stress changes, which can explain the features of the distribution of seismicity for the following six weeks. A further major shock then occurred. When this event is included in the modelling, the distribution of all the seismicity within a radius of 40 km in the following 4 years is predicted. The study confirms that increases of Coulomb stress as small as 0.3 bars are sufficient to trigger earthquakes and shows that dykes as well as fault slip can result in stress changes that influence the seismicity distribution over a broad region.