Moment Tensors of Ring‐Faulting at Active Volcanoes: Insights Into Vertical‐CLVD Earthquakes at the Sierra Negra Caldera, Galápagos Islands

Moderate earthquakes (Mw > 5) with moment tensors (MTs) dominated by a vertical compensated-linear-vector-dipole (vertical-CLVD) component are often generated dip slip along curved ring-fault system at active volcanoes. However, relating their MTs to parameters has been proved difficult. The objective of this study is find robust way estimating some based on MT solutions obtained from long-period seismic records. We first model the idealized ring-faulting and show that components representing vertical-CLVD strike-slip mechanisms resolvable deviatoric inversion using waves, whereas dip-slip mechanism indeterminate owing shallow source depth. then propose new method for arc angle orientation two components. For validation, we earthquake occurred during 2005 volcanic activity Sierra Negra caldera, Galápagos Islands. stably determined our estimation consistent geometry identified previous geodetic studies field surveys. also estimate took place 2018 revealing significant differences between in terms direction location. These results usefulness parameters, enabling us examine kinematics structures below volcanoes ring faults distributed globally.