Multi Channel

Education and Public Outreach at EPIC - French School Visit

On Friday, November 1st 2013, a group of students and teachers from Bethesda, Maryland's Lycée Rochambeau/ French International School visited the EarthScope/EPIC facility on Socorro NM for some hands-on demonstrations of how seismic measurements are used to "see" geological strata underground.  The class, led by instructor Marc Roux, head of the Biology and Geology Department, were assisted by EPIC scientists Greg Chavez and Michael Johnson during the deployment of a long string of geophones and a multi-channel data acquisition system.  The students then used heavy hammers to produce active source tremors, and then were able to see the seismic responses in real time.  The class assembled in the EPIC conference room to hear EPIC scientists/data specialists Dr. Wallis Hutton and KatyLiz Anderson discuss how such measurements can be used to find the depth of subsurface structures like the Moho.  The visit was capped with a tour of the EPIC facility, led by scientist/software engineer Dave Thomas. (Photo: student Salomé Carcy; credit: Dr. Wallis Hutton)

Related categories:

Controlled Sources

The Propelled Energy Generator, model: PEG-40Kg

Currently, the only controlled active source available from EPIC is the PEG 40Kg Propelled Energy Generator, manufactured by R.T. Clark Companies, Inc. EPIC has purchased its first fully automated PEG-40Kg system in 2011. The system is light weight, and highly portable, and is designed to easily mount onto a truck or SUV hitch. Seismic energy is produced when  a large hammer mass weight is propelled by an elastomer band (i.e. a very large rubber band) onto an impact plate, producing an impact frequency range of 10-250Hz. The source is controlled with a hand held motor controller,  and can operate in single cycle or continuous cycle mode. The device is powered by a 12V large capacity battery (car battery).  The PEG-40Kg was received, assembled, and field-tested by  EPIC staff on June 23rd-28th, 2011.

Dataloggers

A datalogger (also know as data acquisition system or DAS) is piece of electronic equipment which converts an input into a digital time series representation. Immense care should be taken when setting up and programming a datalogger. It is highly recommended that only experienced users program their own dataloggers and all others should consult a EPIC staff member for assistance.

While specific procedures and programming details will vary between the various types of dataloggers, there are several things that hold true when working with any datalogger.

The datalogger should be:

Geode Datalogger

GEODE 24-CHANNEL IN-FIELD SEISMOGRAPH.

System consists of one 24-channel Geodes, with two built-in high-speed connections to interface with other Geodes and a PC-compatible controller or the StrataVisor NZ seismograph.

Suitable for reflection, refraction, downhole, crosshole, surface wave, and tomography surveys, and seismic monitoring.

Multi-Channel Dataloggers

EPIC has been upgrading its pool of Multi-Channel Dataloggers in recent years to include multiple ES-3000 Geodes and a 60 Channel Strata View NZXP. These upgrades are also compatible with all of EPIC's Multi-Channel Cable System, which were originally purchased for use with the Geometrics StrataVisor NX. These  Units employ a new concept in portable exploration seismographs. They combine the ruggedness and high signal quality of a distributed system with the convenience and cost effectiveness of personal computer-based control devices. See Geode and Stratavisor Dataloggers for more Details.

 

Cables for Multi-Channel Dataloggers

  Channel Type Number of Takeouts Takeout Spacing Total Cable Length Inter Connectable Geode 24ch Single/3-Component 24
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