csspy is a simple package for reading centers for seismic studies event format (v 3.0). csspy is not real polished, nor do I plan to aggressively maintain it, but you may find it useful for extracting event information from the ANF catalog (http://anf.ucsd.edu/tools/events/) as dataframes or obspy Catalog objects.
csppy requires python 3.6. You can install csspy using pip + git
$ pip install git+https://github.com/d-chambers/csspySupposing you have downloaded and extracted the ANF catalog from 2007_08. You should now have a file called "events_usarray_2007_08" in your current directory. As an example we will extract the events associated with the Crandall Canyon mine collapse
from pathlib import Path
import obspy
import csspy
# get a path object pointing to the catalog directory
path = Path("events_usarray_2007_08")
# load data into a dict of dataframes (if you are wanting css 3.0 format)
df_dict = csspy.dir_to_df(path)
# filter by day and location
t1 = obspy.UTCDateTime('2007-08-06')
t2 = obspy.UTCDateTime('2007-08-08')
latmin = 39.4
latmax = 39.53
lonmin = -111.29
lonmax = -111.07
df_dict = csspy.dir_to_df(path, starttime=t1, endtime=t2,
minlatitude=latmin, maxlatitude=latmax,
minlongitude=lonmin, maxlongitude=lonmax)
# convert to an obspy catalog (still a bit rough)
cat = csspy.css_to_catalog(df_dict)
# now you can fill any missing network codes or location codes
network = 'TA'
location = '--'
cat = csspy.set_seed_defaults(cat, network=network, location=location)
print(cat)
cat.plot(projection='local')
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