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About IIG Observatory Instruments and Facilities

High-Performance Computing Systemt(HPC)

Instrument Details
Make: Fujitsu
Model: 256 Core Computing Cluster integrated with the Intel(R) Xeon based 64-bit processors

The IIG’s high-performance computing (HPC) system is integrated with the Intel(R) Xeon based 64-bit processors.  This system uses Intel MPI over Infiniband interconnect. The system consists of 8 compute nodes, 1 head node, and two storage nodes. The system supports both OpenMP and MPI parallel environments for running the jobs in parallel. The system is connected to the storage with the usable space of ~ 40 TB.
High Performance Computing System
Head Node: Fujitsu RX300 S8 – 1 node
CPU:- 2 numbers Intel XEON processor, 2 x 6 total 12 cores
RAM:- 8 x 8 GB total 64GB
Connectivity:- Infiniband & Ethernet

Compute Nodes: Fujitsu RX500 S7 - Total 8 nodes
CPU:- 4 numbers Intel XEON processor, 4 x 8 total 32 cores /node
RAM:- 16 x 16 GB total 256 GB/node
Connectivity:- Infiniband & Ethernet

Software Specification:-
Operating System:-
RHEL 6.4, Kernel 2.6.32-358.el6.x86_64
Cluster Management Toolkit:- GANANA (Locuz proprietary)
Scheduler:- Univa Grid Engine (uge-8.1)
Compilers:- GNU, Intel Cluster Studio XE 2013 SP1
Libraries:- GNU, Intel Cluster Studio XE 2013 SP1
MPI Libraries:- Intel MPI, OpenMP
MATLAB:- MATLAB is a high-performance language for technical computing. It integrates computation, visualization, and programming in an easy-to-use environment where problems and solutions are expressed in familiar mathematical notation.
Comsol Multiphysics:- COMSOL Multiphysics is a finite element analysis, solver and Simulation software / FEA Software package for various physics and engineering applications, especially coupled phenomena, or multiphysics
IDL:- IDL (Interactive Data Language) is a programming language used for data analysis. IDL is vectorized, numerical, and interactive, and is commonly used for interactive processing of large amounts of data (including image processing).


The codes written in the FORTRAN, MATLAB, and COMSOL that required large computing power can run on this system. The use of the parallel environment of this system in these codes can efficiently reduce the computational time for performing the simulation jobs.

This HPC system can be used for modeling the Earth-Space system processes.
System availability:-
System will be available for the external academic users depending on the availability of the processors time of this HPC system. External users will have to provide the job details, required CPU time and storage space at the time of the request application. Accessing and usage of IIG HPC Cluster is governed by IIG policies and procedures.

About IIG Observatory Instruments and Facilities

Global Navigation Satellite System (GNSS) Receiver
Instrument Details
Make: Trimble; Leica and Serpentrio etc.
Model: Geodetic GNSS Receivers

Reference, Campaign and Kinematic mode observations

Global Navigation Satellite System (GNSS) refers to a constellation of satellites providing signals from space to locate the geographic location of GNSS receivers anywhere in the world. The GNSS includes USA’s Global Positioning System (GPS), Russia’s Global Navigation Satellite System (GLONASS), Europe’s Galileo, China’s BeiDou Navigation Satellite System (BDS) and India’s Indian Regional Navigation Satellite System (IRNSS). The satellite network incorporates microwave signals that are transmitted to GNSS receivers at ground to provide the position, velocity and timing information that enables many applications that we use in our daily lives. These radio waves are electromagnetic energy that travels at the speed of light. The operation of the GNSS system based on a simple mathematical principle called trilateration to locate the receiver through calculations involving information from a number of satellites. Thus measurement of continuous, campaign and kinematic mode observations can provide the position of GNSS receiver at ground very precisely.

  • Precise Positioning, Velocity and Time
  • Measurement of Earth’s Lithospheric deformation
  • Ionospheric Total Electron Content (TEC) observation
  • Atmospheric Water Vapor Content measurement
  • In addition, GNSS data is also used to study Space Weather events and other such specialized applications using above basic observed parameters

About IIG Observatory Instruments and Facilities

(a) Resistivity meter (b) Resistivity Imaging meter

Instrument Details
(a) Make : IGIS
Model : SSR-MP-AT

24V rechargeable battery
Currents up to 200 mA
100 micro volts resolution

(b) Make : IRIS
Model : Syscal Resistivity imager

Voltage 0-1600 Vpp
Current 0-2500 mA
Power250 W
(a) The IGIS signal stacking based signal enhancement resistivity meter model SSR-MP-AT is a state of art microprocessor based data acquisition system.
(b) Multi-conductor electrode cables and computer-driven, automated switching, as well as innovative processing of large resistivity data sets, have allowed simultaneous performance of profiling and sounding to produce two-dimensional “electrical images”

The electrical resistivity method is an active geophysical technique. It employs an artificial source which is introduced into the ground though a pair of electrodes. The procedure involves measurement of potential difference between other two electrodes in the vicinity of current flow. Apparent resistivity is calculated by using the potential difference for the interpretation. These electrodes by which current is introduced into the ground are called Current electrodes and electrodes between which the potential difference is measured are called Potential electrodes.

1) Ground Water Exploration
2) Bed rock Investigation
3) Delineation of Geological Structures
4) Sand and Gravel Deposit Identification
5) Mineral Investigations

About IIG Observatory Instruments and Facilities

Magnetotellurics and Audio-frequency Magnetotellurics

Instrument Details
Make : Phoenix Geophysics, Canada
Model : MTU-5A(P)

Models & channels:Five component (2E electric channels; 3H magnetic channels)
Frequency range: 10 kHz to DC
Dynamic range: 130 dB; gain settings variable by factors of 4
ADC: One per channel, 24 bits
Timing accuracy: Better than ±100 nanoseconds; oven-controlled crystal oscillator synchronized to GPS
Connectors Multi-pin, military-style connectors for sensor input, GPS, and battery Heavy-duty binding posts for electric field inputs and ground
Input power: 12 V DC
Power consumption: Approx. 9—12 W depending on the state of operation, plus approx. sensor load
Environmental Operating: —20°C to +50°C; passive operation causes no environmental damage

The magnetotelluric method is a passive electromagnetic (EM) technique for which natural electric (E) and magnetic (B) fields variations are measured in orthogonal directions on the earth’s surface to determine the resistivity distribution in the subsurface, on depth scales ranging froma few tens of meters to hundreds of kilometres


Data acquisition and sharing is mandated as per adopted IIG’s data policy.

Requirement of magnetotelluric consultancy services can be discussed

About IIG Observatory Instruments and Facilities

Broadband Seismograph

Instrument Details
Make : REFTEK (Trimble)
Model : REFTEK 130S Digitizer with 151B Seismometer

Equipped with high performance tri-axial Broadband Seismometer coupled with the state of the art 24-bit Data Acquisition System. Frequency response of the Seismometer is 120sec – 50Hz with sensitivity of 2000 V/m/s and full scale voltage of ±20V peak-to-peak differential. The digitizer consist of3 independent sigma-delta 24 bit ADC, one for each channel. The input is ±20V with common mode rejection better than 70dB. It is equipped with inbuilt GPS receiver with timing accuracy of more than 10 microseconds.
The seismometer operates on the principle of inertia, that involves sensing the relative motion of the earth’s ground motion through the spring and mass suspended from a frame which moves along with the earth’s ground surface. As the earth moves the relative motion between the mass and the earth generates an electrical voltage that is proportional to the ground motion and is recorded by the Digitizer. The seismometer used is a force balanced velocity transducer with feedback coil, which sends a current such that it opposes any motion of the mass. The analog voltage from the seismometer is digitized by the digitizer.

  • Measures ground motion including the seismic waves generated by an earthquake and other seismic sources along with the ambient noise.
  • Magnitude of an earthquake can be computed.
  • Map the interior of the earth by analyzing the recorded seismograms.

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