In a bonus podcast, Island Conversations host Sherry Bracken talks with USGS Hawaiian Volcano Observatory seismologist Brian Shiro about the July 4 and 5, 2019 earthquakes in Ridgecrest, California (6.4 and 7.1), how they're similar to or different from Hawaii earthquakes, when/how a tsunami from the West Coast of the mainland could be generated, early earthquake warnings, and more, plus an update on Mauna Loa. Air date:  July 23, 2019