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Geophysical observatory & exploration Systems
Geophysical Observatory & Exploration Systems
Integrated Triaxial Geophone, Rechargeable Battery and Data Logger
9-channel Continuous 250 SPS Recording for Multi-Station MEQ
3-channel Burst Mode 24,000 SPS Recording for Magnetotelluric
Microearthquake Recording (MEQ)
Magnetotelluric (MT) Recording
REF TEK has partnered with the Institute of Earth Science and Engineering (IESE) (a joint venture between the University of Auckland and Auckland UniServices Ltd.) to develop a new multidisciplinary Geophysical Observatory and Exploration System: GOES, Model 160-01. The 160-01 is a single, self-contained, small, field-worthy package that can be handled like a large geophone array. Its system operates in harsh conditions including heat, cold, rain, snow, mud, sand storms, and even while immersed underwater. The 160-01 is sturdy and rugged and can withstand rough handling.
The 160-01 contains a three-component geophone, REF TEK 160 data acquisition unit, rechargeable battery and GPS, all of which are housed in a single waterproof case. The rechargeable battery has a 168 W·H capacity that provides power autonomy with up to 20 days of continuous recording for three seismic channels. The 160-01 presents the user with multiple options, as it contains the internal three-component geophone and six external channels via two external connectors, or can be programmed to disable up to two of the internal geophone components thus providing one internal geophone and eight external channels. A removable USB drive is used to store all of the collected data and upload the system acquisition parameter; thus, no external interface is required to program the system.
Scientists who are interested in both seismic application and geophysical exploration will find that the 160-01 GOES system is the perfect system suitable for their project requirements. As the 160-01 is a multifunctioning system housed in one case, the user will find it much easier to set up for projects related to microearthquake recording (MEQ), magnetotelluric (MT) recording, refraction surveying, and reflection surveying.
The diagram below illustrates deployments using the GOES instruments in different configurations. The first setup shows a seismic reflection/refraction line consisting of nine vertical seismometers (one internal and eight external) connected to each instrument. A group of 40 instruments can record 360 channels of seismic data. By replacing the external vertical geophones with the internal three-component geophone the system is set up for recording microearthquakes (MEQ). By adding electrodes in a dipole configuration the third mode (EM/MT) of data acquisition, e-field recording, is accomplished. An additional instrument with three-component magnetotelluric sensors for every 5th e-field station completes the requirement to record MEQ and MT simultaneously.
A helpful method in these types of studies is "joint geophysical imaging", otherwise known as the JGI method. By using the JGI method, customers reap huge benefits saved time and money" both of which are important factors that financially affect the bottom line of any project.
As seen in the diagram below, without the JGI method, the customer would have drilled at the location site A, only to find a dry well with no permeability, thus wasting time and money drilling unsuccessfully; however, in using the JGI method, the customer saves close to $8 million USD by locating the most productive wells prior to drilling. As seen at site B, this method showed signs of magnetotelluric (MT) and seismic polarization, both indications of a productive well.