资源环境科技发展态势分析平台

The May 15, 2020 Monte Cristo Range M_w 6.5 earthquake occurred in the northeast of the Mina deflection, which accommodates approximately a quarter of the relatively dextral motion between the Pacific and North American plates. The Monte Cristo Range event provides an opportunity to study the present‐day regional deformation mechanism and active tectonics. In this study, we investigated the source rupture process of the event using joint inversion of interferometric synthetic aperture radar and broadband seismic data. We found that the rupture propagates almost simultaneously on two main segments, however, the fault motion changes from the predominantly sinistral slip near the epicenter on the eastern segment to the oblique slip on the western segment, with a maximum coseismic slip of 0.8 m. Our results suggest that the accommodation of slip transfer localized in the northeastern Mina deflection tends to transform from the wrench‐ to extension‐dominated transtension.