The IRIS DMC: Global Real-Time Collection and Distribution of Seismological Data and Products

Rick Benson, Tim Ahern IRIS Data Management Center

DMC Holdings & Collaborators Permanent & Temporary Networks

The IRIS DMC is the primary archive for all International FDSN data, IRIS GSN & PASSCAL, and spans over 40 years of digital seismic data. In addition, the archive is host to all USArray, PBO and SAFOD data and products, and regional networks within the US and from abroad.

All of this data is managed in uniform repositories with all other time-series data, including a completely automated offsite backup system located in Socorro, NM. For the user this means that all of these data are seamlessly available using the DMC’s access methods (see handouts).

Current Real-Time sites (Oct 2008)

A perpetual data management facility providing waveform and parametric data from 1960’s to current real time access

Access Software

The“mousepad” shows all the data discovery options. You can click on content and get linked to information about each application or repository.

Read all about it at

http://www.iris.edu/news

/newsletter/vol9no3/page2.htm

Archive QC & Distribution Statistics

Quality Control

In addition to traditional archive management and data access, the DMC continuously applies Quality Control (QC) techniques to ALL real-time data. This QC effort is divided into two categories: • Automated Techniques The DMC’s QUACK system makes automated QC measurements on all data arriving at the DMC as real-time streams. The measurement results are publicly available via QUACK’s web interface.

www.iris.edu/servlet/quackquery/

JWEED

, a sophisticated data delimiting request tool to help gather event data & generate a request for accompanying seismic data. Watch an online tutorial at http://www.iris.edu/tutorials/jweed/ Power spectral densities (PSDs) are also generated for near real-time data and stored as probability density functions (PDFs) (McNamara and Buland, 2004). They are viewable through QUACK and during manual waveform review.

1742 Stations 6475 Channels 71 Networks

GMS: IRIS Google Mapping Service Discover real-time station/channel information through a Virtual Network @ http://www.iris.edu/gmap/_REALTIME

SPADE

archives products like all phase picks from the USArray network.

Refer to http://www.iris.edu/data/dmc seedlink.htm

• Manual/Observational Techniques The manual QC of USArray data is performed, as the data is received, by DMC analysts who • review raw waveforms • verify sensor polarity • review metadata • compare waveforms with synthetics • analyze background noise and • log Data Problem Reports 15 Gb are archived annually, with 42 Tb getting sent to users- illustrating a very active archive.

This map displays ALL stations within the DMC holdings, 1960-2009. It also Illustrates how you can use URL path names as parameters to generate your own maps, by time or space. Read help on http://www.iris.edu/gmap This map is http://www.iris.edu/gmap/?timewindow=1960/6/1-2008/12/31&sidebar=0 You can access

all

real-time data using numerous protocols using client software, and monitor all data feeds with the Bud_Monitor.

Refer to

http://www.iris.edu/data/dmc-seedlink.htm

& http://www.iris.washington.edu/bud_stuff/dmc/bud_monitor.ALL.html