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Since mid-June 1991 , when violent eruptions triggered Mount Pinatubo 's first lahars in 500 years , a system to monitor and warn of lahars has been in operation .
 location: Mount Pinatubo
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: media, plant, vehicle, astronomical object, time, disease, animal, location, person, organization, mythical figure, food, biology, geographical phenomenon, instrument, event 
Text: {0} 
Answer:
 location: Mount Pinatubo