#tectonic plate

• Aseismicity — The structural property or characteristic of a geographical region or tectonic zone of not experiencing significant earthquakes or seismic activity over long periods of time; stable absence of telluric movements. In civil engineering, the term can describe the quality of a site or the behavior of a stable ground that minimizes tectonic risks for built structures.
• Asthenosphere — A layer ofthe solid Earth located in the upper mantle, directly below the lithosphere (at a depth between approximately 100 and 410 kilometers); it is characterized by rocks in a plastic, viscous, and partially molten state due to high temperatures and pressures, allowing the slow movement of overriding tectonic plates through convection currents.