International Data Centre Page 1 Performance of waveform cross correlation using a global and regular grid of master events Bobrov, D., I. Kitov, and M. Rozhkov International Data Centre Preparatory Commission for the Comprehensive Nuclear-Test-Ban Treaty Organization Provisional Technical Secretariat Vienna International Centre P.O. Box 1200 A-1400 Vienna AUSTRIA [email protected]
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Performance of waveform cross correlation using a global and regular grid of master events
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International Data Centre Page 1
Performance of waveform cross correlation
using a global and regular grid of master events
Bobrov, D., I. Kitov, and M. Rozhkov
International Data Centre Preparatory Commission for the Comprehensive Nuclear-Test-Ban Treaty Organization Provisional Technical Secretariat Vienna International Centre P.O. Box 1200 A-1400 Vienna AUSTRIA [email protected]
International Data Centre Page 2
Objectives
Building a global grid of master events for waveform cross
correlation.
Assessing the performance of waveform cross correlation as a
technique of seismic monitoring using the global grid of
master events.
International Data Centre Page 3
Outline
1. Motivation
2. Global seismic monitoring: IMS
3. Global seismicity: IDC view
4. Global cross correlation grid: a design
5. Cross correlation at teleseismic distances
6. Underground nuclear explosions as master events
7. Synthetic master events
8. Principal and Independent Component Analysis
9. Testing with world seismicity of February 12, 2013
10. DPRK 2013 of February 12, 2013
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Cross correlation as an IDC technique
Motivation
• Regional studies demonstrate significant improvement in detection,
location, and magnitude estimation.
At least an order of magnitude!
• Many IMS primary stations are arrays enhancing the capability of
cross correlation analysis.
• For arrays, correlation distance depends on phase and its slowness.
• At teleseismic distances, high level of cross correlation is observed
for signals from events spaced by 100 km and even more.
• Remote events may have similar signals.
• Small events can be considered as point sources emitting signals
identical in shape when co-located.
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IMS, seismic network
Blue circles – primary arrays, blue triangles – primary 3-C stations.