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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
Editor in Chief :
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
Selecting the target year
Survey of Borate deposit in Northern Argentina: Salinas Grandes Borate deposit
Pak, Sang-Joon ; Lee, Han-Yeang ;
Journal of the Korean earth science society, volume 30, issue 7, 2009, Pages 801~809
DOI : 10.5467/JKESS.2009.30.7.801
The Salinas Grandes borate deposit located in Jujuy state, northern Argentina can be categorized into the playatype evaporite deposit. Major borate mineral is ulexite (
), which boron could be originated from volcanic rocks nearby playa. The eastern part of the Jujuy state in northern Argentina belongs to the Altiplano-Puna platform which shows high altitude and semiarid climate. Lots of Mesozoic and Cenozoic volcanics that are source of boron as well as playas that are the basin for borate precipitation in the area are essential for boron evaporite deposit. Therefore, the extensive explorations for the playa-type evaporite deposit are need.
Characteristics of Site Amplification of the Broad-band Seismic Stations in Korea
Kim, Seo-Young ; Kim, Sung-Kyun ;
Journal of the Korean earth science society, volume 30, issue 7, 2009, Pages 810~823
DOI : 10.5467/JKESS.2009.30.7.810
One of the critical factors in accurate determination of earthquake source parameters, and in prediction of seismic hazards is the detailed information related to the site amplification characteristics. The site amplification characteristics of the broad-band seismic stations in Korea were estimated as a function of frequency in the range of 0.2 to 20 Hz. A total of 1275 seismograms recorded from 43 earthquakes observed from 2003 to 2008 in the southern Korean Peninsula were used. It was found that the site amplification ratios for 28 stations estimated from the inversion of the ground motion model were approximately concordant with those obtained from the horizontal-to-vertical (H/V) spectral ratio except for some stations. The spectral site amplification characteristics obtained in this study did not show any considerable spatial distribution. It revealed to be largely correlated with the degree of weathering rather than the basement rock type. Considering the spectral site amplification ratio, 28 broad-band stations were classified into four groups and the characteristics of each group were described in the text.
A Study on Temporal Variations of Geomagnetic Transfer Functions and Polarization Values Obtained at Cheongyang Geomagnetic Observatory
Yang, Jun-Mo ; Lee, Heui-Soon ; Oh, Seok-Hoon ;
Journal of the Korean earth science society, volume 30, issue 7, 2009, Pages 824~833
DOI : 10.5467/JKESS.2009.30.7.824
We analyzed a total of six months of geomagnetic data obtained at Cheonyang observatory, which is operated by Korean Meteorological Administration, to monitor earthquake precursors. Geomagnetic transfer functions (GTFs) and polarization values, which reflect the time-variations of the resistivity of subsurface, were estimated from 3-component geomagnetic data. The time-variant fluctuations were compared with the earthquake events occurred in the same period. Now that the daily GTFs show fairly irregular variations, we can not identify any correlation with the already occurred earthquakes and Kp index. On the other hand, we detect clear increases of the Ultra-Low-Frequency (ULF) band polarization values before the earthquakes, but the similar features are also observed even though the earthquake did not occur. This result may indicate that these time-variations are not just due to the earthquake precursor. For further understanding about these results, we need to investigate the relationship between the previous earthquake events and the geomagnetic data of other observatories.
An Application of Minimum Support Stabilizer as a Model Constraint in Magnetotelluric 2D Inversion
Lee, Seong-Kon ;
Journal of the Korean earth science society, volume 30, issue 7, 2009, Pages 834~844
DOI : 10.5467/JKESS.2009.30.7.834
Two-dimensional magnetotelluric (MT) inversion algorithm using minimum support (MS) stabilizer functional was implemented in this study to enhance the contrast of inverted images. For this implementation, this study derived a formula in discrete form for creeping model updates in the least-squares linearized inversion. A spatially varying regularization parameter determination algorithm, which is known as ACB (Active Constraint Balancing), was also adopted to stabilize the inversion process when using MS stabilizer as a model constraint. Inversion experiments for a simple isolated body model show well the feature of MS stabilizer in concentrating the anomalous body compared with the second-order derivative model constraint. This study also compared MS stabilizer and the second-order derivative model constraints for a model having multiple anomalous bodies to show the applicability of the algorithm into field data.
A 30-year Average Wind Map in North Korea
Seo, Eun-Kyoung ; Yun, Jun-Hee ; Park, Young-San ;
Journal of the Korean earth science society, volume 30, issue 7, 2009, Pages 845~854
DOI : 10.5467/JKESS.2009.30.7.845
To examine the wind energy potential of North Korea, climatological wind map was constructed using the 30-year hourly observations of wind speed and direction at 27 meteorological stations. This examination was based on the Weibull model, which represents the probability density distribution of wind speed. It was found that overall, high terrain(Geama Gowon) in the central-northern part and south-west coast (Hwanghae-do) of North Korea have the annual average wind speed which exceeds 4 m/s at 50 m altitude above ground. The wind speed >5 m/s is more persistent in spring, but less in summer. Amongst the meteorological stations, Changjin and Yangdok show the most persistent wind speed in time and strength.
Earth Science Teachers` Conceptual Types about Image Formation through a Telescope
Lee, Seok-Woo ; Yim, In-Sung ; Choe, Sung-Urn ;
Journal of the Korean earth science society, volume 30, issue 7, 2009, Pages 855~868
DOI : 10.5467/JKESS.2009.30.7.855
The purpose of this study was to investigate how teachers understand the principle of image formation of stars through a telescope. This study was conducted by using explanatory paper questionnaires given to 101 earth science teachers in the areas of Gyunggi province and Seoul. The questionnaires were cross-analyzed by three experts in earth science education. Result indicated that most of the participating teachers did not have systematic concepts about the process of making an image formed by a convex lens. Particulary, they did not sufficiently understand the concepts of an image and the functions of a screen. Furthermore, only 3% of the participants possessed the scientific concepts about the image formation principle of a star through the telescope. Most of the teachers seem to have non-scientific or alternative concepts about the image formation, which was only understanded with the fragmented characteristics about light and convex lens.
The Responses of Elementary Teachers and the Development of Teaching Materials for Geological Fieldwork in the Area of Mai Mountain
Noh, Beyong-Seob ; Ryang, Woo-Hun ; Cho, Kyu-Seong ;
Journal of the Korean earth science society, volume 30, issue 7, 2009, Pages 869~882
DOI : 10.5467/JKESS.2009.30.7.869
The purpose of this study is to develop teaching materials for geological fieldwork around the area of Mai Mountain and to analyze the responses of elementary teachers as to the application of fieldwork. The site of geological fieldwork, Mai Mountain area, is located around the Maisan Provincial Park of Jinan-gun, Jeonbuk Province where a large-scale sedimentary succession in the era of Cretaceous is shown. It provides an easy access to distinct outcrops around the provincial park. The sequences reveal different kinds of sedimentary rocks and various sedimentary structures, and provide information of the lacustrine sedimentary environments of the Cretaceous. In addition, metamorphic rocks and structures formed at the margin of the basement and the basinal fault as well as a sedimentary sequence of the Quaternary formed in a modern fluvial stream are observable. A 4-step fieldwork procedure was applied to a group of 13 elementary teachers. Through questionnaire and interview, results showed that (a) the geological fieldwork and materials were effective to positively increase science teaching from the participating teachers, and that (b) there is a great need of the development of various fieldwork sites and teaching materials that promote active fieldwork for students to have their lived experience and knowledge gain. It is suggested that teacher education programs be able to provide active fieldwork for elementary inservice teachers to properly carry out a geological fieldwork for their students.
Development and Application of Teaching Materials for Geological Fieldwork in the Area of Bongwhabong, Buan-gun, Jeonbuk, Korea
Park, Jae-Moon ; Ryang, Woo-Hun ; Cho, Kyu-Seong ; Kim, Seung-Bum ;
Journal of the Korean earth science society, volume 30, issue 7, 2009, Pages 883~896
DOI : 10.5467/JKESS.2009.30.7.883
This study is to develop teaching materials for geological fieldwork around Bonghwabong area in the national park of the Byeonsan Peninsula, Buangun, Jeonbuk. The developed materials are applied in the geological fieldwork of science high school students to maximize the effects of use. The sedimentary succession of the Bonghwabong area in the Cretaceous age, Mesozoic, represents large-scale and distinctive sedimentary structures on the sea cliffs, which are utilized as teaching materials for earth science fieldwork. The area of Bonghwabong also comprises various geological structures related to advanced learning programs as well as those within the curriculum of high school earth science. A five-step fieldwork model was applied to 15 students in clubs related to earth science in a science high school. This study used a qualitative methodology to analyze students` responses that were gathered about the process of fieldwork. During the activity, a qualitative analysis was carried out by using discussions and interviews both with the students and the teacher. Results indicated that the fieldwork activity using teaching materials was effective in helping the students improve their self-directed learning and practical understanding of earth science.
Analysis of the Type, Function, and Structure of Inscriptions in Middle School Science Textbooks: Focus on Earth Science Content of the 7th National Curriculum
Lee, Ki-Young ;
Journal of the Korean earth science society, volume 30, issue 7, 2009, Pages 897~908
DOI : 10.5467/JKESS.2009.30.7.897
Inscriptions are integral parts of the current science textbooks, and become medium that makes sense of scientific concepts effectively. This study analyzed the inscriptions from five science textbooks at the secondary level in terms of its type, function, and structures. Analyzing types of inscriptions resulted that the ratio of frequently used photographs and illustrations were much higher than that of graphs and tables used. In case of function analysis, illustrative and complementary functions were dominant in terms of frequency and ratio, whereas explanatory, decorative and inquisitive functions were relatively rare. Inscriptions of single structure was much more than multiple structure. Multiple structure of pair and series were mainly used for representing contrast and sequence, respectively. The proportion of inscriptions in type, function and structure across the textbooks was significantly different. Based on the results, it was suggested that semiotic study about the function and the structure of inscriptions need to be carried out in earth science area to better understand the pedagogical implications of inscriptions in school science.
Interaction Patterns in Dialogic Inquiry of Middle School Students in Small Groups in the Natural History Gallery
Jung, Won-Young ; Lee, Joo-Youn ; Park, Eun-Ji ; Kim, Chan-Jong ; Lee, Sun-Kyung ;
Journal of the Korean earth science society, volume 30, issue 7, 2009, Pages 909~927
DOI : 10.5467/JKESS.2009.30.7.909
Inquiry became an essential methodology in science education. Recently, argumentation becomes more important in inquiry, but inquiry-based teaching in school science would not provide enough opportunities for students to have voluntary and active interactions during inquiry activities. Informal science learning can be an alternative for authentic inquiry. Accordingly, this study aims to find interaction patterns in dialogic inquiry of junior high school students in small groups in the natural history gallery. Inquiry elements and interaction patterns are analyzed with 42 dialogues of 13 small groups. As a result, seven interaction patterns are identified. First, five major interaction patterns were drawn as follows; Sharing questions, asking questions and simple response, asking questions and simple explanation, asking questions-simple explanation-(collecting data)-data based explanation, and asking questions-collecting data-data based explanation. Second, pattern 2, `asking questions and simple response`, is subdivided into three categories; passive and/or evasive response, inaccurate response, and repeated patterns of asking questions-simple response. The results of the study provide different patterns of dialogic interactions in a small group inquiry in informal contexts from formal contexts, and provide foundations to understand middle school students` interactive dialogues of inquiry occurred in the natural history gallery.
Introduction of Major Ore Deposits and mining Projects in Argentina
Lee, Han-Yeang ;
Journal of the Korean earth science society, volume 30, issue 7, 2009, Pages 921~925
DOI : 10.5467/JKESS.2009.30.7.921
It is introduced briefly to understand the overall state of mineral resources of Argentina profile of 30 major ore deposits and mining projects. Prospecting deposits are mostly concentrated on the Northwestern and Midwestern area in Argentina and this fact implies that deposit formation is strongly related to Andean Orogeny. Argentina is important mineral exporting country for copper, gold, silver, lead, zinc, lithium and boron. For a long-term strategy of fuel energy and mineral supply active cooperation of geological research and mine business between Korea and Argentina is needed.