Task 5: Moderate-Large Magnitude Scaling

In the last few years, there have been some moderate and major shallow crustal (i.e., non-subduction type) earthquakes in California and other active tectonic regions throughout the world that can be used to verify and/or enhance the current NGA West models. Examples of such events are the 2004 Pakfield (California) earthquake as well as recent events in Japan, Italy and China with magnitudes as large as 7.9. These new recordings can serve to validate the large-magnitude scaling characteristics of the NGA West models. This task will collect recent ground motion recordings and corresponding metadata and use it to verify the current NGA West models or recommend where these models can be improved. For the purpose of this task, we limit a lower bound magnitude 6.0 for the collection and analysis of “moderate and large magnitude” earthquakes.