Seven samples of loess and paleosol collected from the major stratigraphic boundaries of the strata of the Weinan section, Shaanxi Province, are dated using the fine-grained TL technique.Based on the TL results and pr...Seven samples of loess and paleosol collected from the major stratigraphic boundaries of the strata of the Weinan section, Shaanxi Province, are dated using the fine-grained TL technique.Based on the TL results and previously ages-published from this section, the polynomial fitting methods are applied to the development of the high resolution time scale for the Weinan loess section in the late Quaternary. According to this time scale, the ages of S0/L1, L1-1/L1-2, L1-4/L1-5, L1/S1 and S1/L2 stratigraphic boundary of Weinan section are 1. 1, 2. 5, 5. 1,7. 6 and 12. 8 ka B. P., which, with exception of the maximum difference between the ages of L1-4/ L1-5 and the ages of 3/4 stage boundary of the deep-sea oxygen isotopes, are generally consistent with the ages of 1/2, 2/3, 4/5 and 5/6 stage boundary of the deep-sea oxygen isotopes in the SPECMAP curve.展开更多
For city planning and reducing potential earthquake risk,it’s necessary to detect the information of the buried faults in an urban area especially,including the location and activities.An integrated technique with ge...For city planning and reducing potential earthquake risk,it’s necessary to detect the information of the buried faults in an urban area especially,including the location and activities.An integrated technique with geophysical and geological methods,including the shallow seismic reflection profile,electrical resistivity measurement,geologic borehole section,and exploration trench,was used to detect the Chengnanhe fault,which is one of the two main faults passing through the Weihai urban area in Shandong province,China.The results show that it is a normal fault striking with E-W direction,and it is relatively inactive and stable.By using the thermoluminescence(TL)dating,we found that the Chengnanhe fault initiated in mid-Pleistocene and there was no offset after late Pleistocene.Such an integrated technique with multiple geological and geophysical methods provides a significant assessment of earthquake risk for city planning in urban areas.展开更多
文摘Seven samples of loess and paleosol collected from the major stratigraphic boundaries of the strata of the Weinan section, Shaanxi Province, are dated using the fine-grained TL technique.Based on the TL results and previously ages-published from this section, the polynomial fitting methods are applied to the development of the high resolution time scale for the Weinan loess section in the late Quaternary. According to this time scale, the ages of S0/L1, L1-1/L1-2, L1-4/L1-5, L1/S1 and S1/L2 stratigraphic boundary of Weinan section are 1. 1, 2. 5, 5. 1,7. 6 and 12. 8 ka B. P., which, with exception of the maximum difference between the ages of L1-4/ L1-5 and the ages of 3/4 stage boundary of the deep-sea oxygen isotopes, are generally consistent with the ages of 1/2, 2/3, 4/5 and 5/6 stage boundary of the deep-sea oxygen isotopes in the SPECMAP curve.
基金the Special Fund of China Seismic Experimental Site(Nos.2019CSES0103,2018CESE0102 and 2016CESE0203)the National Natural Science Foundation of China(Nos.41630210,41674060,41974054,and 41974061)the“Active Faults Exploration and Seismic Hazard Assessment in Weihai City”funded by Weihai Municipal People's Government.
文摘For city planning and reducing potential earthquake risk,it’s necessary to detect the information of the buried faults in an urban area especially,including the location and activities.An integrated technique with geophysical and geological methods,including the shallow seismic reflection profile,electrical resistivity measurement,geologic borehole section,and exploration trench,was used to detect the Chengnanhe fault,which is one of the two main faults passing through the Weihai urban area in Shandong province,China.The results show that it is a normal fault striking with E-W direction,and it is relatively inactive and stable.By using the thermoluminescence(TL)dating,we found that the Chengnanhe fault initiated in mid-Pleistocene and there was no offset after late Pleistocene.Such an integrated technique with multiple geological and geophysical methods provides a significant assessment of earthquake risk for city planning in urban areas.
