# EARTHWORM Status Report

##### `Alex Bittenbinder (alex@gldage.cr.usgs.gov) May. 19, 1998`

### RECENT DEVELOPMENTS:

- RefTek Interface: RefTek has issued the following announcement:

  May 13, 1998

  New `EARTHWORM` Development Partner...

  Refraction Technology, Inc. (REF TEK) of Dallas, TX has signed on as the latest `EARTHWORM` development partner. REF TEK intends to develop interface software that will allow REF TEK products to source data to `EARTHWORM` via industry standard protocols and interfaces.

  Specifically, REF TEK has contracted with David Chavez of Engineering Services & Software to write a REF TEK data source module for `EARTHWORM` that will link the REF TEK Protocol (RTP). RTP is designed to provide an error-free, ordered transport over UDP/IP/PPP data links. This enables a computer running `EARTHWORM` to communicate with a REF TEK DAS via asynchronous serial ports on the local computer or via Ethernet through asynchronous serial ports on a Cisco 25xx router. This data source module will integrate any Ref Tek 72 series DAS equipped with an RT422 Error Correcting Communications (ECC) Card with the `EARTHWORM` system. The RT422 ECC Card communicates with the central computer using RTP encapsulated within UDP/IP/PPP over a asynchronous serial interface.

  The initial project is expected to be complete by the end of June, 1998 with the delivery of 20 systems to India. Following the initial project, REF TEK intends to port the DAS serial code to other products including its 112 Modem Interface. This will allow network operators who are currently using REF TEK Radio Modem telemetry to source data to `EARTHWORM`.

  For more information contact Alex Bittenbinder at alex@gldage.cr.usgs.gov, or Paul Passmore at p.passmore@reftek.com.

- Module release scheme: New modules are coming off the assembly lines too fast for our existing release mechanism. Producing a new version of `EARTHWORM` for each module would require a lot of installing, which is painfull at best. After some discussions, we've done the following:

  On the public FTP site on ghtftp, there is now the directory. ftp://ghtftp.cr.usgs.gov/pub/OUTGOING/earthworm. This will contain the source and makefiles for modules which are not included in the last release, but which have been tested and are available for use.

- EvansTrig: The venerable long-period trigger algorithm has been ported into a contemporary `EARTHWORM` module. The previous version, consisting of 'lptrig' and 'trigassoc' predated the current trace data format.

- Compress_UA: The BRTT compression algorithm has been incorporated into the modules 'compress_UA' and 'decompress_UA'. The modules seem to have done well in tests between Menlo Park and Fairbanks.

- CarlTrig: The code originally written by Brian Moon of PNL has been modified and debugged by Pete Lombard of UofW and is currently under extensive tests at the UofW. It is being run in parellel with the UW `SUNWORM` trigger which uses the orginal Carl Johnson STA/LTA-subnet trigger algorithm tuned to be very sensitive to even very small earthquakes. The tests are indicating that the new `EARTHWORM` version of CarlTrig performs as well or better than the original. As soon as the documentation and a distribution version of the code is complete it will be available for general use. (within a week or so).

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