The slow slip aseismic, in the deep part of the tectonic faults is the main mechanism of accumulation of efforts in the engaged area. The deformation areas outside seismic coupling also causes intermittent seismic processes, for example swarms of tremors or earthquakes. Seismic monitoring of these processes allows to study the slow deformation. The phenomenon of episodic slow earthquakes accompanied by tremors is indicative of the heterogeneity of the physical properties of faults. During large subduction earthquakes, such as Tohoku, Japan, 2011 the coexistence of fast and slow processes are manifested by the spatial separation between the sliding areas of high and low frequency, revealed by studies of broadband source. The separation is also evident in the 2015 earthquake in Nepal, at high frequencies located in the deep part of the rupture zone, coinciding with the belt of seismicity background, mechanics and numerical and experimental models of seismic cycle allow us to understand these processes of rupture and its impact on the distribution of the intensity of the damage caused by the quake. In urban areas, new monitoring systems allow us to detect micro-seismicity more fully. This has revealed the existence of very deep earthquakes in the roots of an active fault in Los Angele, in the upper mantle. The unusual features of this deep seismicity can be interpreted in the context of models of rupture in heterogeneous fault areas.
Rupture Processes Bordering Areas of Seismic Coupling
February 10, 2016