In the field investigations of the great 1976 Tangshan earthquake in China, several large subsidence areas with remarkable boundary fssures were reported as phenomena of the seismic event. Recently a re-interpretation...In the field investigations of the great 1976 Tangshan earthquake in China, several large subsidence areas with remarkable boundary fssures were reported as phenomena of the seismic event. Recently a re-interpretation of aerial photos taken immediately after the quake revealed that the areas were controlled by a giant fault of about 40 km in length; and subsidences were brought about by the movement of the fault during the shock, not being a consequence of soil liquefaction as suggested in some of the investigations. This discovery has been confirmed by the results of fine geophysical explorations carried out by the Jidong Oilfield Company, PetroChina. The newly discovered fault, named Fuzhuang-Xihe fault, is much longer than the one prevailingly accepted as the seismic fault of the Tangshan earthquake. Moreover, the former seems to be a normal fault, while the latter is regarded as a strike-slip one.展开更多
文摘In the field investigations of the great 1976 Tangshan earthquake in China, several large subsidence areas with remarkable boundary fssures were reported as phenomena of the seismic event. Recently a re-interpretation of aerial photos taken immediately after the quake revealed that the areas were controlled by a giant fault of about 40 km in length; and subsidences were brought about by the movement of the fault during the shock, not being a consequence of soil liquefaction as suggested in some of the investigations. This discovery has been confirmed by the results of fine geophysical explorations carried out by the Jidong Oilfield Company, PetroChina. The newly discovered fault, named Fuzhuang-Xihe fault, is much longer than the one prevailingly accepted as the seismic fault of the Tangshan earthquake. Moreover, the former seems to be a normal fault, while the latter is regarded as a strike-slip one.
