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柳忠烈,梁慶嬉,李相遠,金仁洙 釜山大學校 師範大學 1996 교사교육연구 Vol.33 No.-
Tectonic investigation is very important to understand the seismic environments. Many strong seismic activities are found to be closely related with pre-existed discontinuous planes of the crust, such as faults. Here we describe an example of the Quaternary faults occurring in the vicinity of the Ulsan fault near Ipshil-ri, Oedong-up, Ky o ∨ ngju city to enlight a seismic activity evaluation. This fault is thought to be the contact boundary between the Cretaceous to early Tertiary granite and andesite, and also cut the Quaternary formation which unconformably overlies granite and andesite. General strike of the fault plane is N-S, dipping 70° to the east. Along this fault plane, two different faulting events are distinguished; (1) reverse faulting with up to 5m of displacement in the Quaternary formation, and (2) normal faulting with 50° northerly plunging striation within the Quatenary fault plane. We suggest that these faultings are related to the WNW-ENE compressional tectonic environments during late Quaternary, and to the readjustment of accumulated strains by the pre-compressional tectonic environments. The age of the Quaternary formation is not fully investigated, however, this Quaternary fault is probably one of the active faults which has been rarely described in Korea.