Data and Resources:
The nodal seismic data used in this study are available from the IRIS DMC (dmc.iris.edu) under the network code 8J (doi: 10.7914/SN/8J_2019). The IRIS DMC is supported by the National Science Foundation under Cooperative Support Agreement EAR-1851048. We obtained digital elevation data for Figures 1a and 1c from the GEBCO Compilation Group (doi:10.5285/a29c5465-b138-234d-e053-6c86abc040b9, last accessed August 2021). Geologic map data for Figure 1b and 1c was obtained from the USGS Scientific Investigations map 3340 (https://pubs.er.usgs.gov/publication/sim3340, last accessed August 2021).