Eruptive activity recorded
 with seismometer and single microphone back
 in October 1999 during volcano crisis at Tungurahua Volcano,
 Ecuador. 
  Typical activity was Vulcanian
 in nature, but high level of background seismicity
 inhibited identification of distinct eruptive pulses
 using seismic data alone. 
 Data was recorded 9 km from the volcanic vent.