Early Stage and Main Ruptures of the 2015 Mw8.3 Illapel, Chile, Megathrust Earthquake: Kinematic Elliptical Inversions and Dynamic Rupture Simulations

Abstract

Modeling the dynamic rupture of such large subduction earthquakes is one of the most important issues for understanding not only the long-term subduction process but also the severe ground motions observed in cities close to rupture zones (Fernandez et al., 2019) and associated tsunami impacts (e.g.,

Afterslip of the Mw 8.3 2015 Illapel Earthquake Imaged Through a Time‐Dependent Inversion of Continuous and Survey GNSS Data

“…This mechanism possibly happened during the Illapel earthquake. Aochi and Ruiz (2021) proposed that the Illapel earthquake started with a foreshock and that the rupture immediately propagated northward, similarly as observed in the back‐projection and the kinematic slip inversions ( e.g. , Melgar et al., 2016).…”

“…This mechanism possibly happened during the Illapel earthquake. Aochi and Ruiz (2021) proposed that the Illapel earthquake started with a foreshock and that the rupture immediately propagated northward, similarly as observed in the back-projection and the kinematic slip inversions (e.g., Melgar et al, 2016). The epicentral area experienced 3-4 m of slip during the first 30 s of the rupture, before reaching the future afterslip area which broke between 30 and 40 s, before propagating further northward and updip.…”

Non‐Linear Vertical Land Motion of Coastal Chile and the Antarctic Peninsula Inferred From Combining Satellite Altimetry, Tide Gauge and GPS Data

“…About 500 km north of the Maule earthquake location, the Mw8.3 Illapel earthquake happened at a depth of 22 km on 16 September 2015 (Lee et al., 2016). This shallow thrust fault ruptured ∼200 km of a subduction zone segment along the Chilean coast between ∼30° and ∼32°S in the high inter‐seismic coupling region (Aochi & Ruiz, 2021). The co‐seismic and post‐seismic deformation driven by these earthquakes have been widely studied using campaign and continuous GPS sites or a combination of GPS and InSAR observations with analytical models (e.g., Duputel et al., 2015; Lorito et al., 2011; Melgar et al., 2016; Moreno et al., 2010; Tong et al., 2010).…”