High frequency sources controls strong motion of Mw 8.8 Maule 2010 earthquake

The Mw 8.8 Maule earthquake occurred in Central Chile is the largest event recorded instrumentally since Mw 9.5 Valdivia 1960 mega-thrust earthquake. Many authors obtained rupture models for this earthquake using low-frequency data providing a general image of its kinematic rupture. The high-frequency domain is poorly constrained. The seismic rupture images of Maule earthquake do not reproduce the high frequency burst observed in the strong motion recorded in the epicentral zone. We simulate the three components of accelerograms for 10 stations using a stochastic method that allow us to reproduce horizontal and vertical synthetic records. We include a finite fault model that incorporate two strong motion high frequency zones (SMGA). From each sub-fault we considering incident and azimuthal angles arrive to each station, also free surface, energy partition, radiation patterns, stress drop and dynamic frequency corner for sources effect. Additionally, we consider geometrical spreading and anelastic attenuation for path effect and soil amplification transfer functions of P, SV and SH waves that considered site effect. Our results shows that the SMGA controls the shape of surface accelerograms, similar to observed by Tohoku-Oki 2011 mega-thrust earthquake in Japan. The Maule SMGA are localized east of the hypocenter, in the northern zone of the rupture in deeper segment of the plate interface. We observed that recorded accelerograms have an important influence of the shallow soil deposits. Our simulated acceleration shows similarity in time and frequency domain for period less than 1 s.