Texan Data for Passive Experiments (SEED)

Passive source PASSCAL experiments usually are recorded using Ref-Tek 130 or Quanterra Q330 datalogers, the data recorded in these instruments get converted to SEED format using antelope software for archiving at the Data Management Center (DMC) as a continuous data set. Recently, new instrument configurations, the generation of response files in antelope and the option to archive any sample rate at the DMC had opened new doors for archiving on SEED format data recorded on Ref-Tek 125 (RT125) generally used for data acquisition of active source experiments.

RT125 instruments are an intermediate generation between the previous RT72-07 series and REF_TEK 130 dataloger. Similarities on the data processing are found when processing in mseed and generating the dataless, however there are some differences in the initial processing such as Format Data Conversion (tr2dminiseed), time corrections using clockcor and the Generation of Batch file.

OBJECTIVE

The purpose of this guide is to provide basic instructions on how to proceed when processing data from a PASSCAL or Flexible Array (FA) experiment recorded on  RT125 dataloggers, and how to submit these data to PASSCAL for further archiving at the Data Management Center (DMC).

What do we need to archive? We only archive the dataless or metadata and the miniseed day volumes. Antelope is simply used to get the raw data into mseed format and generate the metadata for the array of stations that conform your temporary network. Miniseed day volumes and metadata are generated using antelope and following SEED format.

In 2008, for the first time PASSCAL processed RT125 data in mseed format  from two experiments in Washington and Nevada (ZK-08 and YD-08) using antelope 4.10.

REQUIREMENTS

Prior to starting this submittal process you should contact the data_group [at] passcal [dot] nmt [dot] edu and complete the steps described below:

Please complete:

1. Mobilization form: http://www.passcal.nmt.edu/forms/mobilization (Network Codes will be assigned after submission of this form)
2. Demobilization form: http://www.passcal.nmt.edu/forms/demobilization, to be completed by the end of the experiment

Please review

1. PASSCAL Data Delivery Policy

Please check

1. That you have the most recent release of Antelope (see BRTT or request from IRIS at: http://www.iris.edu/manuals/antelope_irismember.htm).
2.  That you are running the most recent PASSCAL software package for your platform (see Software Resources).

STEPS IN BRIEF

The main difference when processing data in Antelope from an RT125 datalogger is the conversion from 'Texan Raw Data format' (TRD) to mseed. The remaining steps to create mseed day volumes and a dataless are the same as for the RT130 or Q330 dataloggers. Generating the dataless can be time consuming due to multiple modification in the configuration for each station or the multiple arrangements done with the stations:

1. Data Reduction and Timing Quality Control

   1.  Back up the raw data from the RT125 datalogger
   2. Create an organized directory structure for your data
   3. Data conversion from *TRD files to mseed
   4. Evaluate time quality and time corrections using clockcorr
   5. Modify headers using fixhdr   
   6. Change Endianess and Flag/Shift Timing
   7. Modify default fields on your traces to MSEED format   

1.  Populate the Antelope Database

   1. Create a Batch File
   2. Build the Antelope Database
   3. View your database
   4. Creating mseed day volumes and adding them to your database
   5. Assign calibration values from calibration table to wfdisc
   6. Verify the Integrity of Your Database
   7. Create the dataless SEED volume

1.  Send Data to IRIS/PASSCAL   

   We recommend use of GUI_DoFTP to submit data to the PIC (version 2008.038 or later version).

STEPS IN DETAIL

 For detailed steps on procesing RT125 data into mseed format please downloand the following documentation:

1. Antelope_guide to process RT125 (texan) data into mseed using Antelope
2. Appendix for RT130 datalogger (same as for rt125)