Description
E-poster session with display of each e-poster on an assigned touchscreen
We will present the results of testing of a new self-calibrating infrasound sensor design, developed by Hyperion. This design integrates a sound source and system controller logic into the body of a Hyperion infrasound sensor. Both analog and digital versions of this design were constructed and tested. The calibrator produces a sinusoidal pressure signal with amplitude and frequency specified...
To contribute to the identification and mapping of active faults and their geometries in and around Cartago, Costa Rica, scientists from the Costa Rica Volcanological and Seismological Observatory at the National University (OVSICORI-UNA) and from the United States Geological Survey (USGS) have joined efforts to install and operate an urban, dense array of seismic nodes. The network consists...
The International Monitoring System (IMS) network relies on four technologies: seismic, infrasound, hydroacoustic and radionuclide. The draft IMS Operational Manuals for waveform technologies outline the requirements for establishing, maintaining and verifying the performance of IMS stations. Since 2011, the Provisional Technical Secretariat (PTS) has collaborated with the global community to...
Distributed Acoustic Sensing (DAS) is revolutionizing seismology by repurposing existing and purpose-built fibre cables as seismic sensors. While DAS faces challenges, such as higher noise levels and single-component limitations compared to traditional sensors, it offers significant advantages. These include extensive sensing lengths, high sensor density, and fine spatial resolution. Curved...
Currently, the world is undergoing the second quantum revolution. While the first revolution resulted in a wide range of transformative technologies, including nuclear weapons, developments emerging from the second revolution, including a range of promising quantum technologies, seem to be enhancing the monitoring capabilities of the CTBTO. This study explores the potential of quantum sensing,...
With the installation and certification of the International Monitoring System (IMS) station IS42 in 2011, the Azores archipelago became an infrasound sentinel of the North Atlantic Ocean. After more than a decade of detecting global infrasound activity including microbaroms, Atlantic storms, man-made activities, bolides, earthquakes and far-field volcanic eruptions, a second infrasound array...
The seismic wave field is fully described by six components: three components of translation and of rotation (6 degrees of freedom, 6-DoF). As rotational amplitudes are small, for a long time, seismology confined itself to half of the available information by using only translation. However, since roughly two decades, rotational ground motions are observable. Since a couple of years, even...
Broadband seismometry is a foundational instrumentation technology enabling measurements of seismicity for test ban treaty verification. Seismic monitoring networks typically comprise many stations distributed geographically on the Earth’s surface or seafloor. Seismic station data used for test ban treaty monitoring purposes must be trustworthy, meaningful and reliable. The seismic instruments...
Seismometer electrical calibration at IMS stations has long been depended upon to ensure the accuracy of seismometer performance. At best, electrical calibrations provide confidence that the seismometer performance has not changed since the time of installation. However, as an absolute measure, electrical calibrations may not result in a sufficiently accurate or traceable measure of...
In the EMPIR Infra-AUV project, HBK-DPLA extended the frequency range of the reciprocity calibration technique to achieve reliable primary calibrations to frequencies below 40 mHz. It was also demonstrated that secondary calibration based on HBK’s commercially available low frequency calibration system can be made of suitable microphone types down to similar frequencies. After the project,...
Initial calibration can be done in a laboratory using specialized test equipment, but to check calibration of instruments over their lifetime in the field requires different processes. We discuss two particular challenges: site response and temperature sensitivity.
A method for field calibration with respect to a portable reference sensor has been demonstrated by Michaela Schwardt. This...
Calibration activities are one of the minimum requirements for stations of the International Monitoring System (IMS), as specified in the IMS Operational Manuals. The ongoing efforts to maintain and recapitalize the infrasound stations of the IMS network have led to the installation of passive calibration capabilities and well-characterized elements, with a new generation of sensors and Wind...
Ice cover monitoring has been recognized as a critical task in environmental studies for hazard mitigation and critical alerts reporting. Current observation methods of changeable ice thickness often fall short in terms of accuracy, completeness, and cost-efficiency. Distributed acoustic sensing (DAS) uses fiber optic cables as sensitive elements and presents a promising alternative to the...
A seismic network’s primary objective is to provide high-quality data for monitoring earthquakes, analyzing their sources, and studying the structure of the Earth. The good quality of seismic data is obviously important but can only be achieved if many different factors are considered. The quality assessment was verified by using the seismic waveforms from a total of 537 permanent broadband...
The impact of temperature variability in the environment of a seismometer has the potential to affect its operating performance and should be well understood for sensors within the IMS. In this study, GS-13 passive seismometers are collocated with broadband CMG-3T seismometers at two seismic sites near Sandia National Laboratories’ FACT site. The operating temperatures of the seismometers are...
The Comprehensive Nuclear-Test-Ban Treaty Organization (CTBTO) operates five seismic monitoring stations in Indonesia. To ensure the traceability of measurement units for these seismometers, in-situ calibration is essential. This study presents a calibration methodology based on the ISO 17025 standard, employing a comparative method where the seismometer to be calibrated is placed side-by-side...
Infrasound can be detected in nature and human activities, such as earthquakes, volcanic eruptions, mudslides, supersonic flight, etc. The monitoring of infrasound sound pressure signal mainly depends on the infrasound sensor, and the accurate measurement of infrasound sound pressure mainly depends on the calibration of the infrasound sensor.
Since the NPL developed laser-pistonphone to...
A pressure gauge at the seafloor is key sensing instrument for geophysics and oceanography. Pressure change over time can be consent to the seafloor deformation associated with plate convergence in the plate subduction zone or the magma injection near the submarine volcanoes etc. It is also suggested that pressure change at the seafloor can be partly reflected by the ocean current variations,...
Ecuador is a country surrounded by a great variety of natural hazards. Hence, it is necessary to carefully watch seismic and volcanic activity within the country, which requires a great number of resources. The Geophysical Institute of EPN (IG-EPN) oversees monitoring activities in the country, however, budget is usually a problem. With over 300 monitoring sites, IG-EPN must manage the way of...
In this work, a monitoring system has been developed to measure the variations in the magnetic field produced at the Chiles volcano, located in Ecuador on the northern border with Colombia. Additionally, an array composed of twelve one-component sensors arranged in various geometric configurations has been implemented in order to detect seismic and infrasound signals. The system refers to a...
The ocean is key to understanding climate change, sea level rise, tsunamis, and earthquakes. The ocean is difficult and costly to monitor. Over the last decades, dedicated submarine cable systems have been supporting science and early warning, as well as monitoring for nuclear test explosions.
The Science Monitoring And Reliable Telecommunications (SMART) Cables Initiative is working to...
The design details of the Ultra Broad Band (UBB) borehole feedback seismometer are presented including stable Hole-lock camping mechanism. The complete sensor stack weighs less than 20 Kg with a diameter of 89 mm.
The instrument has no mechanical resonances below 400 Hz. We achieved the bandwidth extension to high frequencies with improvements of the mechanical design, i.e. the arrangement...
This poster presents the Algerian Network for Infrasound (ANIs), a pioneering project aimed at establishing a comprehensive network of low-cost infrasound devices across Algeria. In its initial phase, the project involves the deployment of four infrasound sensors in the northern part of the country, with two devices operational since June 2022. Preliminary data from these two operational...
Seismic data from the International Monitoring System (IMS) captures both natural and environmental noise, along with signals from seismic events such as earthquakes or potential explosions. While most of these stations are surface-based, a few instruments are deployed at depths ranging from tens to 100 meters. Although previous studies suggest that deeper instrument deployment may improve...
Emerging small seismometers and infrasound sensors hold transformative potential for strengthening the CTBT verification regime. These portable, relatively inexpensive instruments provide high-resolution data that are essential for the detection and location of events that may indicate nuclear testing. Unlike traditional equipment, they are more affordable and accessible, allowing deployment...
VNIIA is a leading company of Rosatom State Atomic Energy Corporation in CTBT implementation, which currently performs a range of research. Three types of new seismometers of the VNIIA family were designed:
- A seismometer Type 1 – a vertical short-period seismometer for installation in boreholes;
- A seismometer Type 2 – a three component broadband seismometer for installation on a...
The geophysics' field is seeing rapid development of new technologies, including Distributed Acoustic Sensing (DAS). This innovative technique attracts scientists and researchers for its ability to monitor and analyze geological and structural changes with high spatial resolution over large distances. Unlike traditional methods based on the use of stationary instruments, DAS allows to make...
Over the years, Enviroearth has developed Wind Noise Reduction Systems (WNRS) of advanced technologies based on comprehensive CTBTO requirements and configuration range over the whole IMS infrasound station Network.
This work involves the continuous implementation of new manufacturing methods, installation processes and accessories’ technical innovation, making it adaptable to any situation...
