Photo Gallery 4_infrasound_sensorModern digital measuring instruments. High-frequency equipmentIn Monitoring Room Technical Support Specialist Speaks into Headset. His Colleagues are Working in the Background.wnrsBromo volcano crater at sunrise in morning mist from mt. Batok summit. wnrs_4gettyimages-968289874-170667adiapo_productsBusy Interior Of Engineering Workshop With Workes