The trumpeter and composer Samantha Boshnack isn’t a geologist by trade, but she certainly thinks a lot about earthquakes and volcanoes. Over the past 15 years, while living in her adopted hometown of Seattle, Boshnack has hiked the environs of Washington’s Mount Rainier and Mount St. Helens with a kind of unnerved fascination. During her travels in places like Mexico and Indonesia, she’s made a point to visit the storied volcanic sites. Throughout her journeys, a couple of questions have persisted: What causes these astounding landscapes and events, and how are they all connected? And how can these vistas be so unspeakably beautiful yet also harbor such a profound potential for catastrophe?