In Situ Monitoring of Local Seismicity
An essential element of CTBT IMS monitoring is accurate epicenter locations. Recently, focus is on the IASPEI 1991 travel time tables which are not adequate for global usages due to strong upper mantle velocity variations in many regions. Related problems are network configurations (too few reportin...
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ftdtic:ADA530006 2023-05-15T16:12:19+02:00 In Situ Monitoring of Local Seismicity Husebye, Eystein S. Fedorenko, Yuri V. BERGEN UNIV (NORWAY) INST OF SOLID EARTH PHYSICS 2000-09 text/html http://www.dtic.mil/docs/citations/ADA530006 http://oai.dtic.mil/oai/oai?&verb=getRecord&metadataPrefix=html&identifier=ADA530006 en eng http://www.dtic.mil/docs/citations/ADA530006 Approved for public release; distribution is unlimited. DTIC Seismology Seismic Detection and Detectors *PRIMARY WAVES(SEISMIC WAVES) NORTHERN EUROPE ARRAYS SEISMIC DETECTION MINING ENGINEERING SEISMIC DATA WAVE PROPAGATION CONFIGURATIONS EARTH CRUST SEISMIC WAVES EPICENTERS NORWAY AREA COVERAGE EARTH MANTLE SEISMOLOGICAL STATIONS SECONDARY WAVES PHASE VELOCITY SYMPOSIA MONITORING FOREIGN REPORTS SEISMICITY IMS(INTERNATION MONITORING SYSTEM) Text 2000 ftdtic 2016-02-23T03:47:24Z An essential element of CTBT IMS monitoring is accurate epicenter locations. Recently, focus is on the IASPEI 1991 travel time tables which are not adequate for global usages due to strong upper mantle velocity variations in many regions. Related problems are network configurations (too few reporting stations) and persistent identification and pickings of secondary phases. For small array records, phase velocities can be estimated via f-k analysis but still differentiations between Pg-, PmP- and Pn-phases and likewise Sn- and Lg-phases remain problematic. In the latter case the issue is whether ray theory is adequate for describing wave propagation in the crustal wave guide. We are considering two approaches to the above problems; namely (i) to analyze existing monitoring performance using NORSAR GBF-bulletin data including use of close-in station records from the Khibiny and (ii) event discrimination in W. Norway. The GFB data cover 1999 and the total no of events were 7793 mainly stemming from Kiruna, Sweden (3544), Khibiny, Kola (956) and Zapolarny, Kola (325). To our surprise, there is no strong correlation between event occurrences and time-of-day nor day-of-week. The only exception here is Kiruna with a strong concentration of explosions at midnight hours. By taking first and second order deliveries of spatial histograms (seismicity plot) it is easy to identify the above mining areas particularly through the curvature plot. The events areal coverage for the respective mining areas amount to an aperture about 1 deg so accuracy is not unreasonable since bulletin production is automated. However, the strongest curvature are found for areas close to specific mine locations so we test this concept on other parts of Fennoscandia like W. Norway in order to locate the many quarries in industrialized areas. Proceedings of the Annual DoD/DOE Seismic Research Symposium (22nd): Planning for Verification of and Compliance with the Comprehensive Nuclear-Test-Ban Treaty (CTBT) held in New Orleans, Louisiana on 13-15 September 2000. U.S. Government or Federal Rights. The original document contains color images. Text Fennoscandia Kiruna Defense Technical Information Center: DTIC Technical Reports database Khibiny ENVELOPE(33.210,33.210,67.679,67.679) Kiruna Norway Orleans ENVELOPE(-60.667,-60.667,-63.950,-63.950) |
institution |
Open Polar |
collection |
Defense Technical Information Center: DTIC Technical Reports database |
op_collection_id |
ftdtic |
language |
English |
topic |
Seismology Seismic Detection and Detectors *PRIMARY WAVES(SEISMIC WAVES) NORTHERN EUROPE ARRAYS SEISMIC DETECTION MINING ENGINEERING SEISMIC DATA WAVE PROPAGATION CONFIGURATIONS EARTH CRUST SEISMIC WAVES EPICENTERS NORWAY AREA COVERAGE EARTH MANTLE SEISMOLOGICAL STATIONS SECONDARY WAVES PHASE VELOCITY SYMPOSIA MONITORING FOREIGN REPORTS SEISMICITY IMS(INTERNATION MONITORING SYSTEM) |
spellingShingle |
Seismology Seismic Detection and Detectors *PRIMARY WAVES(SEISMIC WAVES) NORTHERN EUROPE ARRAYS SEISMIC DETECTION MINING ENGINEERING SEISMIC DATA WAVE PROPAGATION CONFIGURATIONS EARTH CRUST SEISMIC WAVES EPICENTERS NORWAY AREA COVERAGE EARTH MANTLE SEISMOLOGICAL STATIONS SECONDARY WAVES PHASE VELOCITY SYMPOSIA MONITORING FOREIGN REPORTS SEISMICITY IMS(INTERNATION MONITORING SYSTEM) Husebye, Eystein S. Fedorenko, Yuri V. In Situ Monitoring of Local Seismicity |
topic_facet |
Seismology Seismic Detection and Detectors *PRIMARY WAVES(SEISMIC WAVES) NORTHERN EUROPE ARRAYS SEISMIC DETECTION MINING ENGINEERING SEISMIC DATA WAVE PROPAGATION CONFIGURATIONS EARTH CRUST SEISMIC WAVES EPICENTERS NORWAY AREA COVERAGE EARTH MANTLE SEISMOLOGICAL STATIONS SECONDARY WAVES PHASE VELOCITY SYMPOSIA MONITORING FOREIGN REPORTS SEISMICITY IMS(INTERNATION MONITORING SYSTEM) |
description |
An essential element of CTBT IMS monitoring is accurate epicenter locations. Recently, focus is on the IASPEI 1991 travel time tables which are not adequate for global usages due to strong upper mantle velocity variations in many regions. Related problems are network configurations (too few reporting stations) and persistent identification and pickings of secondary phases. For small array records, phase velocities can be estimated via f-k analysis but still differentiations between Pg-, PmP- and Pn-phases and likewise Sn- and Lg-phases remain problematic. In the latter case the issue is whether ray theory is adequate for describing wave propagation in the crustal wave guide. We are considering two approaches to the above problems; namely (i) to analyze existing monitoring performance using NORSAR GBF-bulletin data including use of close-in station records from the Khibiny and (ii) event discrimination in W. Norway. The GFB data cover 1999 and the total no of events were 7793 mainly stemming from Kiruna, Sweden (3544), Khibiny, Kola (956) and Zapolarny, Kola (325). To our surprise, there is no strong correlation between event occurrences and time-of-day nor day-of-week. The only exception here is Kiruna with a strong concentration of explosions at midnight hours. By taking first and second order deliveries of spatial histograms (seismicity plot) it is easy to identify the above mining areas particularly through the curvature plot. The events areal coverage for the respective mining areas amount to an aperture about 1 deg so accuracy is not unreasonable since bulletin production is automated. However, the strongest curvature are found for areas close to specific mine locations so we test this concept on other parts of Fennoscandia like W. Norway in order to locate the many quarries in industrialized areas. Proceedings of the Annual DoD/DOE Seismic Research Symposium (22nd): Planning for Verification of and Compliance with the Comprehensive Nuclear-Test-Ban Treaty (CTBT) held in New Orleans, Louisiana on 13-15 September 2000. U.S. Government or Federal Rights. The original document contains color images. |
author2 |
BERGEN UNIV (NORWAY) INST OF SOLID EARTH PHYSICS |
format |
Text |
author |
Husebye, Eystein S. Fedorenko, Yuri V. |
author_facet |
Husebye, Eystein S. Fedorenko, Yuri V. |
author_sort |
Husebye, Eystein S. |
title |
In Situ Monitoring of Local Seismicity |
title_short |
In Situ Monitoring of Local Seismicity |
title_full |
In Situ Monitoring of Local Seismicity |
title_fullStr |
In Situ Monitoring of Local Seismicity |
title_full_unstemmed |
In Situ Monitoring of Local Seismicity |
title_sort |
in situ monitoring of local seismicity |
publishDate |
2000 |
url |
http://www.dtic.mil/docs/citations/ADA530006 http://oai.dtic.mil/oai/oai?&verb=getRecord&metadataPrefix=html&identifier=ADA530006 |
long_lat |
ENVELOPE(33.210,33.210,67.679,67.679) ENVELOPE(-60.667,-60.667,-63.950,-63.950) |
geographic |
Khibiny Kiruna Norway Orleans |
geographic_facet |
Khibiny Kiruna Norway Orleans |
genre |
Fennoscandia Kiruna |
genre_facet |
Fennoscandia Kiruna |
op_source |
DTIC |
op_relation |
http://www.dtic.mil/docs/citations/ADA530006 |
op_rights |
Approved for public release; distribution is unlimited. |
_version_ |
1765997595683979264 |