Abstract
AbstractThe characteristics of two inversion techniques, the apparent source time function (ASTF) inversion technique and the direct wave (DW) inversion technique, were compared by applying them to the MW6.3 L'Aquila, Italy, earthquake for its spatio‐temporal rupture process. The ASTF results show that the earthquake consisted of two sub‐events, and the second one caused distinct Doppler effect, indicating a mainly unilateral rupture propagating southeastwards. The DW results in cases that rakes are variable and invariable were in a good agreement with the ASTF results. They all indicated that there were two slip‐concentrated patches on the fault plane. One was around the hypocenter, with the maximum slip of 1.2 m, and another was 5~10 km away from the former in the strike direction, with the maximum slip of 1.0 m. The total rupture duration is about 9.5 s, and the maximum slip‐rate reaches 0.6~0.7 m/s. It should be the quick rupture and the hanging‐wall effect that led the tremendous damage to the L'Aquila city.
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