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Here are some of the articles that have been recently posted to the PASSCAL website:

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: 

12/04/2023
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Important Hardware/Software Notes for Researchers Using EPIC Equipment

This page includes important Hardware/Software Notes for Researchers Using EPIC Equipment. January 17, 2019: GPS Rollover

Late 2018 EPIC learned of a GPS week rollover event that can affect data logger performance and timing. EPIC has acquired a GNSS signal generator that can emulate GPS satellite signals. This satellite emulator allows us to test EPIC equipment that relies on GPS timing and to determine how equipment will handle the GPS rollover event. To date, we have determined that some models of GPS engines are affected by the rollover. How the rollover errors manifest is dependent on the data logger’s model and firmware version of the GPS engine.

01/17/2019
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Instrumentation

Instrumentation to support portable seismology available from the EPIC:

Dataloggers - This section encompasses the equipment which take in data and stores it on some type of non-volatile media.

Power Systems - All the required equipment to keep a seismic station continuously powered throughout its deployment.

Sensors - The equipment that actually detects and quantifies ground motion. The sensor sends this information to the datalogger through a cable.

10/29/2025
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Documentation - How to Archive your Active Source Data

Refer to the documentations below to learn how to prepare the data you've collected for archiving.  EPIC supports PH5 and SEGY as the archival data formats of active-source data sets.

Data from PH5 format data sets archived at the DMC can be accessed via PH5 Web Services.

09/25/2025
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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.

08/22/2025
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Data Archiving Information

Data Archiving Information Center All experiments

   Data Delivery Policy

08/21/2025
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What is Needed to Archive your Active Source Data Set?

 

08/21/2025
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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:

08/21/2025
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Contacts

E-mail

Main EPIC mailing list: epic [dot] passcal [at] earthscope [dot] org

PI-Support and Logistics: epic [dot] logistics [at] earthscope [dot] org

07/01/2025
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Infrasound Sensors

EPIC Infrasound Sensors: Chaparral Physics 64Vx2 Features:
06/25/2025
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