catalogues

Question 1

what are the minumum parameters that should be present in an earthquake catalog?

Answer 1

origin time
location (long, and lat, and depth if available)
size and type 
additional useful information:
uncertainties
focal mechanism 
number of stations used for solution
meta data (network agency, references, etc)

Question 2

what are the assumptions of the Poisson assumption?

Answer 2

Stationarity: The rate of occurrence (λ ) is constant (also results in proportionality)
Independence: The number of occurrences in a given interval does not dependent on the number of occurrences in preceeding intervals
Non-simultaneity: The probability of simultaneous occurrences is zero