Point process modeling has been implemented to study interaction among seismic patterns for the past several decades. However, integration of geologic variables into point process models has not been fully explored in previous studies. In this study, the magnitude 6.1 earthquake on Jun 30, 1975 and its aftershocks in Yellowstone National Park were studied with point process analysis to identify a suitable model towards revealing the pair-wise point
interaction and its correlation with geologic variables. A Multitype Strauss Process Model was adopted due to its flexibility of incorporating geologic variables into interpoint pattern simulation in quantitative seismology.
The results firstly showed that the Multitype Strauss Process Model can successfully capture the distribution pattern of epicenters under the effect of interaction radii among different types of earthquakes. Secondly, two geologic variables, the distance to faults and earthquake focal depths, can explain the seismic pattern, which are also consistent with the physical mechanisms suggested in previous studies. However, the location of hydrothermal system was found to have little correlation with the earthquake distribution.