![]() ![]() Both the 3D velocity model and the geometry of earthquake clusters suggest this structure truncates the Longitudinal Valley Fault north of 23.7° N, separating the northernmost LVF into the shallow and the deep segments. Earthquake clusters associated with this west-dipping fault indicate it develops along the base of high-velocity Central Range metamorphic rocks and is likely branched out from the previously recognized Central Range Fault (CRF). Earthquake focal mechanisms and relocated hypocenters from earthquake clusters suggest a gentle west-dipping fault existing under the Longitudinal Valley and the Coastal Range. ![]() This study uses the 3D crustal velocity model and the relocated earthquake hypocenters, including the 2018–2021 earthquake sequences, to re-assess the seismogenic structures at the northern Longitudinal Valley. ![]()
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