Obspy.iris - issues with "sacpz" and "resp"

Hi all,

Using the obspy.iris Client I can get waveform data ok, and can also get
response info using client.saveResponse ( for both resp and sacpz formats ).

However if I use client.sacpz or client.resp then the same request fails - does anyone have any idea why ??

I think I’m using the latest available obspy.iris ( obspy.iris-0.5.0.dev_r3200 )

My code is as follows :

if name == ‘main’:

client = Client()

t1 = UTCDateTime(2002, 11, 3, 22, 20, 00, 000000)
t2 = UTCDateTime(2002, 11, 3, 22, 30, 00, 000000)
tr = client.getWaveform(“UW”,“LON”,’’,“BHZ”,t1,t2)

The above line works fine

t1 = UTCDateTime(“2002-11-01”)
t2 = UTCDateTime(“2003-01-01”)

available = client.availability(network=‘UW’,station=‘LON’,location=’’,channel=‘BHZ’,starttime=t1,endtime=t2)

The above request works fine

outresp = ‘uw-lon.resp’
outsacpz = ‘uw-lon.sacpz’

The above two lines work fine

sacpz = client.sacpz(network=‘UW’,station=‘LON’,location=’’,channel=‘BHZ’,starttime=t1,endtime=t2)

The above client.sacpz fails, as does a similar client.resp request

Output & Error message from the ‘client.sacpz’ request is as follows :

UW LON – BHZ 2002-11-01T00:00:00 2003-01-01T00:00:00

Traceback (most recent call last):
File “get_LON_example.py”, line 86, in
sacpz = client.sacpz(network=‘UW’,station=‘LON’,location=’’,channel=‘BHZ’,starttime=t1,endtime=t2)
File “/sp/prj/tvz95/mypython/lib/python2.6/site-packages/obspy.iris-0.5.0.dev_r3200-py2.6.egg/obspy/iris/client.py”, line 931, in sacpz
data = self._fetch(url, **kwargs)
File “/sp/prj/tvz95/mypython/lib/python2.6/site-packages/obspy.iris-0.5.0.dev_r3200-py2.6.egg/obspy/iris/client.py”, line 114, in _fetch
response = urllib2.urlopen(req, timeout=self.timeout)
File “/usr/lib64/python2.6/urllib2.py”, line 124, in urlopen
return _opener.open(url, data, timeout)
File “/usr/lib64/python2.6/urllib2.py”, line 395, in open
response = meth(req, response)
File “/usr/lib64/python2.6/urllib2.py”, line 508, in http_response
‘http’, request, response, code, msg, hdrs)
File “/usr/lib64/python2.6/urllib2.py”, line 433, in error
return self._call_chain(*args)
File “/usr/lib64/python2.6/urllib2.py”, line 367, in _call_chain
result = func(*args)
File “/usr/lib64/python2.6/urllib2.py”, line 516, in http_error_default
raise HTTPError(req.get_full_url(), code, msg, hdrs, fp)
urllib2.HTTPError: HTTP Error 400: Bad Request

thanks in advance,


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Hi Stephen,

its a bug in the currently released version of obspy.iris - an empty
location code has to be replaced with a '--' to be understandable from
the IRIS Web service.

For now the following should work:

client = Client()
t1 = UTCDateTime("2002-11-01")
t2 = UTCDateTime("2003-01-01")

Thanks for reporting! I'll fix it later today. We hope to release
newer versions of most modules within the next days. The module
obspy.iris will be one of those.


- --
Dr. Robert Barsch

EGU Office Munich
Luisenstr. 37
80333 Munich

Phone: +49-89-21806549
Fax: +49-89-218017855
eMail: admin@egu.eu