Archiving Data

SmartSolo archives flipped polarity (IGU-16HR 3C 5Hz)

Dear EarthScope Community and EPIC PIs:

In September of 2023 we discovered that SmartSolo node (IGU-16HR 3C, 5Hz) data archived from EPIC experiments has a non-standard polarity on the Z-channel relative to the down-positive industry geophone convention. Details of this discovery and the steps that will be taken to correct this discrepancy, which will affect the existing and future archives, are outlined below.

Issue

The expected polarity for data archived from EPIC experiments are as follow:

Broadband seismometer – Up (Z-dip = -90), North and East motion produce a positive polarity. Geophone – Down (Z-dip = +90), North and East motion produce a positive polarity

Data archived, both PH5 and SEED, prior to October 05, 2023 from EPIC experiments using the SmartSolo nodes have the following polarity and metadata mismatch: 

Important Update to rt2ms

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.

EPIC pre-AGU Workshop

EPIC Workshop: Data Archiving and More!

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

EPIC SEG-Y Trace Header

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

 

EPIC SEG-Y Trace Header

 

Passive Source (SEED) Archiving Documentation

Main Documentation for PASSIVE Source Data Processing (SEED)

The documentation below offers instructions for archiving data from EPIC instrumentation in miniSEED format with metadata to be submitted as stationXML. To archive data from a EPIC experiment, select the appropriate documentation for your instrument for instructions for preparing the data before transferring it to EPIC. For the metadata, EPIC offers software for generating stationXML for your experiment. Please see the documentation for metadata generation using Nexus.

For EPIC PIs who previously archived data using Antelope, our documentation has been reworked to generate metadata in stationXML format via the EPIC program Nexus rather than using an Antelope database to create a dataless SEED. The documentation for archiving data with Antelope is still available on this page.

Related categories:

Requirements for EPIC Passive Experiments (SEED)

  Data and format for archiving

In order to accept your passive-source data for archiving please comply with the procedures and standards below. EPIC staff are available to assist you with meeting the requirements of archiving your SEED data as stated in the EPIC Data Delivery Policy

Regarding the archiving of SEED data, the policy may be summarized in three points:

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