Visit Geobit at AGU Annual Meeting 2023

Visit Geobit at AGU Annual Meeting 2023

Geobit & ISTI join together at the AGU Annual Meeting in San Francisco, 11 – 15 Dec 2023.

We are glad to announce that we are exhibiting at the AGU Annual Meeting 2023.

With 65+ years of combined experience, GEObit and ISTI are joining forces to become the most competitive and fastest growing joint venture group in the seismic monitoring services industry.

Providing state-of-the-art seismic instruments, network design, installation techniques, data monitoring and processing services, our group is able to deliver a cost-effective total solution to the energy exploration & production industry, especially to the oil, gas and geothermal sector. Our key benefits are that we produce in-house hardware and software while installing and maintaining the microseismic monitoring network to ensure a high level of data quality and availability. In other words, we make the technology – we apply the technology – we offer the technology.

We have worldwide experience having installed and operated seismic networks all over the world, from Indonesia/Papua jungle to the Middle East desert, from Alaska glaciers to Himalayan Mountains. In the USA, we are currently running many dedicated microseismic monitoring projects with over 200 stations installed in the past 10 years.

Visit us at booth #1023, AGU 2023

 

San Francisco, CA, USA  |  11 – 15 December

 

Meet our team and learn about the latest offerings. Nikos Germenis & Vaso Kranou (Geobit), Paul Friberg & Sid Hellman (ISTI), and others will be available to answer your questions.

Moscone Center

747 Howard Street, San Francisco, CA 94103

More information about AGU Annual Meeting 2023 may be found here.

Geobit’s poster presentation schedule

Abstract ID: 1257461
H41S-2005: A new broad-band compact digital seismometer for seismicity monitoring and passive seismic acquisition
Presentation Type:  In-Person Poster Session
Session Number and Title: H41S: The MacGyver Session: Novel, Exciting, Self-Made, Hacked, and/or Improvised Sensors, Data Acquisition, and Data Transmission Solutions to Understand the Geosphere Poster
Session Date and Time: Thursday, December 14th; 8:30 AM – 12:50 PM PST
Location: MC, Poster Hall A-C – South

Visit us at AOGS2023

Visit us at AOGS2023

Asia Oceania Geosciences Society (AOGS) 20th Annual Meeting

We are pleased to announce that Geobit is exhibiting at the 20th Annual Meeting of Asia Oceania Geosciences Society (AOGS). We welcome you to visit our booth, to meet our team and learn about our new upcoming instruments and technologies. We will also be available to answer your questions.

The annual meeting will be taking place in SUNTEC Singapore from 30 July to 04 August 2023.

Opening Times:

Monday, 31st July 2023
6:30pm to 8:30pm

Tuesday, 1st August 2023
9am – 5pm

Wednesday, 2nd August 2023
9am – 5pm

Thursday, 3rd August 2023
9am – 5pm

We hope to see you there!

When: 30 July - 4 August 2023

Where: SUNTEC Singapore, 1 Raffles Blvd, Singapore 039593

Asia Oceania Geosciences Society (AOGS) was established in 2003 to promote geosciences and its application for the benefit of humanity, specifically in Asia and Oceania and with an overarching approach to global issues. Asia Oceania region is particularly vulnerable to natural hazards, accounting for almost 80% human lives lost globally. AOGS is deeply involved in addressing hazard related issues through improving our understanding of the genesis of hazards through scientific, social and technical approaches. AOGS holds annual conventions providing a unique opportunity of exchanging scientific knowledge and discussion to address important geo-scientific issues among academia, research institution and public. Recognizing the need of global collaboration, AOGS has developed good co-operation with other international geo-science societies and unions such as the European Geosciences Union (EGU), American Geophysical Union (AGU), International Union of Geodesy and Geophysics (IUGG), Japan Geo-science Union (JpGU), and Science Council of Asia (SCA).

Geobit to discuss with future resellers and distributors

After years of cooperation with advanced geophysical companies in limited areas of Asia, we are now open to discuss the expansion of our network.

If you are interested in becoming a Geobit reseller or Distributor, we are welcome you in our booth #D11 to discuss details and opportunities.

Geobit oral presentation

  • Abstract: SE17-A006 A New Broad-band Seismometer for Seismicity Monitoring and Passive Seismic Acquisition: Design, Modeling and Evaluation
  • Presentation Mode: Oral
  • Session Date/Time: D2-AM1: 8:15 AM – 10:00 AM, Tue, 01 Aug 2023
  • Presentation Length: 15 minutes
  • Author: Nikos Germenis
Earthquake Early Warning System – Case study in Indonesia

Earthquake Early Warning System – Case study in Indonesia

Earthquake Early Warning System

Case studies

Geobit, April 2023

1. Introduction

Early warning systems are used to alert users a few seconds before a strong earthquake hits the protected area. The system is able to detect the primary p-waves of an earthquake and produce am alarm prior s-waves arrival. The system can be used to switch off critical facilities or machines and alert people for upcoming earthquakes.

2. Principles of Operation

Typically, acceleration sensors are installed in the surrounding area of the protected infrastructure. Several sensors are required for making sure that the system will be not noise sensitive. The sensor is transmitting data in real time to a server which runs special acquisition & analysis software. The software using quick earthquake detection mechanisms, mainly based on the quick detect of the p-wave arrival of an earthquake, is able to generate an alarm and activate a switch relay in case of an earthquake.

3. Installation

Low-cost hardware is used for this application, like the GEOBIT GEOwarning low cost accelerograph. The accelerographs operate in trigger mode so they are able to generate a trigger in case of earthquake. The trigger information is transmitted to the GEOedge software, that decided if the triggers are related with an earthquake or not. If yes, the GEOegde informs the user via email-sms an instantly generates a switch relay (or more if required) which is connected to the acquisition computer.

Picture 1

The GEOthree data-logger

Picture 2

GEOwarning, Early warning accelerograph

Picture 4

Seismic stations consist of GEOwarning accelerographs

Picture 5

Seismic stations consist of GEOwarning accelerographs

4. Software

The trigger information is transmitted to the GEOedge software, that decided if the triggers are related with an earthquake or not. If yes, the GEOegde informs the user via email-sms an instantly generates a switch relay (or more if required) which is connected to the acquisition computer.

Picture 5

Acquisition computer

Picture 6

GEOedge main menu

Picture 7

GEOedge running

Picture 8

GEOedge waveform plot

Picture 9

GEOedge stations map

 5. References

The system has been installed by our Indonesian partners and resellers “PT. EXACT GLOBAL TEKNOLOGI”.

[1]: https://geobit-instruments.com/accelerometers-strong-motion-sensors/

[2]: https://www.exactglobal.co.id/

Portable Seismic Stations

Portable Seismic Stations

Portable Seismic Stations

GEObit provides compact solutions for quick deploy seismic stations based on GEOThree digitizer/recorder and C100 sensor. The GEOThree recorder has 3 input channels, and integrated sensor electronics. The digitizer is based on a powerful, wide dynamic range 32bit delta-sigma analog-to-digital converter, with very low noise characteristics and excellent power supply rejection. The sampling rate can be set to 50, 100, 200, 250, 500 and 1000 samples per second. The sensor response is 10sec – 98Hz. The data are stored into removable microSD card. Ultra low power consumption allows over one month of operation if getting powered from an ordinary 12V/65Ah lead-acid battery.

The LCD, displays the State-of-Health, time and date and other information related to the instrument’s operation. The digitizer is intended for installation in harsh environments. The instrument supports embedded SEEDlink server for real time data telemetry.

Applications

  • Aftershock studies
  • Local and regional seismicity monitoring
  • Seismic Tomography
  • Reservoir monitoring
  • Induced seismicity monitoring
  •  Geothermal monitoring
  • Structural monitoring (Dams, Bridges, Ancient Castles)

Here we present the instrumentation which have been used in several passive tomography projects as well as several micro-seismicity and induced seismicity projects, and explain why we propose the use of this kind of equipment.

Micro-Seismicity Monitoring Instrumentation GEOThree Compact Sensor/Digitizer/Recorder Unit

Figure 1: seismic Event

So why chose a GEObit unit? 

1. Why wide band sensor?

At micro-seismicity monitoring experiments and applications the seismic events usually have a magnitude from –2R, up to 4R, and their frequency spectrum is into the band 0.8Hz to 20Hz. So, a wide band seismometer with the range of at least 0.5Hz(2 sec) up to 30 Hz is necessary to be used for the recording of such seismic events. In micro-seismicity monitoring , we are using sensors with recording bandwidth from 0.1Hz to 100Hz in order to record the seismic events with the maximum quality. The low frequency response gives us the ability to calculate moment tensors as well.

Figure 2: seismic Event plot

Figure 3: seismic event spectrum plot

Somebody may ask, why not broadband sensors? The answer is that the broadband sensors are much more expensive than our sensors and makes the survey inefficient in price terms. We do not get more information using broad-band sensors of local micro-earthquakes recording. At the next experiment we used wide band and broad-band sensors at the seismic network. Here is an example of a recorded earthquake.

Figure 4: seismic event recorded from wide-band and broad band sensors

Figure 5: seismic event spectrum of the broad-band sensor

Figure 6: seismic event spectrum of the wide-band sensor

The figure 4 shows a typical seismic event recorded from a wide-band and eight broad-band (Nanometrics – Trillium 40T) sensors. Trace 19 is the broad-band one and it could not be recognized from others having a first look at the signal plot. The frequency spectrum of the BB sensor and the spectrum of the wide-band sensors are presented at figures 5 and 6 respectively. These spectrum plots represent frequencies of the recorded signals of the same earthquake. Clearly, both are equal, therefore enev with the use of wide-band sensor, the recording result is equal.

Why not using simple geophones? Commercial geophones with small dimensions have usually natural frequency 4.5Hz or 10Hz. Using these kind of geophones, the lower part of the spectrum of the signal is lost (low frequency), because the geophones cannot respond in the low frequency area (below 4.5 Hz), and its sensitivity falls dramatically. There are also geophones in the market with natural frequency of 2.0Hz or 2.5Hz, but their dimensions do not allow to be used in small boreholes. Their bandwidth is quite enough for magnitude 1 or 2 local events, but not enough to cover low frequency, below 1Hz.

2. Why force-balance sensor?

The S-100 sensor is based on force-balance principle. Special electronics provide feedback at 4.5Hz geophones, plus additional electronic bandwidth correction and provide a 10sec-98Hz sensor unit. The 4.5Hz geophones are not so sensiitive over tilt. Usually they respond perfectly within 5 – 10 degrees of tilt. This means that the sensor can be installed into the borehole without any need of special leveling. An elastic packer provided from us, is more than enough to hold the sensor into the borehole. It is leveled according the casing verticality and it is operational, ranging within its characteristics even there is some degrees of tilt at the borehole casing. So, the ideal solution for fast, accurate installation is the wide-band seismometers consisted of 4.5Hz geophones, having small dimensions and low cost, designed according the force-balance principle. Our wide-band sensors meet all the requirements for local micro-earthquake recording in the passive tomography projects and in our new GEOThree digitizer/recorder, the sensor electronics are build-in into the instrument.

3. Why borehole type sensor?

Many seismic sensors are surface mount type. For their installation, usually seismic vaults have to be opened, where the noise level is less than the surface. Our instruments are mostly borehole type, so they can be easily installed in a typical depth 20 meters. The noise level at this depth is much less than the surface. The borehole can easily be (in the most of the cases) opened using a drilling machine at low cost, within some working hours. Small diameter boreholes can be opened by hand in rough areas where no vehicles can access.

Figure 7: seismic noise at 20m depth borehole

Figure 8: seismic noise at the surface

Figure 9: Sinusoidial signal for sensor calibration

Figure 10: Pulse signal for sensor calibration

4. Why high sensitivity sensor?

 The magnitude (Richter Scale) of the recorded events for the passive seismic tomography exploration, range from –2R to 3R. For the recording of such small events, the sensor must be very sensitive. Our instruments provide high sensitivity such as 1500V/m/sec.

5. Why in-build sensor self test?

 The operator needs a way to apply a fast signal test to the equipment in order to verify proper operation. Most of the clients are asking for such kind of tests to be performed from the instruments by themselves. The GEOThree recorder provides a build-in signal generator combined with a micro-controller, and injects signal to the sensor. The square wave or sinusoidal signal that injected to the sensor with constant amplitude, forces the masses of the geophones to move. The geophones produce a seismic signal to their output proportional to their movement. The shape of this signal that the user should see is shown at the figures 9 and 10.

Once the user connects  with the GEOThree unit through the DataMonitor, he can verify the proper operation of the sensor. In parallel, the processor of the digitizer uses this signal to perform auto-calibration function at the system. So, all the seismic stations of the microseismic network can always be calibrated during the recording period.

6. Why high resolution digitiser?

 The resolution of the digitiser is one of the most important parameters of the seismic instrumentation. 24bits digitizers are mostly used in seismic exploration. The GEOThree unit is based on a 4rd generation 32bit digitizer, with dynamic range 136dB at 250sps, while dynamic range is 142dB at 10sps.

7. Why big capacity storage media?

Our standalone seismic stations units are getting powered from a typical 12V battery which may be cycler from seismic crew or charged by a solar panel. The seismic crew usually visits the stations once per month or later for changing battery and retrieving the data. For places that this routine visit is difficult to be done, because that the access of some stations is difficult, the storage media must have enough capacity to store the data for longer period. Using a 2Gb microSD the recording duration for 3ch, 100sps will be up to 26days. Larger capacity Compact Flash Card will be used for larger recording period. The units support up to 64Gbytes flash card.

Figure 11: Digitizer noise spectrum

Figure 12: Digitizer noise histogram plot

Figure 13: Portable seismic station 

8. Why very low power consumption?

 One other important point of the standalone seismic station is the power autonomy. Given that is it powered from a simple 12V lead acid battery, the cycle must be as many days as the seismic crew needs to visit the seismic station. Seismic networks consisted of 50 seismic stations, spread in an area of 1000 – 2000 Sqm2 placed in accessible terrain, usually takes a few weeks to the seismic crew for visiting them. So the power autonomy of each seismic station (recorder + sensor) must be enough for at least one month of operation. Our seismic stations can operate for this time period, powered from a set of double 12V/62Ah lead –acid batteriy.

AGU Fall Meeting 2022: We are back

AGU Fall Meeting 2022: We are back

Geobit & ISTI join together at the AGU Fall Meeting in Chicago, IL, 12 – 16 Dec 2022.

We are glad to announce that we are exhibiting live again at the AGU Fall Meeting, after an absence of two years, because of Covid19 restrictions.

With 65+ years of combined experience, GEObit and ISTI are joining forces to become the most competitive and fastest growing joint venture group in the seismic monitoring services industry.

Providing state-of-the-art seismic instruments, network design, installation techniques, data monitoring and processing services, our group is able to deliver a cost-effective total solution to the energy exploration & production industry, especially to the oil, gas and geothermal sector. Our key benefits are that we produce in-house hardware and software while installing and maintaining the microseismic monitoring network to ensure a high level of data quality and availability. In other words, we make the technology – we apply the technology – we offer the technology.

We have worldwide experience having installed and operated seismic networks all over the world, from Indonesia/Papua jungle to the Middle East desert, from Alaska glaciers to Himalayan Mountains. In the USA, we are currently running many dedicated microseismic monitoring projects with over 200 stations installed in the past 10 years.

Visit us at booth #1726, AGU 2022

 

Chicago, IL, USA  |  12 – 16 December

 

Meet our team and learn about the latest offerings. Dimitris Mourtzouchos & Effie Siaini (Geobit), Paul Friberg & Sid Hellman (ISTI), and others will be available to answer your questions.

McCormick Place - South Building

2301 S King Dr, Chicago, IL 60616

More information about AGU Fall Meeting 2019 may be found here.