Daftar Isi: The Napa Earthquake, California (M=6; 24/08/2014) - Post-seismic survey report, with special focus on surface faulting

Daftar Isi:

The Napa earthquake (Mw=6; depth 10 km) occurred on the August 24th, 2014 and caused severe damages because of both ground motion and surface displacement. Large strong motion was recorded in the Napa City area (0.4 g), preferentially affecting the pre-Building Code facilities, and damage pattern was also controlled by the 2D geometry of the Napa Basin. This event questions the scaling relationships usually applied in seismic hazard studies to infer magnitude from measurable surface faulting parameters, with high values of maximum displacement (45 cm) and surface rupture length (12.5 km) for such a moderate magnitude. Huge amount of afterslip took place on several sections of the main strand, whereas secondary ruptures occurred more than 2 km off the main segment. The scientific community used a large panel of techniques, from classical field mapping to modern techniques (InSAR, LiDAR), providing an interesting feedback for the study of future earthquakes and the updating of seismotectonic databases (e.g. surface ruptures). Finally, besides these seismotectonic peculiarities of the quake, the regulatory and prevention aftermath will be followed carefully.