Web Services

Notifications, questions and comments related to using the DMC’s web services

Tags: Web Services

Active Message Threads for March 2013

Chad Trabant
March 27, 2013, 1:43 p.m. - March 28, 2013, 6:13 p.m.
Hello web services users, We are pleased to announce that the IRIS DMC has implemented the International Federation of Digital Seismograph Networks (FDSN) versions of our core web services that support access to time series data, related metadata and event parameters. The equivalent DMC services are now deprecated and will be retired, read more on that below. The FDSN service specification defines an internationally recognized, standard interface. Programs that access data via these FDSN... [more]
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Philip Crotwell
March 13, 2013, 11:18 a.m. - March 18, 2013, 1:24 p.m.
Hi This query (generated by the url builder) returns no events, even though there was a mag 7.6 earthquake in Turkey in that time range. Even odder, there is an origin in the NEIC PDE-M catalog for this event, originId=4908041, but it is not returned. http://www.iris.edu/ws/event/query?starttime=1999-08-17T00:00:00&endtime=1999-08-17T23:59:00&minmag=7&contributor=NEIC+PDE-M&orderby=time&output=xml I am assuming that what happens is that I did not select "includeallorigins", and so this que... [more]
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Philip Crotwell
March 18, 2013, 12:27 p.m. - March 18, 2013, 1 p.m.
Does includearrivals work? I have tried several queries with includearrivals=yes but dont seem to get anything different back? I could be doing something wrong, but... For example this came from the URL builder, but no arrivals: http://www.iris.edu/ws/event/query?starttime=2008-02-27T06:30:00&endtime=2008-03-01T06:30:00&minmag=6&includearrivals=yes&orderby=time&output=xml Philip
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Philip Crotwell
March 18, 2013, 12:04 p.m.
What is the status of serving moment tensors/focal mechanisms via either the web servers or another web service? There were hints back in 2011 that this might be in the works. The docs for the fdsn event service makes no mention of this, so I am guessing lower priority or off the radar? Just curious, Philip
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Philip Crotwell
March 15, 2013, 9:58 a.m.
I suspect this is a bad data issue rather than a web services issue, but... http://www.iris.edu/ws/event/catalogs <Catalogs> <total>6</total> <Catalog>ANF</Catalog> <Catalog>GCMT</Catalog> <Catalog>TEST</Catalog> <Catalog>ISC</Catalog> <Catalog>UofW</Catalog> <Catalog>NEIC PDE</Catalog> </Catalogs> Philip
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Philip Crotwell
March 15, 2013, 9:51 a.m.
So I just stumbled onto this "almost web service" that lists the earliest and latest times for each catalog/contributor: http://www.iris.edu/SeismiQuery/bin/event-inventory.pl This would be really useful for SOD to decide with time ranges should use which catalogs/contributors. Any chance you all are thinking of "web servicing" this functionality? It could be screen-scrapped, but a text or xml format would be easier to parse. thanks Philip
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Philip Crotwell
March 14, 2013, 3:05 p.m. - March 14, 2013, 6:07 p.m.
Is there a way in the event service to query for events that are in the NEIC PDE-W or NEIC PDE-M but not get events that only occur in the NEIC PDE-Q or NEIC ALERT? In other words, I want to process using the weekly or the monthly, but I don't want to use the Q or the ALERT. Some time ago I was told that you cannot specify more than one contributor, which seems to be the case as this query returns no data. So, my guess is that I need to do this as 2 separate queries and merge the results loc... [more]
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Philip Crotwell
March 14, 2013, 1:44 p.m. - March 14, 2013, 3:12 p.m.
Hi So, the event web server returns events in "descending" time order. That makes sense for a person looking at a listing. But a system like SOD that does processing on events, it is much more natural to do the processing in natural time order, ie ascending. Obviously I can flip the order on the client side, so maybe a minor quibble, but it is additional work and it makes it harder to take advantage of the limit/offset functionality to step through a large number of events. Just my $0.02. O... [more]
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Philip Crotwell
March 13, 2013, 2:41 p.m. - March 13, 2013, 11:46 p.m.
Hi The quakeml spec (1.2) says that this depth field in an origin is in meters. depth Depth of hypocenter with respect to the nominal sea level given by the WGS84 geoid (Earth Gravitational Model, EGM96, Lemoine et al. 1998). Positive values indicate hypocenters below sea level. For shallow hypocenters, the depth value can be negative. Note: Other standards use different conventions for depth measurement. As an example, GSE2.0, defines depth with respect to the local surface. If event data... [more]
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