On 4 July 2019 southern California was rattled by the largest earthquake to occur in the region in nearly 20 yr, a moment magnitude () 6.4 earthquake that occurred near Ridgecrest approximately 200 km north of Los Angeles. It was followed on 6 July by a larger 7.1 earthquake. The distribution of aftershocks made it clear from the beginning that this was a complex earthquake sequence involving rupture on multiple faults. Unraveling the secrets of the sequence, consisting of over 100,000 events, will undoubtedly require years of research. Fortunately, researchers will be enabled...
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