Applying Waveform Correlation to Reduce Seismic Analyst Workload Due to Repeating Mining Blasts

2021 ◽  
Author(s):  
Amy Sundermier ◽  
Rigobert Tibi ◽  
Ronald A. Brogan ◽  
Christopher J. Young
Keyword(s):  
Global Network ◽  
Seismic Events ◽  
Selection Threshold ◽  
International Monitoring ◽  
Correlation Processing ◽  
International Data ◽  
Template Selection ◽  
Nuclear Tests ◽  
Threshold Setting ◽  
Test Ban

ABSTRACT Agencies that monitor for underground nuclear tests are interested in techniques that automatically characterize mining blasts to reduce the human analyst effort required to produce high-quality event bulletins. Waveform correlation is effective in finding similar waveforms from repeating seismic events, including mining blasts. We report the results of an experiment to detect and identify mining blasts for two regions, Wyoming (U.S.A.) and Scandinavia, using waveform templates recorded by multiple International Monitoring System stations of the Preparatory Commission for the Comprehensive Nuclear-Test-Ban Treaty Organization (CTBTO PrepCom) for up to 10 yr prior to the time of interest. We discuss approaches for template selection, threshold setting, and event detection that are specialized for characterizing mining blasts using a sparse, global network. We apply the approaches to one week of data for each of the two regions to evaluate the potential for establishing a set of standards for waveform correlation processing of mining blasts that can be generally applied to operational monitoring systems with a sparse network. We compare candidate events detected with our processing methods to the Reviewed Event Bulletin of the International Data Centre to assess potential reduction in analyst workload.

scholarly journals GSETT 3: a test of an experimental international seismic monitoring system

1994 ◽  
Vol 37 (3) ◽  
Author(s):  
F. Ringdal
Keyword(s):  
Monitoring System ◽  
Data Center ◽  
Seismic Monitoring ◽  
Global Network ◽  
Scientific Experts ◽  
International Data ◽  
Comprehensive Test ◽  
International Data Center ◽  
Test Ban ◽  
Operative Measures

The UN Conference on Disarmament's Group of Scientific Experts (GSE) was established in 1976 to consider international co operative measures to detect and identify seismic events. Over the years, the GSE has developed and tested several concepts for an International Seismic Monitoring System (ISMS) for the purpose of assisting in the verification of a potential comprehensive test ban treaty. The GSE is now planning its third global technical test. (GSETT 3) in order to test new and revisled concepts for an ISMS. GSETT 3 wili be an unprecedented global effort to conduct an operationally realistic test of rapid collection, distribution and processing of seismie data. A global network of seismograph stations will provide data to an International Data Center, where the data will be processed an results made available to participants. The full scaIe phase of GSETT 3 is scheduled to begin in January 1995.

Infrasound station IS25 of the International Monitoring System of the Comprehensive Test Ban Treaty : from design to certification

2021 ◽  
Author(s):  
thomas philippe ◽  
sylvain carre
Keyword(s):  
Monitoring System ◽  
International Monitoring System ◽  
Comprehensive Test Ban Treaty ◽  
Monitoring Tools ◽  
International Monitoring ◽  
Deep Forest ◽  
International Data ◽  
Comprehensive Test ◽  
Test Ban ◽  
Test Ban Treaty

<p>CEA is operating the French segment of the International Monitoring System of the Comprehensive Test Ban Treaty (CTBT). Construction of IMS stations was started on the late 90’ and one last station was pending before completing commitment of France.</p><p>Taking into account experience learned over the years, design was thought to combine enhanced detection capability and robustness. It gives also the opportunity to improve out monitoring tools and technics.</p><p>Station run 9 sensors spread out on a deep forest in Guadeloupe; power is distributed with buried cable while data are received with optical fibre to a central facility from which frames are sent to the International Data Center to the CTBTO. Constructiion was carried out in 2019.</p><p>IS25 was certified by the PTS of the CTBTO in November 2020</p>

Teleseismic slowness-azimuth station corrections for the International Monitoring System Seismic Network

1999 ◽  
Vol 89 (4) ◽  
pp. 989-1003 ◽  
Author(s):  
István Bondár ◽  
Robert G. North ◽  
Gregory Beall
Keyword(s):  
Monitoring System ◽  
Global Network ◽  
Systematic Bias ◽  
International Monitoring System ◽  
Time Data ◽  
International Monitoring ◽  
Event Location ◽  
Systematic Biases ◽  
Predicted Values ◽  
Test Ban

Abstract The prototype International Data Center (PIDC) in Arlington, Virginia, has been developing and testing software and procedures for use in the verification of the Comprehensive Test Ban Treaty. After three years of operation with a global network of array and three-component stations, it has been possible to characterize various systematic biases of those stations that are designated in the Treaty as part of the International Monitoring System (IMS). These biases include deviations of azimuth and slowness measurements from predicted values, caused largely by lateral heterogeneity. For events recorded by few stations, azimuth and slowness are used in addition to arrival-time data for location by the PIDC. Corrections to teleseismic azimuth and slowness observations have been empirically determined for most IMS stations providing data to the PIDC. Application of these corrections is shown to improve signal association and event location. At some stations an overall systematic bias can be ascribed to local crustal structure or to unreported instrumental problems. The corrections have been applied in routine operation of the PIDC since February 1998.

CTBT IMS - International Cooperation at its finest

2020 ◽  
Author(s):  
Nurcan Meral OZel ◽  
David Jepsen
Keyword(s):  
International Cooperation ◽  
Global Scale ◽  
Nuclear Test ◽  
Global Network ◽  
Member States ◽  
The Earth ◽  
International Monitoring ◽  
Global Projects ◽  
Test Ban ◽  
Tsunami Warnings

<p>The International Monitoring System (IMS) of the Comprehensive Nuclear-Test-Ban Treaty is one of the most ambitious global projects ever undertaken by more than 183 states. It’s establishment exemplifies international cooperation through the huge undertaking, coordination and massive investment by all Member States. The IMS monitors the whole earth, atmosphere and undersea for any potential nuclear test but this extraordinary network can also detect and record traces of natural and anthrogenic disasters that are ever present.</p><p>The IMS network sets a precedent for reliability, quality and requirements on a global scale. The network is comprised of 4 technologies (seismic, infrasound, hydroacoustic and radionuclide) that monitor the earth’s environments to an incredibly low level and hence is an invaluable resource for monitoring and understanding natural hazards.To date, for example, the CTBTO has signed 14 agreements with tsunami warning organizations for the usage of CTBT data to assist with the timeliness and accuracy of tsunami warnings.</p><p>The effectiveness of plans to deal with natural disasters depends on a country’s level of resources and readiness. Member States can rely and call upon the CTBTO and the IMS network to assist them at a time of crisis. The IMS is truly a global network that has no borders.</p>

Efforts toward automatic aftershock sequences processing at the International Data Centre

2021 ◽  
Author(s):  
Christos Saragiotis
Keyword(s):  
Main Shock ◽  
Tohoku Earthquake ◽  
Seismic Events ◽  
Gorkha Earthquake ◽  
Strong Earthquakes ◽  
Aftershock Sequences ◽  
Order Of Magnitude ◽  
International Data ◽  
Nuclear Tests ◽  
Illapel Earthquake

<div> <p>The number of aftershocks after a large main shock may increase the daily number of seismic events by an order of magnitude for a few days or even weeks. The large number of incoming arrivals reduces the effectiveness of automatic bulletin generation and significantly increases the work of the analysts. In the verification context such aftershocks may delay the production of the CTBTO Reviewed Event Bulletin, as well as mask clandestine nuclear tests. Consequently, the CTBTO has been investigating ways to improve the performance of the automatic processing during aftershock sequences.  </p> </div><div> <p>In line with this investigation, the PTS launched a project with the objective to evaluate three algorithms that could address this issue, namely the Empirical Matched Field developed at NORSAR, the SeisCorr developed at Sandia National Labs and XSEL developed at the IDC. In this abstract we present comparisons on the performance of the three methods on the aftershock sequences of four very strong earthquakes: the Tohoku earthquake in Japan (March 2011), the Gorkha earthquake in Nepal (April 2015), the  Illapel earthquake off the coast of Chile (September 2015) and the devastating earthquake in Papua New Guinea (February 2018).</p> </div>

Finite-frequency effects for imaging underground cavities

2021 ◽  
Author(s):  
Felix M. Schneider ◽  
Petr Kolínský ◽  
Götz Bokelmann
Keyword(s):  
Analytical Approach ◽  
Nuclear Test ◽  
Underground Cavity ◽  
Finite Frequency ◽  
Cavity Detection ◽  
Frequency Effects ◽  
The Past ◽  
Nuclear Tests ◽  
Seismic Anomalies ◽  
Test Ban

<p>We study finite-frequency effects that arise in cavity detection. The task comes along with the Onsite-Inspection part for the Comprehensive Nuclear Test Ban Treaty (CTBT), where the remnants of a potential nuclear test need to be identified. In such nuclear tests, there is preexisting knowledge about the depths at which nuclear tests may take place, and also about sizes that such cavities can attain. The task of cavity detection has consistently been a difficult one in the past, which is surprising, since a cavity represents one of the strongest seismic anomalies one can ever have in the subsurface. A conclusion of this study is that considering finite-frequency effects are rather promising for cavity detection, and that it is worthwhile to take them into account. We utilize an analytical approach for the forward problem of the a seismic wave interacting with a underground cavity in order to develop an inversion routine that finds and detects an underground cavity utilizing the transmitted wave-field.</p><p> </p>

scholarly journals Adjoint backtracking for the verification of the Comprehensive Test Ban Treaty

2002 ◽  
Vol 2 (6) ◽  
pp. 2133-2150 ◽  
Author(s):  
J.-P. Issartel ◽  
J. Baverel
Keyword(s):  
Adjoint Operator ◽  
Real Data ◽  
Daily Basis ◽  
New Approach ◽  
Comprehensive Test Ban Treaty ◽  
Tracer Dispersion ◽  
International Monitoring ◽  
Comprehensive Test ◽  
Test Ban ◽  
Test Ban Treaty

Abstract. An international monitoring system is being built as a verification tool for the Comprehensive Test Ban Treaty. Forty stations will measure on a worldwide daily basis the concentration of radioactive noble gases. The paper introduces, by handling preliminary real data, a new approach of backtracking for the identification of sources after positive measurements. When several measurements are available the ambiguity about possible sources is reduced significantly. As an interesting side result it is shown that diffusion in the passive tracer dispersion equation is necessarily a self-adjoint operator.

Particular generalisation: the Antarctic Treaty of 1959 in relation to the anti-nuclear movement

Polar Record ◽  
2008 ◽  
Vol 44 (2) ◽  
pp. 115-125 ◽  
Author(s):  
Jason Kendall Moore
Keyword(s):  
The United States ◽  
Strategic Orientation ◽  
Nuclear Movement ◽  
The Us ◽  
Antarctic Treaty ◽  
Nuclear Tests ◽  
The Right ◽  
The Cold War ◽  
Test Ban ◽  
The Antarctic

ABSTRACTThis article presents the US role in the formation of the Antarctic Treaty of 1959 in relation to the era's anti-nuclear movement. The purpose is two-fold: to highlight the strategic orientation of US Antarctic policy, suggesting that it was less enlightened than it is frequently portrayed; and to highlight the influence of the anti-nuclear movement upon the treaty's inclusion of a test ban which the United States initially opposed, hoping to reserve the right to conduct nuclear tests. The treaty is depicted as a particular generalisation: one aspect of the cold war that gains significance when scrutinised in relation to another that is much better-known.

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