Overview:

ADEPT consists of three main modules:

The Events module interrogates the USGS global earthquake catalog, and creates a database entry for any event greater than M5.9, occurring after January 01, 2000 and more than 45 days ago. The 45 days allows time for the event location agencies to revise recent earthquakes before we process them.

For each event, the Channels module walks through the list of available data centers and interrogates each data center to find what broadband network/station/location/channel combinations are listed as available during that event. Note that there might not be data for each channel in the database, as there is considerable duplication between data centers, some stations might be under a data embargo, and some stations might be temporarily out of service.

The Data module requests 2 hours of data for all listed channels for each event from each data center; all requested data begins at the event origin time. Downloaded data are processed to remove the instrument response to displacement, reduce the data rate to 20 samples/sec, and if possible rotate the resulting 3-channel data to the RTZ reference frame. Data are stored in .sac file format.

Each event is assigned an event name as the event date/time in YYYYMMDDHHmm format. All data files are stored in a RAID array, in the /RZ/adept/YYYYMMDDHHmm/ directory for each event.

The system generates YYYYMMDDHHmm.event and YYYYMMDDHHmm.station files for each event, with metadata for the event and for each station recording data. The .event and .station files are stored in /RZ/adept/Info/, and are linked to each event directory.