• 제목/요약/키워드: Geodynamics

검색결과 30건 처리시간 0.022초

Consistency of PPP GPS and strong-motion records: case study of Mw9.0 Tohoku-Oki 2011 earthquake

  • Psimoulis, Panos;Houlie, Nicolas;Meindl, Michael;Rothacher, Markus
    • Smart Structures and Systems
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    • 제16권2호
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    • pp.347-366
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    • 2015
  • GPS and strong-motion sensors are broadly used for the monitoring of structural health and Earth surface motions, focusing on response of structures, earthquake characterization and rupture modeling. Several studies have shown the consistency of the two data sets within at certain frequency (e.g., 0.03

Geoid of Western Mongolia from airborne gravity data 2004

  • Forsberg, Rene;Olesen, A.;Dalkhaa, Munkhtsetseg;Begzsuren, Amarzaya
    • 한국지형공간정보학회:학술대회논문집
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    • 한국지형공간정보학회 2005년도 아시아 태평양 국제 GSIS 학술발표회
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    • pp.93-99
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    • 2005
  • This paper summarizes a preliminary geoid computation for western Mongolia, utilizing the airborne data collected fall 2004, as part of the NGA-DNSC-ALAGaC-MonMap cooperative airborne gravity project. A gravimetric geoid has been computed using the airborne gravity data, SRTM terrain models and GRACE/EGM global fields. The gravimetric geoid has subsequently been fitted to GPS-leveling data across Western Mongolia, as well as for a special Ulaanbaatar city geoid model.

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한반도의 조구조 진화 (Phanerozoic Geodynamics of the Korean Peninsula)

  • 민경덕;이윤수
    • 자원환경지질
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    • 제39권4호
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    • pp.353-368
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    • 2006
  • 지난 25년간 이룩된 지질학의 제분야의 발전으로 그동안 지역적으로 이해되어 온 지질과정과 현상을 시공간으로 폭넓게 대비할 수 있게 되었으며, 그 조구조를 일으킨 기작들에 대해서도 조금씩 규명되고 있다. 본 연구는 현생이언에 있어서 한반도 일원에 대한 조구조 정립에 기여할 목적으로 이루어졌으며, 한반도를 포함한 동아시아의 형성 과정과 그 기작에 초점을 맞추어, 최근에 발표된 관련 연구들을 중심으로 논하고자 한다.

Direct Conversion Sintering of Super-hard Nano-polycrystalline Diamond from Graphite

  • Sumiya, Hitoshi;Irifune, Tetsuo
    • 한국분말야금학회:학술대회논문집
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    • 한국분말야금학회 2006년도 Extended Abstracts of 2006 POWDER METALLURGY World Congress Part2
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    • pp.1309-1310
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    • 2006
  • High-purity and super-hard nano-polycrystalline diamond has been successfully synthesized by direct conversion from high-purity graphite under static pressures above 15 GPa and temperatures above $2300^{\circ}C$. This paper describes research findings on the formation mechanism of nano-structure and on the contributing factor leading to high hardness.

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Analysis of CHAMP Magnetic Anomalies for Polar Geodynamic Variations

  • Kim Hyung Rae;von Frese Ralph R.B.;Park Chan-Hong;Kim Jeong Woo
    • 대한원격탐사학회지
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    • 제21권1호
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    • pp.91-98
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    • 2005
  • On board satellite magnetometer measures all possible magnetic components, such as the core and crustal components from the inner Earth, and magnetospheric, ionospheric and' its coupled components from the outer Earth. Due to its dipole and non-dipole features, separation of the respective component from the measurements is most difficult unless the comprehensive knowledge of each field characteristics and the consequent modeling methods are solidly constructed. Especially, regional long wavelength magnetic signals of the crust are strongly masked by the main field and dynamic external field and hence difficult to isolate in the satellite measurements. In particular, the un-modeled effects of the strong auroral external fields and the complicated behavior of the core field near the geomagnetic poles conspire to greatly reduce the crustal magnetic signal-to-noise ratio in the polar region relative to the rest of the Earth. We can, however, use spectral correlation theory to filter the static lithospheric and core field components from the dynamic external field effects that are closely related to the geomagnetic storms affecting ionospheric current disturbances. To help isolate regional lithospheric anomalies from core field components, the correlations between CHAMP magnetic anomalies and the pseudo-magnetic effects inferred from satellite gravity-derived crustal thickness variations can also be exploited, Isolation of long wavelengths resulted from the respective source is the key to understand and improve the models of the external magnetic components as well as of the lower crustal structures. We expect to model the external field variations that might also be affected by a sudden upheaval like tsunami by using our algorithm after isolating any internal field components.