HR: 0804h
AN: NS11E-0828    [Abstracts]
TI: Imaging the Active Faults in Lanzhou, Northwest China
AU: * Lu, Y
EM: yuxiall@hotmail.com
AF: Lanzhou Base of Institute of Earthquake Prediction,CEA, 450 Donggangxilu Street, Lanzhou, GS 730000, China
AU: * Lu, Y
EM: yuxiall@hotmail.com
AF: Lanzhou Institute of Seismology, CEA, 450 Donggangxilu Street, Lanzhou, GS 730000, China
AU: * Lu, Y
EM: yuxiall@hotmail.com
AF: Kentucky Geological Survey, 228 Mining and Mineral Resources Building, Lexington, KY 40506, United States
AU: Woolery, E W
EM: ewoolery@uky.edu
AF: Department of Earth and Environmental Sciences, University of Kentucky, 101 Slone Building, Lexington, KY 40506, United States
AU: Wang, Z
EM: zmwang@email.uky.edu
AF: Kentucky Geological Survey, 228 Mining and Mineral Resources Building, Lexington, KY 40506, United States
AB: Although earthquake is difficult to predict, hazards generated by the earthquake can be assessed and certain mitigation measures can be taken accordingly. For example, a better planning and design for buildings can be taken to reduce potential damage caused by earthquake. Earthquakes, particularly those strong or large ones that are of safety concern, are generally associated with active faults. Therefore, determination and characterization of active fault is one of the key elements in seismic hazard assessment. Buildings and infrastructures can be sited away from the active faults. An early warning system of an eminent earthquake may be installed, and post-earthquake relief can also be planned if the active faults are known. Therefore, detecting the active faults in a populated city is of great significance. City of Lanzhou, located on the northeastern edge of Qinghai-Tibet plateau where neo-tectonic deformation is high, is the capital city of Gansu Province, and experienced many earthquakes; the largest one is M7.0 in 1125. This is the reason that Lanzhou was selected by the Chinese Central and Gansu Provincial Governments for conducting a comprehensive project to assess seismic hazard and to formulate mitigation measures in the urban area. One of key components of the project is to image active faults in and around Lanzhou. Shallow high-resolution seismic methods are considered as the most effective and reliable method for detecting the subsurface deformation, particularly in Lanzhou due to the unique seismological and geological conditions. Seismic reflection and refraction profiles across several active faults, especially the Jinchengguan fault and the Liujiapu projected fault, were collected in Lanzhou. In conjunction with other geophysical investigations such as electrical, magnetic, gravity surveys, seismic investigations confirm the Jinchengguan active fault and suggest that Liujiapu projected fault may not be an active one. The seismic investigations will help to assess potential surface offsets of the active faults in Lanzhou.
DE: 0900 EXPLORATION GEOPHYSICS
DE: 0935 Seismic methods (3025, 7294)
DE: 7221 Paleoseismology (8036)
DE: 7230 Seismicity and tectonics (1207, 1217, 1240, 1242)
DE: 7250 Transform faults
SC: Near-Surface Geophysics [NS]
MN: 2007 Fall Meeting