A method for determining significant structures in a cloud of earthquakes
A method for determining significant structures in a cloud of earthquakes
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DOI：
10.1029/96jb03739
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发表时间：
1997-04-10
影响因子：
3.9
通讯作者：
Stewart, RC
中科院分区：
文献类型：
--
作者：
Jones, RH;Stewart, RC
用致震构造来解释震源云并不是一件简单的工作。地震发生的地点存在不确定性，每次地震的不确定性都不一样。因此，不应简单地通过检查来解释数据，因为这在三维数据的情况下是困难的。相反，我们建议使用位置的不确定性作为指导，在处理数据。地震位置在其不确定性或置信度椭球内移动，直到获得地震云的简化图像，然后可以根据某些简化结构（如断层）进行解释。该方法的目的是给出与所有位置和置信度椭球数据一致的最简单的可能结构。该方法适用于三个合成的数据集。这说明了该方法的潜力和局限性。应用到一个真实的地震数据集从拉包尔火山口在巴布亚新几内亚给出了一个图像的火山口环断层，这表明从简单的环断层结构以前假设的偏离。对拉包尔数据的敏感性分析表明，该方法对应用该方法时必须作出的假设并不过分敏感。
The interpretation of a cloud of earthquake hypocenters in terms of causative structures is not a simple task. Locations are subject to uncertainties, which will not be the same for every earthquake. The data should therefore not be interpreted simply by inspection, which is difficult in the case of three-dimensional data anyway. Instead, we propose using the location uncertainties as a guide in processing the data. Earthquake locations are moved inside their uncertainty or confidence ellipsoids until a simplified picture of the earthquake cloud is obtained, which can then be interpreted in terms of some simplified structure such as faults. The aim of the approach is to give the simplest possible structure that is consistent with all the location and confidence ellipsoid data. The method is applied to three synthetic sets of data. These illustrate the potential and limitations of the method. Application to a real earthquake data set from Rabaul Caldera in Papua New Guinea gives an image of the caldera ring fault that suggests departures from the simple ring-fault structure previously assumed. Sensitivity analysis on the Rabaul data shows that the method is not unduly sensitive to the assumptions that have to be made in applying it.