DHI Servers

The IRIS DHI Servers utilize CORBA's Interface Definition Language (IDL) to describe how DHI clients can talk to the servers.

The current IDL can be downloaded from USC. USC also has provided helpful supporting information about DHI (also referred to by its previous name FISSURES). For people thinking about creating their own servers, we'd like to suggest making use of USC's Cormorant framework.

If you are interested in more background on the inception of FISSURES/DHI, please consult the following write-up from December 2000.

DMC Servers

Network Server

The Network Server provides information about networks, stations, sites, channels, and responses. There are two main ways to retrieve network/station/location/channel data - for a known real or virtual network via NetworkFinder or based on a station/channel's location via NetworkExplorer.

Most client applications will use either this server or the Event server before going after seismograms.

Event Server

Event meta-data, including event origins, locations, and magnitudes from NEIC and ISC event catalog, is accessed via the Event Server. Event queries may contain parameters such as a latitude/longitude range, point/distance range, magnitude range, time period, catalogs and contributors. In addition, known catalogs and contributors can be requested.

Seismogram Servers

These servers provide for the retrieval of seismograms from the IRIS DMC.

IRIS Servers:

IRIS_DataCenter

The IRIS_DataCenter is the primary source of waveform data at the DMC. The DataCenter accesses data that is either in the Tier 1 RAID (which has almost all the data managed by the IRIS DMC) as well as data we have received in near real time in the BUD System. With the exception of Tier 2 data, the IRIS_DataCenter provides access to all SEED data the DMC has.

IRIS_BudDataCenter

Use the BudDataCenter directly if you know that you only want a current data stream since it is a little faster than the IRIS_DataCenter. There is approximately a 6 week moving window of data available in the BUD. This varies slightly from station to station. Use this server if you want to have seismograms streaming onto your computer.

IRIS_PondDataCenter

The PondDataCenter contains windows of data around significant earthquakes, normally those of magnitude 5.5 and larger. Data from recent events are extracted from the BUD system and placed together in a SPYDER® product. SPYDER® products are available within a few hours of an earthquake. FARM products are produced 5-6 weeks behind real time and a contain Quality Assured and Real Time data from the Tier 1 Archive at the DMC. FARM products contain waveforms of the best quality at the DMC and are usually reviewed for quality either by analysts at Data Collection Centers or Network Operation Centers or by automated methods at the DMC.

IRIS_ArchiveDataCenter

The ArchiveDataCenter can be used to access IRIS's tier2 data. Tier2 data are data streams which are very large in volume, infrequently accessed or both. Examples of data stored in Tier2 include 4kHz SAFOD data and high sample rate engineering data.

DHI Clients

Client applications using these servers are described on the DHI Clients page.

Server Status

To check on the status of any of the servers, please see the Wily status page at http://www.seis.sc.edu/wily/Check

IRIS_DataCenter	The IRIS_DataCenter is the primary source of waveform data at the DMC. The DataCenter accesses data that is either in the Tier 1 RAID (which has almost all the data managed by the IRIS DMC) as well as data we have received in near real time in the BUD System. With the exception of Tier 2 data, the IRIS_DataCenter provides access to all SEED data the DMC has.
IRIS_BudDataCenter	Use the BudDataCenter directly if you know that you only want a current data stream since it is a little faster than the IRIS_DataCenter. There is approximately a 6 week moving window of data available in the BUD. This varies slightly from station to station. Use this server if you want to have seismograms streaming onto your computer.
IRIS_PondDataCenter	The PondDataCenter contains windows of data around significant earthquakes, normally those of magnitude 5.5 and larger. Data from recent events are extracted from the BUD system and placed together in a SPYDER® product. SPYDER® products are available within a few hours of an earthquake. FARM products are produced 5-6 weeks behind real time and a contain Quality Assured and Real Time data from the Tier 1 Archive at the DMC. FARM products contain waveforms of the best quality at the DMC and are usually reviewed for quality either by analysts at Data Collection Centers or Network Operation Centers or by automated methods at the DMC.
IRIS_ArchiveDataCenter	The ArchiveDataCenter can be used to access IRIS's tier2 data. Tier2 data are data streams which are very large in volume, infrequently accessed or both. Examples of data stored in Tier2 include 4kHz SAFOD data and high sample rate engineering data.