Earthquakes in shallow subduction zones account for the greatest part of seismic energy release in the Earth and often cause significant damage; in some cases they are accompanied by devastating tsunamis. Understanding the physics of seismogenic and tsunamigenic processes in such zones continues to be a challenge as well as a focus of ongoing research. In particular, questions that are being addressed include: These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.