We describe a modification to the collapsing method, a technique that aims to find the simplest structures in a cloud of microearthquakes by utilizing the statistical uncertainties in the data. In the modified collapsing method, the movements of the locations are dependent on the shape of the distribution of the locations within the confidence ellipsoid, and not just the position of the center of gravity, as is the case in the original method. Additionally, whereas the original collapsing method implicitly assumes that all locations belong to point structures, in this modified version three types of structure are considered: point, line, and plane. Principal component analysis of the locations is used to evaluate to which type of structure each location most probably belongs. The modified technique has been applied to microseismic events associated with hydraulic stimulation at the Fenton Hill HDR Field, New Mexico, and known small-scale structures were imaged. [References: 8]
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机译：我们描述了崩溃方法的一种修改，该方法旨在通过利用数据中的统计不确定性在微震云中找到最简单的结构。在改进的折叠方法中，位置的移动取决于置信椭圆体中位置的分布形状，而不仅是重心的位置，这与原始方法一样。另外，虽然原始的折叠方法隐式地假定所有位置都属于点结构，但在此修改版本中，考虑了三种类型的结构：点，线和平面。位置的主成分分析用于评估每个位置最可能属于哪种类型的结构。修改后的技术已应用于与新墨西哥州Fenton Hill HDR油田水力刺激相关的微地震事件，并对已知的小规模结构成像。 [参考：8]
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