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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
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The Journal of Engineering Geology
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Journal DOI :
The Korea Society of Engineering Gelolgy
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Volume & Issues
Volume 2, Issue 2 - Oct 1992
Volume 2, Issue 1 - May 1992
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Frture mapping and deep-seated ground water exploration in the crystalline rocks by integrated geophysical techniques
The Journal of Engineering Geology, volume 2, issue 2, 1992, Pages 113~130
Groundwater in crystalline basement is controlled primarily by tectonic fractures. It is evident that the delineation of the heavily faulted area and/or fractures deeply developped should be considerable value in deep-seated low enthalphy geothermal water. Electrical and electromagnetic methods have effectively been employed to map hydraulic faults and shear zones for groundwater exploration. In this study VLi; dipoledipole resistivity, controlled source audio~frequency magneto-telluric(CSAMT) and magnetic methods were applied in the Bomun resort area, adjacent to Kyongju city, southeastern part of Korea. The integrated geophysical tools employed in this experiment can be manifested themselves as: 1. Magnetic high for granite intrusions which is more favorable for geothermal gradient increase in depth. 2. VLF cross-over trends for mapping linear shallow conductive fractures and shear zones. 3. Dipole-dipole resistivity distributions for the deep-seated(less than 500m in depth) fractures and shear zones. The dipole-dipole resistivity field data were inverted to the true resistivity distribution with two-dimensional automatic inversion program based on the finite-difference method. 4. CSAMT provides an efficient way of delineating fractures and fault zones if the depth is greater than about 500m.
GIS technolgy for analysing regional geologic hazards (Landslides)
The Journal of Engineering Geology, volume 2, issue 2, 1992, Pages 131~140
GIS(Geographic Information System) technology was applied for analysis of the potential degree of regional geologic hazard, especially landslide hazards in the suburb of Seoul City, whereby a regional geologic hazard map was produced. The factors causing a landslide such as slope geometry, geology, groundwater, soil property, rainfall and vegetation were incorporated through GIS in order to predict the potential hazards in this area. Cartographic simulation was finally made with these factors to produce a regional geologic hazard map. For this study, ARC/INFO and ERDAS systems were used in SUN 4-390 workstation.
Digital image processing for digital elevation model data
The Journal of Engineering Geology, volume 2, issue 2, 1992, Pages 141~146
Synthetic stereo-pair of Landsat TM(Thematic Mapper) and shaded relief image from DEM(Digital Elevation Model) were digitally produced. They are very useful in optimizing the geological interpretability of the remotely sensed data.
Monte-Carlo simulation of earthquake sequence in the time and magnitude space
The Journal of Engineering Geology, volume 2, issue 2, 1992, Pages 147~154
A computer simulation of earthquake sequence in the time and magnitude space was done using random number generation. The theory of the simulation are based on the two statistical models of earthquake events. Those models are Stationary Poisson Process for independent earthquakes and Branching Markov Process for aftershocks. The generated earthquake sequnces resemble the actual earthquake catalogs.
A study of Kem County earthquake
The Journal of Engineering Geology, volume 2, issue 2, 1992, Pages 155~165
The purpose of this study is to evaluate compatability of seismic source characteristics of the Kern County earthquake to those of Korean Peninsula seismotectonics. The compatability could be used to make Korean type response spectrum from the strong ground motions observed from the assingned earthquake. The July 21, 1952, Kern County, California, earthquake is the largest earthquake to occur in the western U.S. since 1906, and the repeat of this event poses a significant seismic hazard. The Kern County event was a complex thrusting event, with a surface rupture pattern that varied from pure leftlateral strike-slip to pure dip-slip. A time dependent moment tensor inversion was applied to ten observed teleseismic long-period body waves to investigate the source complexity. Since a conventional moment tensor inversion(constant geometry through time) returns a non-double-couple source when the seismic source changes(fault orientation and direction of slip) with time, we are required to use the time dependent moment tensor which allows a first-order mapping of the geometric and temporal complexity. From the moment tensor inversion, a two-point seismic source model with significant overlap for the White Wolf fault, which propagates upward(20 km to 5 km) from SW to NE, fits most of the observed seismic waveforms in the least squares sense. Comparison of P, T and B axes of focal mechanisms and focal depths suggests that seismic source characteristics of the Kern County earthquake is consistant with those of Korean Peninsula Seismotectonics.
Relative relocation of Tadzhi kistan-Sin kiang events
The Journal of Engineering Geology, volume 2, issue 2, 1992, Pages 166~172
Sixty Tadzhikistan-Sinkiang events occurred from the year 1966 to 1978 were relocated using relative location method with one reference event technique. Since the area covered by the events is about
, the region is subdivided into four. Each one has one reference event with accurate hypocenter location and travel time. The result shows average 0.3 change of distance.
A geochemical study on the metal contamination of groundwater in Taegu City
The Journal of Engineering Geology, volume 2, issue 2, 1992, Pages 173~200
The quality of groundwater in the central part of Taegu City is influenced by upstreams of Sin-stream and Beomeo-stream because the stream waters are main source of the groundwater, and chemical composition of the upstream waters has close relationship with andesite and monzonite in the igneous rock terrain. The pH of upstreams are weak acid ~ neutral in the igneous rock area and weak alkaline in the sedimentary rock area. Contents of
in the streams are apparently high, and
content is only slightly high in the sedimentary rock area. But
content is lower in the Panyaweol formation area than in the monzonite area. The contents of heavy metals and
are also higher in the sedimentary rock area of residential sections and industrial complexes than those in the igneous rock area. The groundwater is contaminated in comparison to the upstream water of the igneous rock areas, and there are some differences in pollution level between the Panyaweol formation area of residential sections and the Haman formation area of industrial complexes. K, Na, Ca, Mg, Cl,
contents in the Haman formation area are relatively higher than those in the Panyaweol formation area. But pH is nearly equal in the two areas. The content of heavy metal ions is still lower than the drinking water standard of Korea and only slightly differs in the two sedimentary rock areas. But the groundwater in the Haman formation area is considerably contaminated by Kongdanstream and Dalseo-stream.
The new hatch patterns fbr drawings in geotechnical engineering
The Journal of Engineering Geology, volume 2, issue 2, 1992, Pages 201~211
The various hatch patterns supplied by CAD systems are not sufficient for the preparation of geotechnical map and their use can often mislead to a wrong map interpretation. To use, edit, and communicate the geotechnical map information with ease among many CAD user, unified drawing file format is suggested. New hatch patterns are designed and suggested to use with geotechincal jobs.
Abstract of papers presented at the second annual society meeting
The Journal of Engineering Geology, volume 2, issue 2, 1992, Pages 213~220