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Distribution of Seismicity Before the Larger Earthquakes in Italy in the Time Interval 1994–2004

机译:1994-2004年时间间隔内意大利大地震之前的地震分布

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摘要

The Region–Time–Length (RTL) algorithm has been applied to different instrumental catalogues to detect seismic quiescence before medium-to-large earthquakes in Italy in the last two decades. RTL performances are sensitive to the choice of spatial and temporal parameters. The method for automatic parameters selection developed by Chen and Wu has been applied to twelve Italian earthquakes with magnitude greater than 5. The limits of the method in constructing maps of seismic quiescence before the earthquake are demonstrated, and a simple improvement is proposed. Then a new technique, namely RTLsurv, is proposed for routine surveys of the Italian seismicity. RTLsurv has been applied to all the earthquakes with magnitude greater than 4 in the Italian area in the time interval 1994–2004; four different sub-areas have been identified, with different characteristics in the level of recorded seismicity. One subarea—Tyrrhenian Sea—was characterized by a too low level of recorded seismicity for the application of the method. In the other three subareas a seismic quiescence was detected before at least the 66% of the earthquakes with magnitude greater or equal to 4 and all the earthquakes with magnitude greater than 5.
机译:在过去的二十年中,“区域-时间-长度”(RTL)算法已应用于不同的仪器目录,以检测意大利中到大地震之前的地震静息。 RTL性能对空间和时间参数的选择很敏感。 Chen和Wu提出的自动参数选择方法已经应用于12个大于5的意大利地震。该方法说明了构造地震前静态地震图的局限性,并提出了一种简单的改进方法。然后提出了一种新技术,即RTL surv ,用于意大利地震活动的常规调查。 RTL surv 已应用于1994-2004年间意大利地区所有大于4级的地震。已经确定了四个不同的分区,在记录的地震活动水平上具有不同的特征。对于该方法的应用,一个地区(第勒尼安海)的记录地震活动水平太低。在其他三个子区域中,至少在震级大于4的66%的地震和震级大于5的所有地震之前,检测到地震静止。

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