The NCEDC and Event analysis portion of the
	CISN Northern CA Management Center
		Last updated:	2003/08/08

The NCEDC Archive and Event Analyis portion of the CISN Northern CA Management
Center can potentially be decoupled from the major revisions of the real-time
portion of the northern CA center.

IV.  NCEDC functions:

All events located by the picker/binder system in northern California are
currently being entered into a CISN schem database at the UCB/BSL, and are
being transmitted to the NCEDC by database replication.  This provides the
foundation for implementing an event waveform acquisition system and
analysis system.

1.  Waveform archiver:

The waveform archiver at the NCEDC will use the request cards in the NCEDC
master database to collect waveforms from the waveservers.  When a waveform
has been successfully retrieved, it will be written to an event directory, and
the waveform description and waveform association for the event will be
entered into the database.

Work required:

    1.  Subnet triggers:  

	Subnet triggers from the NCSN/EW system are currently associated with
	binder events (if possible) by the NCSN.  Unassociated events would
	have to be sent to the BSL and entered into the NCEDC database.  This
	could be before or after the hypocenter->event association performed
	by NCSN.  [If sent before, the NCEDC would have to implement the
	association.]  The subnet triggers would get entered as both a subnet
	trigger and a new event with an NCEDC-assigned eventid.

    2.  Archiving rules:

	Rules for what data channels should be archived for hypocenter and
	subnet events.  These rules must satisfy the needs of the entire
	analysis system:
		event relocation.
		coda decay for coda magnitude.
		amplitude and magnitude computation.
		moment tensor.
		finite fault.

	TriNet has 2 different request card generation programs:  one for
	hypocenter (binder) events, and one for subnet trigger events.

    3.	Channel naming convention:

	The phase data from the NCSN currently uses a combination of
	USGS and SEED channel names.  If we want to use SEED channel
	names for waveforms, picks, and amps, we will have to convert
	the USGS channel names to SEED channel names at the NCEDC.
	This will require a rename table that contains:
		Raw channel name
		SEED channel name	

	If the waveforms are to be archived with SEED channel names, the
	waveform archiver will have to be modified to have access to a table
	with the following info:
		Raw channel name
		SEED channel name	
		Waveform server names

	There will also have to be a table that contains info such as:
		Waveform server name
		Waveform server type
		Waveform server IP and port #.

2.  Event analysis:

The event analysis tool jiggle will review the events in the NCEDC database
that were generated by the master RTSP system.  The event review can be
performed on any of the NCEDC multi-master replicated databases, but only
one database should be designated as the review database at any time.

Waveforms for event review will be retrieve from the NCEDC master waveform
archive at UCB.

Work required:

    1.	Jiggle:

	Install jiggle to work with events at the NCEDC.

    3.	Northern CA magnitudes:

	Install Md software into jiggle.

    2.	Performance testing:

	Test performance of jiggle over the network to USGS/MP.


3.  Event catalog:

The event catalog is a natural by-product of performing event analysis
at the NCEDC.

4.  Waveform distribution:

The SEED waveform archive will be automatically collected and associated
with the events in the catalog.  Event waveforms can be distributed
in SEED (and other) formats with standard SEED channel names.