Data

Leap Second's effect on EPIC RT-130 and Q330

Summary:

Q330:

Data time starting at 2017:001:00:00:00 is +1 second from truth for 1-2 minutes (seen in controlled tests) until a clock correction, followed by a gap of 2-40 seconds per channel depending on sample rate.

RT-130:

Data time starting at 2017:001:00:00:00 is +1 second from truth for 15min - 9:42hrs (seen in controlled tests) until a clock correction. Some data (~6secs in tests) around the time correction is mistimed, sometimes 11 years in the future, or missing.

Important update to rt2ms program for processing RT130 data

This is to inform you about an important software update needed for processing of Reftek RT130 data in EPIC experiments. We recently discovered an issue with running rt2ms on the second card installed in the RT130.  Sometimes insufficient header values are being written by the RT130 and then rt2ms passes over these packets potentially resulting in a gap on one or more channels (typically less than 1 hour on higher sample rate data, larger gaps on 1sps data).  The EPIC Software Group has patched rt2ms to handle the missing packet headers and write all of the data that are on the card.  We highly recommend that you download and install the updated rt2ms program if you are processing any RT130 data.

Sunday, December 13, 2015
San Francisco - Zelos Hotel

Presentations are now online!  All are PDFs and the PH5 posters are a .gif and a .pdf

Session 1 - SEED Data Archiving

Session 2 - Instrument Responses (given by Mary Templeton of the EarthScope DMC)

Session 3 - PH5 tools and future plans

PH5 poster from AGU 2013

It's been a busy summer for EarthScope/EPIC intern Kasey Aderhold, a PhD Candidate at the Department of Earth & Environment, Boston University. Kasey has been heavily involved in an ongoing comparison of seismic vaults to direct burial installations at two sites: the Dotson Ranch near Socorro, NM, and Poker Flat in Alaska. 

December 2, 2012
San Francisco-Palomar Hotel

An EarthScope EPIC data-archiving workshop will be offered prior to the 2012 Fall AGU meeting in San Francisco. This workshop will serve as an opportunity to help PIs and archivers familiarize themselves with the data group, the support provided by the data group, and the software utilized in the archival process.

Here are frequently asked questions regarding data requests from PH5 data sets archived at the EarthScope DMC.  The answers are based upon the perspective the user is at the Data Request Form, which is available for each PH5 data set via its "Request" link found on the PH5 data set web page of the EarthScope DMC website.

1. How do I select the length of the record?

 EPIC SEG-Y utilizes big endian byte order and sets the various trace headers as outlined below.

EPIC SEG-Y Trace Header

Nanometrics Inc., manufacturer of the Trillium series of broadband sensors, has recently updated the response for Trillium models 120 and 240.

EPIC provides these new response files for Antelope in our FTP download area.

A new posting, "Updated Instrument Response for Trillium_120, Trillium_240 (2 Generations) and Taurus", provides information and links to Antelope response files; it is available here.

If you have questions about using these new response files, please contact pmiller [at] passcal [dot] nmt [dot] edu (Pnina Miller) of the Sensor Group.