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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
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Journal of the Korean earth science society
Journal Basic Information
Journal DOI :
The Korean Earth Science Society
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Volume & Issues
Volume 30, Issue 7 - Dec 2009
Volume 30, Issue 6 - Oct 2009
Volume 30, Issue 5 - Sep 2009
Volume 30, Issue 4 - Aug 2009
Volume 30, Issue 3 - Jun 2009
Volume 30, Issue 2 - Apr 2009
Volume 30, Issue 1 - Feb 2009
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Geophysical Well-log Analysis of Andesite and Sedimentary Rocks in Myodo-dong, Yeosu, Southern Korea
Leem, Kook-Mook ; Park, Jong-Oh ; Yu, Young-Chul ; Song, Moo-Young ;
Journal of the Korean earth science society, volume 30, issue 4, 2009, Pages 401~408
DOI : 10.5467/JKESS.2009.30.4.401
We carried out the Suspension PS log and gamma-gamma log in andesite and sedimentary rocks distributed near the area of Myodo-dong, Yeosu. The main purpose of this study was to find out the distribution of seismic velocities and densities and to analyze the correlation of the two rocks by comparing their geophysical well logs with rock cores. The distributions of P and S-wave velocities for two rocks represented in the study area showed a difference of about 2,000 m/sec and 1,500 m/sec with depth, respectively, while the distributions of densities had a discrepancy of about
with depth. However, the results of geophysical well logs analysis were similar to the two rocks. Consequently, it is clear that these results are interpreted as a difference due to weathering rather than rock type. In particular, the RQD values showed a good correlation to geophysical well log data.
Vertical Variations of Benthic Foraminiferal Assemblages in Core Sediments on Yeoja Bay, Southern Coast of Korea: Implications for Late Holocene Sea-Level Change
Jang, Seok-Hoon ; Jeong, Da-Un ; Lee, Yeon-Gyu ;
Journal of the Korean earth science society, volume 30, issue 4, 2009, Pages 409~426
DOI : 10.5467/JKESS.2009.30.4.409
In the four sedimentary cores from Yeoja Bay, the analyses of grain size, benthic foraminiferal species compositions, assemblages and statistics were carried out to investigate the effects of late Holocene sea-level change on benthic foraminifera. The core sediments were mainly composed of fine-grained silt and clay. The benthic foraminifera were classified into 27 species of 16 genera, 30 species of 21 genera, 50 species of 29 genera and 52 species of 29 genera in Core YC-1 to 4, respectively. In the result of cluster analysis, it seemed that Group 1 (Core YC-1 and 2) of representative A. beccarii assemblages was deposited in upper bay environment and Group 2 (Core YC-3 and 4) of representative E. clavatum-A. beccarii assemblages was deposited in inner bay environment affected by offshore water. In the result of species composition analysis, the production frequency of A. beccarii was gradually decreased from low layer to upper layer, whereas production frequency of E. clavatum and P.F./T.F. was gradually increased to upward. These change patterns appeared in benthic and planktonic foraminifera seemed to reflect the late Holocene sea-level rise in Yeoja Bay.
Geochemistry and Petrogenesis of Adakitic Granitoids from Bognae Area in the Southwestern Part of the Yeongnam Massif, Korea
Wee, Soo-Meen ; Park, Jae-Yong ;
Journal of the Korean earth science society, volume 30, issue 4, 2009, Pages 427~443
DOI : 10.5467/JKESS.2009.30.4.427
Cretaceous intrusive and extrusive rocks in the southwestern part of the Yeongnam Massif are possibly the result of intensive magmatism which occurred in response to subduction of the Pacific plate beneath the northeast portion of the Eurasian plate. Geochemical and petrological study on the granitic rocks were carried out in order to constrain the petrogenesis of the granitic magma and to establish the paleotectonic environment of the area. Whole rock chemical data of the granitic rocks from the study area indicate that all the rocks have characteristics of calc-alkaline series in the subalkaline field. The overall geochemical features show systematic variations in each granitic body, but the source materials of each granitic body are thought to have been different in their chemical composition. The granodiorites distributed around Donggyori in the Bognae area (DGd) are different from other granitic rocks within the study area in the contents and differentiation trends of
and MgO as well as in the contents of the trace elements such as Ba, Sr, Pb, Ni, Cr and Y DGd have geochemical features similar to slab-derived adakites such as high
, Sr contents and high Sr/Y, La/Yb ratios, but low Y and Yb contents. The major and trace element contents of the DGd fall well within the adakitic field, whereas other Cretaceous granites in the study area are plotted in the island arc ADR area in Sr/Y vs. Y diagram. On the ANK vs. A/CNK and tectonic discrimination diagrams, parental magma type of the granites corresponds to I-type and volcanic arc granite (VAG). Interpretations of the chemical characteristics of the granitic rocks favor their emplacement in a compressional tectonic regime at continental margin during the subduction of Pacific plate. The geochemical and tectonic features reveal that adakite-like signatures of the DGd were generated by the interaction of mantle peridotite and subducted slab-derived adakitic melts (caused by the thermal effect of ridge subduction), and which slightly modified by crustal contamination during emplacement.
Conifer Fossils from the Lower Cretaceous Youngdong Group and Their Paleoclimatic Implication
Seo, Ji-Hye ; Kim, Jong-Heon ;
Journal of the Korean earth science society, volume 30, issue 4, 2009, Pages 444~453
DOI : 10.5467/JKESS.2009.30.4.444
A large number of fossil plants were collected from the Lower Cretaceous Youngdong Group in the Youngdong area of Chungcheongbug-do, Korea. Youngdong flora consists of 5 genera and 6 species, such as Frenelopsis cf. alata, Pseudofrenelopsis cf. parceramosa, P. cf. varians, Brachyphyllum cf. vulgare, Pagiophyllum sp., and Classostrobus sp., including the male and female cones of Pseudofrenelopsis first occurred in the study area. All of them belong to conifers of Cheirolepidiaceae. It is presumed that Youngdong flora might have flourished under the arid subtropical climate during the middle-late Early Cretaceous.
Observation, Experiment, and Analysis of the Ice Spikes Formation
Yoon, Ma-Byong ; Kim, Hee-Soo ; Son, Jeong-Ho ; Yang, Jeong-Woo ;
Journal of the Korean earth science society, volume 30, issue 4, 2009, Pages 454~463
DOI : 10.5467/JKESS.2009.30.4.454
In this study, from January 2006 to February 2009, we observed 107 ice spikes formed in a natural state, and analyzed their environment. We developed an experimental device to reproduce ice spikes in laboratory and successfully made 531 ice spikes. We analyzed the process of the formation and the principle of how those ice spikes grow through videotaped data of the formation in the experiment. In the natural world, when the surface of water and the lower part of a vessel begin to freeze, a vent (breathing hole) develops at the surface where an ice is not frozen; this vent serves as the seed of an ice spike. It is assumed that the volume expansion of ice in the vessel which occurs when water freezes makes the supercooled water go upward through the vent and becomes an ice bar called an ice spike. In the laboratory, however, when distilled water is poured into an ice tray cube and kept in the experimental device for about one and a half hours at a temperature of -12-
, a thin layer of ice then begins to develop on the surface of the water, the vent is formed, and ice spikes form for about 10-30 minutes. These spikes stop growing when the end becomes clogged. Ice spikes can be described as falling into seven categories of shape, with the apex type topping the list followed by the slant type in the natural state and the vertical type predominating in the laboratory.
Numerical Simulation of Local Circulation Over the Daechung Lake Area by Using the Mesoscale Model
Byon, Jae-Young ; Choi, Young-Jean ; Seo, Beom-Keun ;
Journal of the Korean earth science society, volume 30, issue 4, 2009, Pages 464~477
DOI : 10.5467/JKESS.2009.30.4.464
In this study, we examined the patterns of local circulation over the Daechung lake area through the numerical experiment designed to investigate the impact of lake on the local circulation. The results of numerical experiment showed that the surface temperature predicted by WRF model was lower than the observation, while the wind speed was stronger than the observation. The local circulation over the lake area was characterized by a lake breeze induced by a horizontal thermal contrast between the lake surface and the Surrounding land. At Daecheong Lake, a lake breeze formed at 09 LST and dissipated at 18 LST, with maximum intensity at 15 LST. The vertical extent of the simulated circulation was about 1,200 m. The specific humidity increased as the humid air above the lake moved landward due to the daytime circulation of the lake breeze. The numerical experiments of sensitivity to existence of the lake showed that the simulated surface temperature decreased in the experiment with the lake. Wind speed was more intense around the lake area when the actual land use was substituted by grassland land use. The results of numerical experiments suggest that the lake-induced lake breeze circulation has an effect on the meteorology of planetary boundary layer around the lake.
Development of a Web Page for Real-time Meteorological Observation Data Service Using AWS
Kim, Yong-Nam ; Seong, Gi-Hong ; Hong, Jeong-Hee ; Kang, Dong-Il ;
Journal of the Korean earth science society, volume 30, issue 4, 2009, Pages 478~484
DOI : 10.5467/JKESS.2009.30.4.478
A web page was developed to enhance students' learning experience in studying meteorological phenomena. After collecting the meteorological elements observed with automatic weather observation system (AWS), it serve real-time meteorological information on demand. Past meteorological information as well as real-time current information can be retrieved because the web page can save and accumulate observed information in its data base. The completed web page was successfully applied in school settings in teaching students meteorology research sections of earth science. The results show that students experienced authentic and meaningful learning through the real-time meteorological information from the web page. In addition, large scale of time was required to observe meteorological phenomena and it hindered practical meteorological research in earth science classes. However, it is expected that the time limitation can be overcome by utilizing accumulated meteorological information of the web page.
Patterns of Astronomical Seeing at KSA SEM Observatory
Kang, Im-Seok ; Lee, Kyung-Hoon ;
Journal of the Korean earth science society, volume 30, issue 4, 2009, Pages 485~494
DOI : 10.5467/JKESS.2009.30.4.485
We report patterns of astronomical seeing at KSA SEMO (Korea Science Academy Space Earth and Man Observatory). Though the data of the seeing measured at the local observatory is essential in identifying the seeing of the observatory, systematic measurement of seeing has not been made in Pusan yet. For this reason, KSA SEMO adopted the Santa Barbara Instrument Group (SBIG) Seeing Monitor to constantly record the seeing. The seeing monitoring was done through an elaborate procedure involving direct CCD images in the focal plane which were subsequently analyzed for the full width at half maximum (FWHM) Gaussian widths. Based on the seeing monitoring for 8 months, we classified five patterns of the seeing at KSA SEMO: 'Sunset/Sunrise Effect', 'Extreme Fluctuation', 'Sudden Increment', 'Daily Variation' and 'Stable Condition'. Seeing was generally good from 1:00 am to 3:00 am than other times, and it was also better in Winter than in Summer.
Parent's Role in Rearing Gifted Children: Case of Mothers of Gifted Children in Korea Science Gifted Academy
Shim, Eun-Young ; Kim, So-Mee ; Choe, Seung-Urn ;
Journal of the Korean earth science society, volume 30, issue 4, 2009, Pages 495~512
DOI : 10.5467/JKESS.2009.30.4.495
We arranged and classified rearing patterns of gifted children's parents in order to find out mothers' roles for their gifted children. We developed a frame of parents' role to analyze the rearing cases of nine mothers whose children currently attend the Korea Science Gifted Academy. We surveyed and conducted semi-structured interviews with nine mothers to collecting qualitative data and were able to find out their roles that were classified into 4 distinctive roles: Instructor, Supporter, Dialogist and Moral Discipliner. Findings indicated that there was no significant difference between the roles found from parents' interview and the ones found from literature review. However, it is noticed that Korean mothers not only played a role for connecting their children's human networks but also did the role for controling the natural process of learning Korean characters and words with siblings as well as parents before school age.
Analyses of Salinity Unit in the Secondary School Science Textbook and Suggestion for Its Correction
Park, Kyung-Ae ; Choi, Ji-Young ;
Journal of the Korean earth science society, volume 30, issue 4, 2009, Pages 513~526
DOI : 10.5467/JKESS.2009.30.4.513
It has long been that the unit of oceanic salinity changed from permil (%o) to other unit. However, the middle-and high- school textbooks of science and earth science have still used %o as salinity unit that was defined a long time ago. The objectives of this study are to briefly discuss about the historical development of change in salinity unit and measurement techniques, to present differences between the salinity units of psu (practical salinity unit) and %o, and to address the need and validity for the correction of salinity unit in the textbooks. Twenty-seven kinds of textbooks based on the 7th National Curriculum were analyzed to investigate the expression of salinity unit and the definition of salinity. The results were compared with the usage of salinity units in the articles published in Journal of Korean Society of Oceanography from 1967 to 2008. The percentages by the use of %o were 96.3% in the text and 83.8% in the graphs or tables of the textbooks. By contrast, the scientific papers began to use psu from 1994 and then %o has seldom been used since 2004.