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Seismic Stations Calibration

#1067


Cteation of a Technology Using Powerful Seismic Vibrators to Calibrate Seismic Stations and Seismic Traces

Tech Area / Field

  • ENV-SEM/Seismic Monitoring/Environment

Status
8 Project completed

Registration date
08.08.1997

Completion date
30.05.2002

Senior Project Manager
Horowicz L

Leading Institute
Institute of Computational Mathematics and Mathematical Geophysics, Russia, Novosibirsk reg., Novosibirsk

Supporting institutes

  • Experimental Vibroseismic Expedition of Siberian Branch of RAS, Russia, Novosibirsk reg., Novosibirsk\nNIIIT (Pulse Techniques), Russia, Moscow

Collaborators

  • Lawrence Livermore National Laboratory, USA, CA, Livermore\nPreparatory Commission Comprehensive Nuclear-Test-Ban Treaty Organization, Austria, Vienna\nLos-Alamos National Laboratory, USA, NM, Los-Alamos\nMusée Royal de l'Afrique Central, Belgium, Tervuren

Project summary

Efficiency of Systems for monitoring of nuclear tests within the Comprehensive Test Ban Treaty (CTBT) essentially depends on accuracy in the determination of time, geographical coordinates, depth and power of explosions in accordance with the data for seismic waves recorded by seismologic stations. The purpose of the present project is to develop a technology of calibration of seismic arrays and seismic stations of the International Seismic Monitoring System (ISMS) using powerful vibrators. This will make it possible to increase accuracy in the determination of the coordinates of explosions.

Errors in the determination of the parameters of a seismic source by a network of ISMS stations are due to horizontal and vertical inhomogeneity of the Earth's crust and upper mantle. This inhomogeneity causes large variations in the parameters of seismic waves, which are recorded at various azimuths and distances from a source. Deviations of wave arrival times and amplitudes recorded by a seismic array from standard hodographs and calibration curves averaged over azimuths cause calculation errors of the source parameters.

Powerfill 100-ton seismic vibrators,' seismic waves from which are recorded at distances of 1000 km, have been developed in the Siberian Branch of RAS. It is proposed to carry out investigations to compare explosive (explosions in quarries) and vibrational seismograms and study the possibility of using powerful vibrators for calibration of the ISMS network of stations.

At the first stage of experimental works, quarries with regularly set off industrial explosion, seismic waves from which are recorded at the Bistrovka vibroseismic test site (Novosibirsk region), will be chosen.

At the second stage, it is proposed to perform observations of the vibroseismic field from powerful vibrators in the chosen quarries at distances not exceeding 500 km. They are determined by the capabilities of the vibrators mounted at the Bistrovka test site.

In the process of project realization, numerical simulation will be made to study seismic waves caused by short-delayed explosions in quarries, in particular, to compare wave fields under explosive and vibration excitation.

The peculiarities of propagation of seismic waves near the Earth's surface and the influence of reflected waves on the accuracy in the determination of the angle of an arriving wave recorded by a borehole seismometer will be investigated theoretically and experimentally. A method for determination of the corresponding corrections will be developed.

Processing of obtained materials will make it possible to identify the main features of explosive and vibration seismograms, estimate the power of vibrators, which is necessary for calibration of seismic stations at distances of up to 2000 km, and develop a method for calibration taking into account regional inhomogeneity.

Potential Role of Foreign Collaborators

Participation in experiments with powerful vibrators for the problems of calibration of seismic stations and seismic traces, data analysis and discussion of the results.


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