Meet errors when using "Massdownloader" to download wavforms

Hi All,

Some errors arise when I use massdownloader, which causes the data to be incomplete. Can I prevent these issues and download all the data? If not, are there any ways to print out the messages about the missing data (e.g.,. Thank you! I attached my code and errors below.

import obspy
from obspy.clients.fdsn.mass_downloader import RectangularDomain, \
    Restrictions, MassDownloader

domain = RectangularDomain(minlatitude=42, maxlatitude=52,
                           minlongitude=-132, maxlongitude=-120)
# Define dt = 1 week = 7 days * 24 hrs * 60 mins * 60 seconds
dt = 7 * 24 * 60 * 60 + 2 * 60 * 60

# ====================Loop through each mainshock===========================
for i in data:
    event_time = obspy.UTCDateTime(i[1])
    restrictions = Restrictions(
        starttime=event_time - dt,
        endtime=event_time + dt,
        # Chunk it to have one file per day.
        # Considering the enormous amount of data associated with continuous
        # requests, you might want to limit the data based on SEED identifiers.
        # If the location code is specified, the location priority list is not
        # used; the same is true for the channel argument and priority list.
        network="NV,OO", channel="EHZ,HHZ",
        # The typical use case for such a data set are noise correlations where
        # gaps are dealt with at a later stage.
        # Same is true with the minimum length. All data might be useful.
        # Guard against the same station having different names.

    # Restrict the number of providers if you know which serve the desired
    # data. If in doubt just don't specify - then all providers will be
    # queried.
    mdl = MassDownloader(providers=["IRIS"]), restrictions, mseed_storage="waveform",

Most of time, it can download waveforms successfully, but sometimes, three types of errors arise which are:

obspy.clients.fdsn.mass_downloader - ERROR: Client 'IRIS' - Unknown Error (URLError): <urlopen error [Errno -3] Temporary failure in name resolution>
obspy.clients.fdsn.mass_downloader - ERROR: Client 'IRIS' - timed out
obspy.clients.fdsn.mass_downloader - ERROR: Client 'IRIS' - Unknown Error (URLError): <urlopen error [Errno -2] Name or service not known>

Thank you for your help!

Seems like network issues on your end. Name resolution problem means your computer has trouble connecting to your DNS which it does to ask which IP address to contact when looking for

Depending on what your setup is (private, or office network) you could talk to your network admin, or maybe if you are on wireless internet, switch to wired.

Ok! Thank you for your kind help!