Knowledge of the variation crustal thickness is essential in many applications, such as forward dynamic modelling, numerical heat flow calculations, seismologic applications and geohistory reconstructions. We present a 3-D model Moho undulations over entire Tibetan plateau derived from gravity inversion. The field has been obtained by using Gravity Recovery Climate Experiment (GRACE) potential development which integrated with terrestrial data, presently best available studied area. For...

Abstract The determination of the crustal structure is essential in geophysics, as it gives insight into geohistory, tectonic environment, geohazard mitigation, etc. Here we present latest advance on three-dimensional modeling representing Tibetan Mohorovičić discontinuity (topography and ranges) its deformation (fold), revealed by analyzing gravity data from GOCE mission. Our study shows noticeable advances estimated Moho model which superior to results using earlier models prior GOCE....

Integration of geological and geophysical data is essential to elucidate the configuration geometry surface subsurface structures, as well their long-term evolution. The NNW–SSE-striking incised valley parallel mountain range in southeastern margin Korean Peninsula, extending 50 km from Gyeongju Ulsan cities, are together regarded one most prominent geographical features South Korea. This paper presents an investigation into structural architecture deformation history during late Cenozoic...

Although the prevailing wavelength of Moho fold has been estimated from spectral analysis gravity and topography, there not a suggested method developed to reveal its structure. Here we present three‐dimensional (3D) structure beneath Tibet which clearly reflects continental collision. For estimation new introduced based on inversion flexural model. The direction are consistent with velocities calculated Global Positioning System (GPS) an elastic plate model under horizontal compression. is...

Terra Nova, 24, 295–300, 2012 Abstract We present the first analysis on crustal deformation in Korean peninsula by 2011 Tohoku earthquake. The great Mw 9.0 earthquake extended along E–W direction even though it is at a distance longer than one thousand kilometres from epicentre. coseismic surface displacements 1.0 cm (in southwestern part) to 5.4 eastern were detected continuous GPS observation. estimated strains correspond approximately 6–28 years of accumulated peninsula. postseismic...

The objective of the FATWELDHSS project was to study post-weld treatment techniques and their effect on fatigue life MAG welded attachments in High Strength Steel (HSS). Fatigue cracks steel structures often occur at joints, where stress concentrations due joint geometry tensile residual stresses are relatively high. improvement techniques, which rely improving field and/or surface around generally known be beneficial. Therefore, within framework this project, following were examined: diode...

To estimate the tectonic displacement of Chugaryeong Fault System (CFS), gravity surveys were conducted along Dongducheon fault (DF) and Wangsukcheon (WF).A total 1,100 stations for DF WF regions have been added to current database.The results interpretation indicate that (1) dextral is about 3,000 m, similar (2,900-3,100 m) shown in geological map.(2) The 3,200 m. (3) Taken together, CFS estimated be m on average.To investigate more accurate CFS, further planned Pocheon fault, Gyeonggang Inje fault.

Compression near collisional plate boundaries causes lithospheric folding which results in the decrease of pressure beneath ridge fold while trough increases. The decompression lithosphere is likely to bring on basaltic magmatism along and below ridge. We investigate subsurface structure Jeju (Cheju) volcanic island its vicinity, propose an alternative hypothesis that magma could be caused by (episodic) folding. Unlike prevailing intraplate requires extending lithosphere, our can explain how...

NMC 몰랜드 광산은 고생대 조선누층군을 관입한 화성암류에 의해 형성된 접촉교대 또는 스카른 광상으로 공간적으로 제천화강암과 인접해 있어 이 화강암을 관계 화성암으로 간주하여 대보 화성 활동과 관련하여 해석하였으나, 최근에는 백악기 천부 반화강암질 암체에서 기원된 광화유체로부터 스카른화작용과 더불어 Mo 광화작용이 진행된 것이라는 해석이 제시되었다. 본 연구에서는 광산 일원에 대한 중력탐사를 통해 지하구조를 해석함으로써, 지표 지질에서 제천화강암이 광산에 훨씬 인접한 것과는 달리 지하에서는 남쪽의 무암사화강암이 하부와 주변으로까지 뻗어있을 것으로 여겨지며, 결과적으로 광상 형성의 작용하였을 것임을 제시한다. Moland mine, which is classified as a contact replacement or skarn deposit, has been interpreted to have formed by Daebo igneous activity intruded into...

AbstractWe developed a spherical harmonic series that represents the gravitational potential and its gravity field due to buried right vertical cylinder. This can be used at far- intermediate-regions, is fast accurate, using only few terms. We compared values of fields acquired by this new series, with ones computed direct numerical integrations, fine-mesh structure for Results calculations are shown performances two different methods compared. Faithfulness tested an inversion example.In...

Abstract The growth mechanism of the Tibetan Plateau, postulated by a number hypotheses, remains under intense debate. Our analysis recent satellite‐based gravity model reveals that lithosphere has been decoupled and folded. It is further evidenced existence crustal melts channel flow have observed seismic magnetotelluric explorations. Based on 3D geodynamic simulations, we elucidate exact buckling structures in upper crust lithospheric mantle: at mixed wavelengths between ∼240 ∼400 km,...

Gravity exploration was conducted to determine the distribution of igneous complex related lithium pegmatite in Boam deposit Uljin, Gyeongsangbuk-do, and spatial relationship with regional geology ore bodies were studied.The gravity result shows that area is characterized by relatively low anomaly surrounds deposit.The located near southwest-northeast directional boundary anomalies where (granite gneiss) contacts Yuli Wonnam groups southeast, Janggun limestone layers east-west direction,...

Gravity data were analyzed to identify the cause of clustered seismicity that occurred intensively in Yeoncheon, located central part Korean Peninsula.Our analysis suggests En echelon faults developed northwest-southeast direction.In addition, eastern Dongducheon Fault, it was interpreted high-density lower bedrock intermittently lifts close surface due vertical tectonic movement accompanied by a flower structure.The fracture zone Fault is estimated width about 200 m, depth at least 5 km,...

To analyze the tectonic movements of Geumwang Fault and its association with development Pungam Basin, distributions gravity field aeromagnetic were interpreted.The low zone (LGZ) around shows an asymmetrical distribution, indicating sinistral (left-lateral) movement left side fault moving southeastward.The observed anomaly suggests a displacement approximately 9.3 km.The distribution supports this horizontal very distinct magnetic characteristics.Using Euler deconvolution, average depth was...

태백산광화대는 우리나라에서 가장 중요한 광화대임에도 불구하고 이 지역에서의 중력 탐사는 2015년이 되어서야 시작되었다. 석회암 지대를 화강암질 마그마가 관입하면서 스카른과 열수광상을 많이 형성하게 되므로 광상을 효율적으로 개발하기 위해서는 화강암질암의 공간적 분포를 파악하는 것이 필요하다. 화강암질암은 석회암에 비해 밀도가 뚜렷하게 낮기 때문에 탐사를 통해 넓은 지역의 빠르고 쉽게 파악할 수 있다. 태백산광화대의 광산들은 열수 혹은 마그마의 온도가 비슷한 조건에서의 화강암체와 석회암의 경계로 해석될 있는 낮은 중력이상의 가장자리를 따라 분포하는 특징을 보여주고 있음을 주목할 만하다. 상동광산은 비록 관계화강암이 지표에 드러나지는 않았지만 중력이상을 통해서 지하에 큰 규모로 분포하고 것으로 볼 있는데, 이는 인근의 거도광산 주변에 드러난 어평화강암보다 훨씬 더 규모일 추정된다. 이와 같이 화강암체가 드러나지 않는 지역에 발달한 다른 광상들도 보여줌으로써 나타내며, 또한...

KIGAM has surveyed most of the Korean territory since 1982 using airborne gamma-ray spectrometry, and complete nationwide scale map in near future. However, duration survey is too long conditions not consistent, data does have physical consistency. In addition, window counts (count/sec) were recorded instead potassium, uranium thorium radioelement concentrations. Thus, could be registered to International Atomic Energy Agency (IAEA) datum. This limits usefulness it possible easily combine...

Position data are important in many science and technology studies.In particular, when targets on the earth, position critically important.If properties of vary according to vectorial tensorial situations, we require both azimuths vector attitude space.In this article, address meaning position, azimuth geoscience, geoengineering geotechnology, how measure utilize them.