Jeffrey T. Freymueller Visited College of Earth Sciences and gave a talk titled "Separating hydrologic, cryospheric and tectonic deformation: Examples from Alaska and the Tibetan Plateau" in meeting room of Key Laboratory of Computational Geodynamics,CAS on Dec. 20,2011.
Jeffrey T. Freymueller Visited College of Earth Sciences and gave a talk titled "Separating hydrologic, cryospheric and tectonic deformation: Examples from Alaska and the Tibetan Plateau" in meeting room of Key Laboratory of Computational Geodynamics,CAS on Dec. 20,2011.
Professor Araya Akito visited College of Earth Sciences and gave a talk titled "Broadband geophysical observation using a laser interferometer" in 704 in teaching building on Mar. 1st, 2012.
A laser interferometer is widely used in physics, engineering, astronomy, metrology, and so on, for precise measurements. It is useful also in geophysics because it provides precise standard of length which can be used for measurements of crustal deformation. A couple of its geophysical application, a laser strainmeter and a compact absolute gravimeter, will be presented. The laser strainmeter is in operation at Kamioka mine located 1000-m underground, and measures long-term strain changes as well as seismic motion of the ground. We have observed several coseismic strain steps with the resolution of ~10^{-10} in strain, and they can be used for determining seismic moment geodetically even for deep or ocean earthquakes. An absolute gravimeter is used for determining gravity acceleration which gives information on ground density distribution and movement of underground mass. We have been developing a compact absolute gravimeter for the purpose of volcanic observation detecting motion of magma. Current performance of the instrument and its observation before and after the Tohoku earthquake are introduced.
Professor Araya Akito visited College of Earth Sciences and gave a talk titled "Broadband geophysical observation using a laser interferometer" in 704 in teaching building on Mar. 1st, 2012.
A laser interferometer is widely used in physics, engineering, astronomy, metrology, and so on, for precise measurements. It is useful also in geophysics because it provides precise standard of length which can be used for measurements of crustal deformation. A couple of its geophysical application, a laser strainmeter and a compact absolute gravimeter, will be presented. The laser strainmeter is in operation at Kamioka mine located 1000-m underground, and measures long-term strain changes as well as seismic motion of the ground. We have observed several coseismic strain steps with the resolution of ~10^{-10} in strain, and they can be used for determining seismic moment geodetically even for deep or ocean earthquakes. An absolute gravimeter is used for determining gravity acceleration which gives information on ground density distribution and movement of underground mass. We have been developing a compact absolute gravimeter for the purpose of volcanic observation detecting motion of magma. Current performance of the instrument and its observation before and after the Tohoku earthquake are introduced.
Doctor Weijia Kuang was invited to give a talk "Geomagnetic Variability and Predictability" in meeting room of Key Laboratory of Computational Geodynamics,CAS on Feb. 22, 2012.
Weijia Kuang
Research
Research
* Origins of Earth and planetary magnetic fields (geodynamo and planetary dynamo theories): numerical simulation of dynamical processes in the Earth's and planetary cores, and planetary magnetic evolution;
* Geomagnetic data assimilation: combining surface observations and dynamical models to predict geomagnetic secular variation, and to estimate the core state;
* Geomagnetic/geodynamo applications: time-varying geodetic observables (gravity field, Earth's angular momentum) arising from solid Earth and liquid core interactions;
* General computational fluid dynamics and nonlinear differential equations: numerical algorithm development, parallel and grid computation, ensemble analysis.
Positions and Appointments
12/02 - Present Geophysicist/Applied Mathematician, NASA GSFC
12/02 - Present Fellow, JCET, University of Maryland, Baltimore County
06/98 - 11/02 Research Associate Professor, JCET/UMBC
04/92 - 05/97 Research Associate/Post doctoral fellow, Harvard University
Education
Ph.D., Applied Mathematics, University of California, Los Angeles, 1992
M.Sc., Physics, Wuhan University, China, 1985 (Honor)
B.Sc., Space Engineering Science, Changsha Institute of Technology, China,1982
* Geomagnetic data assimilation: combining surface observations and dynamical models to predict geomagnetic secular variation, and to estimate the core state;
* Geomagnetic/geodynamo applications: time-varying geodetic observables (gravity field, Earth's angular momentum) arising from solid Earth and liquid core interactions;
* General computational fluid dynamics and nonlinear differential equations: numerical algorithm development, parallel and grid computation, ensemble analysis.
Positions and Appointments
12/02 - Present Geophysicist/Applied Mathematician, NASA GSFC
12/02 - Present Fellow, JCET, University of Maryland, Baltimore County
06/98 - 11/02 Research Associate Professor, JCET/UMBC
04/92 - 05/97 Research Associate/Post doctoral fellow, Harvard University
Education
Ph.D., Applied Mathematics, University of California, Los Angeles, 1992
M.Sc., Physics, Wuhan University, China, 1985 (Honor)
B.Sc., Space Engineering Science, Changsha Institute of Technology, China,1982
Doctor Weijia Kuang was invited to give a talk "Geomagnetic Variability and Predictability" in meeting room of Key Laboratory of Computational Geodynamics,CAS on Feb. 22, 2012.
Weijia Kuang
Research
Research
* Origins of Earth and planetary magnetic fields (geodynamo and planetary dynamo theories): numerical simulation of dynamical processes in the Earth's and planetary cores, and planetary magnetic evolution;
* Geomagnetic data assimilation: combining surface observations and dynamical models to predict geomagnetic secular variation, and to estimate the core state;
* Geomagnetic/geodynamo applications: time-varying geodetic observables (gravity field, Earth's angular momentum) arising from solid Earth and liquid core interactions;
* General computational fluid dynamics and nonlinear differential equations: numerical algorithm development, parallel and grid computation, ensemble analysis.
Positions and Appointments
12/02 - Present Geophysicist/Applied Mathematician, NASA GSFC
12/02 - Present Fellow, JCET, University of Maryland, Baltimore County
06/98 - 11/02 Research Associate Professor, JCET/UMBC
04/92 - 05/97 Research Associate/Post doctoral fellow, Harvard University
Education
Ph.D., Applied Mathematics, University of California, Los Angeles, 1992
M.Sc., Physics, Wuhan University, China, 1985 (Honor)
B.Sc., Space Engineering Science, Changsha Institute of Technology, China,1982
* Geomagnetic data assimilation: combining surface observations and dynamical models to predict geomagnetic secular variation, and to estimate the core state;
* Geomagnetic/geodynamo applications: time-varying geodetic observables (gravity field, Earth's angular momentum) arising from solid Earth and liquid core interactions;
* General computational fluid dynamics and nonlinear differential equations: numerical algorithm development, parallel and grid computation, ensemble analysis.
Positions and Appointments
12/02 - Present Geophysicist/Applied Mathematician, NASA GSFC
12/02 - Present Fellow, JCET, University of Maryland, Baltimore County
06/98 - 11/02 Research Associate Professor, JCET/UMBC
04/92 - 05/97 Research Associate/Post doctoral fellow, Harvard University
Education
Ph.D., Applied Mathematics, University of California, Los Angeles, 1992
M.Sc., Physics, Wuhan University, China, 1985 (Honor)
B.Sc., Space Engineering Science, Changsha Institute of Technology, China,1982
Professor Zuyuan He was invited to give a talk "Distributed optical fiber sensing technology and its application in the crustal deformation monitoring" in meeting room of Key Laboratory of Computational Geodynamics,CAS on Feb. 28, 2012.
Professor Zuyuan He was invited to give a talk "Distributed optical fiber sensing technology and its application in the crustal deformation monitoring" in meeting room of Key Laboratory of Computational Geodynamics,CAS on Feb. 28, 2012.