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'''Forensic seismology''' is the [[forensic]] use of the techniques of [[seismology]] to detect and study distant phenomena, particularly [[explosion]]s, including those of [[nuclear weapons]].<ref name="RogersKoper">{{cite web|url=http://web.mst.edu/~rogersda/umrcourses/ge342/Forensic%20Seismology-revised.pdf|title=Some Practical Applications of Forensic Seismology|author=J. David Rogers and Keith D. Koper|accessdate=2011-09-09}}</ref>
'''Forensic seismology''' is the [[forensic]] use of the techniques of [[seismology]] to detect and study distant phenomena, particularly [[explosion]]s, including those of [[nuclear weapons]].<ref name="RogersKoper">{{cite web|url=http://web.mst.edu/~rogersda/umrcourses/ge342/Forensic%20Seismology-revised.pdf|title=Some Practical Applications of Forensic Seismology|author=J. David Rogers and Keith D. Koper|access-date=2011-09-09}}</ref>


Because of the efficiency with which seismic waves propagate through the Earth and the technical difficulties of decoupling explosions to diminish their seismic radiation, forensic seismology is a critical technique in the enforcement of bans on [[underground nuclear testing]].<ref>{{cite web|url=https://str.llnl.gov/str/Zucca.html|title=Forensic Seismology Supports CTBT|date=September 1998|website=|publisher=Lawrence Livermore National Laboratory|author=John J. Zucca|accessdate=2011-09-09}}</ref>
Because of the efficiency with which seismic waves propagate through the Earth and the technical difficulties of decoupling explosions to diminish their seismic radiation, forensic seismology is a critical technique in the enforcement of bans on [[underground nuclear testing]].<ref>{{cite web|url=https://str.llnl.gov/str/Zucca.html|title=Forensic Seismology Supports CTBT|date=September 1998|publisher=Lawrence Livermore National Laboratory|author=John J. Zucca|access-date=2011-09-09|archive-date=2013-11-03|archive-url=https://web.archive.org/web/20131103213021/https://www.llnl.gov/str/Zucca.html|url-status=dead}}</ref>


In addition to nuclear explosions, the signatures of many other kinds of explosions <ref>Koper, K. D., T. C. Wallace, and R. C. Aster (2003), Seismic recordings of the Carlsbad, New Mexico, pipeline explosion of 19 August 2000, Bulletin of the Seismological Society of America, 93(4), 1427-1432
In addition to nuclear explosions, the signatures of many other kinds of explosions<ref>Koper, K. D., T. C. Wallace, and R. C. Aster (2003), Seismic recordings of the Carlsbad, New Mexico, pipeline explosion of 19 August 2000, Bulletin of the Seismological Society of America, 93(4), 1427–1432
</ref> can also be detected and analyzed by forensic seismology,<ref name="RogersKoper"/> and even other phenomena such as ocean waves (the global [[microseism]]), the movement of icebergs across the sea floor or in collision with other icebergs,<ref>Martin, S., R. Drucker, R. Aster, F. Davey, E. Okal, T. Scambos, and D. MacAyeal (2010), Kinematic and seismic analysis of giant tabular iceberg breakup at Cape Adare, Antarctica, Journal of Geophysical Research-Solid Earth, 115, doi:10.1029/2009JB006700</ref> or explosions within submarines.<ref>{{cite web|url=http://www.cosmosmagazine.com/features/online/2604/forensic-seismology|title=Forensic seismology|date=5 March 2009|author=Richard A. Lovett|publisher=COSMOS magazine|access-date=9 September 2011|archive-url=https://web.archive.org/web/20110309194419/http://www.cosmosmagazine.com/features/online/2604/forensic-seismology|archive-date=9 March 2011|url-status=dead}}</ref><ref>{{cite web|url=http://www.agiweb.org/geotimes/feb01/kursk.html|title=Sinking the Kursk|publisher=GeoTimes|author=Christina Reed|date=February 2001|accessdate=2011-09-09}}</ref>
</ref> can also be detected and analyzed by forensic seismology,<ref name="RogersKoper"/> and even other phenomena such as ocean waves (the global [[microseism]]), the movement of icebergs across the sea floor or in collision with other icebergs,<ref>Martin, S., R. Drucker, R. Aster, F. Davey, E. Okal, T. Scambos, and D. MacAyeal (2010), Kinematic and seismic analysis of giant tabular iceberg breakup at Cape Adare, Antarctica, Journal of Geophysical Research-Solid Earth, 115, doi:10.1029/2009JB006700</ref> or explosions within submarines.<ref>{{cite web|url=http://www.cosmosmagazine.com/features/online/2604/forensic-seismology|title=Forensic seismology|date=5 March 2009|author=Richard A. Lovett|publisher=COSMOS magazine|access-date=9 September 2011|archive-url=https://web.archive.org/web/20110309194419/http://www.cosmosmagazine.com/features/online/2604/forensic-seismology|archive-date=9 March 2011|url-status=dead}}</ref><ref>{{cite web|url=http://www.agiweb.org/geotimes/feb01/kursk.html|title=Sinking the Kursk|publisher=GeoTimes|author=Christina Reed|date=February 2001|access-date=2011-09-09}}</ref>


Organizations with expertise in forensic seismology include [[AWE Blacknest]], [[Los Alamos National Laboratory]], [[Sandia National Laboratory]], and [[Lawrence Livermore National Laboratory]].
Organizations with expertise in forensic seismology include [[AWE Blacknest]], [[Los Alamos National Laboratory]], [[Sandia National Laboratory]], and [[Lawrence Livermore National Laboratory]].
Line 10: Line 10:
== Seismic detection of nuclear detonations ==
== Seismic detection of nuclear detonations ==


Forensic Seismology is one of several other methods used by the [[global community]] to determine compliance with the [[Comprehensive Nuclear-Test-Ban Treaty|Comprehensive Nuclear Test-Ban Treaty]] (CTBT). A network of approximately 170 seismic stations, along with data generated from sources such as [[infrasound]], [[hydroacoustics]], and [[radionuclide]] detection, is used to identify and locate nuclear detonations.<ref name=":0">{{Cite web|url=https://str.llnl.gov/str/Zucca.html|title=Forensic Seismology Supports CTBT|website=str.llnl.gov|access-date=2017-04-23}}</ref> Forensic seismology is specifically used to locate nuclear detonations that may have occurred underneath the ground.
Forensic Seismology is one of several other methods used by the [[global community]] to determine compliance with the [[Comprehensive Nuclear-Test-Ban Treaty|Comprehensive Nuclear Test-Ban Treaty]] (CTBT). A network of approximately 170 seismic stations, along with data generated from sources such as [[infrasound]], [[hydroacoustics]], and [[radionuclide]] detection, is used to identify and locate nuclear detonations.<ref name=":0">{{Cite web|url=https://str.llnl.gov/str/Zucca.html|title=Forensic Seismology Supports CTBT|website=str.llnl.gov|access-date=2017-04-23|archive-date=2013-11-03|archive-url=https://web.archive.org/web/20131103213021/https://www.llnl.gov/str/Zucca.html|url-status=dead}}</ref> Forensic seismology is specifically used to locate nuclear detonations that may have occurred underneath the ground.


Seismic stations record underground pressure waves and transmit this data for processing via secure communication links. There are many challenges involved with trying to differentiate a nuclear explosion from other natural and man-made phenomena, such as earthquakes, mining explosions, and construction.<ref name=":0" /> Nuclear explosions exceeding 150 kilotons generate pressure waves that primarily travel through the Earth's core and mantle.<ref name=":0" /> These types of explosions are straightforward to identify because the mixture of rock the signals pass through is fairly [[Homogeneity and heterogeneity|homogeneous]] and the signals generated are free from [[Noise (electronics)|noise]]. Smaller nuclear explosions are more difficult to identify because pressure waves primarily travel through the Earth's [[upper mantle (Earth)|upper mantle]] and crust, leading to signal distortion due to the heterogeneity of rocks at this depth.<ref name=":0" />
Seismic stations record underground pressure waves and transmit this data for processing via secure communication links. There are many challenges involved with trying to differentiate a nuclear explosion from other natural and man-made phenomena, such as earthquakes, mining explosions, and construction.<ref name=":0" /> Nuclear explosions exceeding 150 kilotons generate pressure waves that primarily travel through the Earth's core and mantle.<ref name=":0" /> These types of explosions are straightforward to identify because the mixture of rock the signals pass through is fairly [[Homogeneity and heterogeneity|homogeneous]] and the signals generated are free from [[Noise (electronics)|noise]]. Smaller nuclear explosions are more difficult to identify because pressure waves primarily travel through the Earth's [[upper mantle (Earth)|upper mantle]] and crust, leading to signal distortion due to the heterogeneity of rocks at this depth.<ref name=":0" />


Nations may also conduct clandestine underground tests that are not easily identifiable. One method of hiding an underground nuclear detonation is called decoupling. This involves detonating a nuclear warhead in an underground cavity in order to significantly muffle the amplitude of the subsequent underground pressure waves.<ref name=":0" /> Another proposed method of hiding nuclear detonations is called [[mine masking]]. This technique uses a larger explosion to mask a smaller nuclear explosion.<ref name=":1">{{Cite book|url=https://www.nap.edu/read/12849/chapter/13#173|title=APPENDIX E Dealing with Evasive Underground Nuclear Testing {{!}} The Comprehensive Nuclear Test Ban Treaty: Technical Issues for the United States {{!}} The National Academies Press|year=2012|language=en|doi=10.17226/12849|hdl=2027/mdp.39015041921126|isbn=978-0-309-14998-3}}</ref> The feasibility of mine masking has been called into question because seismic events large enough to mask a nuclear explosion are exceedingly rare and would draw suspicion.<ref name=":1" /> Smaller nuclear detonation yields may also be hard to detect because they produce readings similar to small earthquakes or other natural events.<ref name=":1" />
Nations may also conduct clandestine underground tests that are not easily identifiable. One method of hiding an underground nuclear detonation is called decoupling. This involves detonating a nuclear warhead in an underground cavity in order to significantly muffle the amplitude of the subsequent underground pressure waves.<ref name=":0" /> Another proposed method of hiding nuclear detonations is called [[mine masking]]. This technique uses a larger explosion to mask a smaller nuclear explosion.<ref name=":1">{{Cite book|url=https://www.nap.edu/read/12849/chapter/13#173|title=APPENDIX E Dealing with Evasive Underground Nuclear Testing {{!}} The Comprehensive Nuclear Test Ban Treaty: Technical Issues for the United States {{!}} The National Academies Press|year=2012|doi=10.17226/12849|hdl=2027/mdp.39015041921126|isbn=978-0-309-14998-3}}</ref> The feasibility of mine masking has been called into question because seismic events large enough to mask a nuclear explosion are exceedingly rare and would draw suspicion.<ref name=":1" /> Smaller nuclear detonation yields may also be hard to detect because they produce readings similar to small earthquakes or other natural events.<ref name=":1" />


When seismic data is gathered, it has to be processed to produce meaningful information. [[Algorithm]]s are used to isolate patterns, remove noise, and generate estimates. The development of efficient algorithms for nuclear detonation detection has led to many advancements in other fields such as [[kriging]], an advanced method of [[interpolation]] used primarily in [[geostatistics]].<ref name=":0" /> Algorithms are used to identify key characteristics of wave forms, such as peak-to-peak distance, amplitude, phase, [[P-wave]] amplitude, and [[S-wave]] amplitude. P-waves, or primary waves, are compression waves that propagate quickly through rock, and are generally the first waves to reach seismic stations.<ref name=":0" /> S-waves, or shear waves, arrive after P-waves. The ratio of P to S waves is one of several important values used to characterize seismic events. When a nuclear detonation has been identified, algorithms are used to estimate the detonation time, explosive yield and depth of burial.<ref>{{Cite book|title=Forensic Seismology and Nuclear Test Bans|last=Douglas|first=Alan|publisher=Cambridge University Press|year=2017|isbn=9781107033948|location=|pages=}}</ref>
When seismic data is gathered, it has to be processed to produce meaningful information. [[Algorithm]]s are used to isolate patterns, remove noise, and generate estimates. The development of efficient algorithms for nuclear detonation detection has led to many advancements in other fields such as [[kriging]], an advanced method of [[interpolation]] used primarily in [[geostatistics]].<ref name=":0" /> Algorithms are used to identify key characteristics of wave forms, such as peak-to-peak distance, amplitude, phase, [[P wave]] amplitude, and [[S wave]] amplitude. P-waves, or primary waves, are compression waves that propagate quickly through rock, and are generally the first waves to reach seismic stations.<ref name=":0" /> S-waves, or shear waves, arrive after P-waves. The ratio of P to S waves is one of several important values used to characterize seismic events. When a nuclear detonation has been identified, algorithms are used to estimate the detonation time, explosive yield and depth of burial.<ref>{{Cite book|title=Forensic Seismology and Nuclear Test Bans|last=Douglas|first=Alan|publisher=Cambridge University Press|year=2017|isbn=9781107033948}}</ref><ref>Dahlman, Ola and Hans Israelson. Monitoring Underground Nuclear Explosions. New York: Elsevier, 1977,440pp.</ref>


== References ==
== References ==

Latest revision as of 03:11, 5 November 2024

Forensic seismology is the forensic use of the techniques of seismology to detect and study distant phenomena, particularly explosions, including those of nuclear weapons.[1]

Because of the efficiency with which seismic waves propagate through the Earth and the technical difficulties of decoupling explosions to diminish their seismic radiation, forensic seismology is a critical technique in the enforcement of bans on underground nuclear testing.[2]

In addition to nuclear explosions, the signatures of many other kinds of explosions[3] can also be detected and analyzed by forensic seismology,[1] and even other phenomena such as ocean waves (the global microseism), the movement of icebergs across the sea floor or in collision with other icebergs,[4] or explosions within submarines.[5][6]

Organizations with expertise in forensic seismology include AWE Blacknest, Los Alamos National Laboratory, Sandia National Laboratory, and Lawrence Livermore National Laboratory.

Seismic detection of nuclear detonations

[edit]

Forensic Seismology is one of several other methods used by the global community to determine compliance with the Comprehensive Nuclear Test-Ban Treaty (CTBT). A network of approximately 170 seismic stations, along with data generated from sources such as infrasound, hydroacoustics, and radionuclide detection, is used to identify and locate nuclear detonations.[7] Forensic seismology is specifically used to locate nuclear detonations that may have occurred underneath the ground.

Seismic stations record underground pressure waves and transmit this data for processing via secure communication links. There are many challenges involved with trying to differentiate a nuclear explosion from other natural and man-made phenomena, such as earthquakes, mining explosions, and construction.[7] Nuclear explosions exceeding 150 kilotons generate pressure waves that primarily travel through the Earth's core and mantle.[7] These types of explosions are straightforward to identify because the mixture of rock the signals pass through is fairly homogeneous and the signals generated are free from noise. Smaller nuclear explosions are more difficult to identify because pressure waves primarily travel through the Earth's upper mantle and crust, leading to signal distortion due to the heterogeneity of rocks at this depth.[7]

Nations may also conduct clandestine underground tests that are not easily identifiable. One method of hiding an underground nuclear detonation is called decoupling. This involves detonating a nuclear warhead in an underground cavity in order to significantly muffle the amplitude of the subsequent underground pressure waves.[7] Another proposed method of hiding nuclear detonations is called mine masking. This technique uses a larger explosion to mask a smaller nuclear explosion.[8] The feasibility of mine masking has been called into question because seismic events large enough to mask a nuclear explosion are exceedingly rare and would draw suspicion.[8] Smaller nuclear detonation yields may also be hard to detect because they produce readings similar to small earthquakes or other natural events.[8]

When seismic data is gathered, it has to be processed to produce meaningful information. Algorithms are used to isolate patterns, remove noise, and generate estimates. The development of efficient algorithms for nuclear detonation detection has led to many advancements in other fields such as kriging, an advanced method of interpolation used primarily in geostatistics.[7] Algorithms are used to identify key characteristics of wave forms, such as peak-to-peak distance, amplitude, phase, P wave amplitude, and S wave amplitude. P-waves, or primary waves, are compression waves that propagate quickly through rock, and are generally the first waves to reach seismic stations.[7] S-waves, or shear waves, arrive after P-waves. The ratio of P to S waves is one of several important values used to characterize seismic events. When a nuclear detonation has been identified, algorithms are used to estimate the detonation time, explosive yield and depth of burial.[9][10]

References

[edit]
  1. ^ a b J. David Rogers and Keith D. Koper. "Some Practical Applications of Forensic Seismology" (PDF). Retrieved 2011-09-09.
  2. ^ John J. Zucca (September 1998). "Forensic Seismology Supports CTBT". Lawrence Livermore National Laboratory. Archived from the original on 2013-11-03. Retrieved 2011-09-09.
  3. ^ Koper, K. D., T. C. Wallace, and R. C. Aster (2003), Seismic recordings of the Carlsbad, New Mexico, pipeline explosion of 19 August 2000, Bulletin of the Seismological Society of America, 93(4), 1427–1432
  4. ^ Martin, S., R. Drucker, R. Aster, F. Davey, E. Okal, T. Scambos, and D. MacAyeal (2010), Kinematic and seismic analysis of giant tabular iceberg breakup at Cape Adare, Antarctica, Journal of Geophysical Research-Solid Earth, 115, doi:10.1029/2009JB006700
  5. ^ Richard A. Lovett (5 March 2009). "Forensic seismology". COSMOS magazine. Archived from the original on 9 March 2011. Retrieved 9 September 2011.
  6. ^ Christina Reed (February 2001). "Sinking the Kursk". GeoTimes. Retrieved 2011-09-09.
  7. ^ a b c d e f g "Forensic Seismology Supports CTBT". str.llnl.gov. Archived from the original on 2013-11-03. Retrieved 2017-04-23.
  8. ^ a b c APPENDIX E Dealing with Evasive Underground Nuclear Testing | The Comprehensive Nuclear Test Ban Treaty: Technical Issues for the United States | The National Academies Press. 2012. doi:10.17226/12849. hdl:2027/mdp.39015041921126. ISBN 978-0-309-14998-3.
  9. ^ Douglas, Alan (2017). Forensic Seismology and Nuclear Test Bans. Cambridge University Press. ISBN 9781107033948.
  10. ^ Dahlman, Ola and Hans Israelson. Monitoring Underground Nuclear Explosions. New York: Elsevier, 1977,440pp.
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