How many seismic stations are needed to determine the location of an earthquake's epicenter?

Pls pls pls choose a city in ecuador, peru, or bolivia. look up all the information you can find about it. then write about the city of your choice in a report of 150 words. after you have finished your writing assignment, review it and correct any errors you find in punctuation, grammar, spelling, and the way you write your sentences. can you choose words with more exact meanings or more vivid descriptions?