| 摘要(英) |
The resistivity image profiling methed is were used to investigate the feature of the electric resistivity structures ane the subsurface structure of southern segment of the Chelungpu fault. Several conclusions can be drawn as follows：(1)According to the geoelectric characteristic of the formations was able to paragraph of the Chinshi south on the 921 earthquake fault. Northern segment was Chelungpu fault. Southern segmernt was starting point of Dajianshan fault.(2)Detritus of foothill has a thickness of about 15 meters and a resistivity of about 40-60 Ω．m in the surface of Jennshing area. Resistivity of Chinshui Shale is about 10-60 Ω．m. Resistivity of Gravel formation of footwall is about 100-600 Ω．m. Chinshui Shale does not have uniform contact within its Gravel formations. The fault dips eastward at an angle of about 60-70 degrees. (3)Gravel formation thickness is about 10-20 meters and resistivity is about 100-5000 Ω．m in surface of Jwoshoei, Shoeidiliau and Taliuen area. Resistivity of Chinshi Shale is about 5-60 Ω．m. Gravel formation of the footwall near the fault has thickened due to pressure and its resistivity is 100-2400 Ω．m. Deeper into the formation, the gravel turns oozy and the resistivity is 10-300. The fault dips eastward at an angle of about 40-80 degrees.(4)Waipuzi area thickness is about 2-5 meters of non-continuous gravel formation, Resistivity is 100-1000 Ω．m. Resistivity of chinshi shale is about 5-60. Resistivity of Gravel formation at footwall is 100-300 Ω．m. This fault zone appears at Dongpuna river part of it is growing.(5)Gravel formation thickness is about 5-20 meters and resistivity is about 80-800 Ω．m in surface of Chushan area. Chinshui shale is about 40-60 Ω．m. Resistivity of Gravel formation at footwall is 100-2000 Ω．m. The fault dips eastward at an angle of about 60-80 degrees.(6)The area depth 60m or higher is terrace deposit of Chaofeng, resistivity is about 100-800 Ω．m. Below 60m depths is cholan formation, resistivity is about 10-80 Ω．m. The two areas are unconformity contact. The measurable line J-J’. Horizontal line between 32m and 88m are terraces. Used to be a fault zone. The fault apparent dips eastward at an angle of about 60-70 degrees. (7)Gravel formation thickness is about 5-15 meters terrace deposits and resistivity is about 100-2000 Ω．m in surface of Linding area. Below is kueichulin formation, resistivity is 5-60 Ω．m. The fault dips eastward at an angle of about 40-70 degrees. |
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