查看更多>>摘要：Through studying eighteen trenches along the Haiyuan fault, ten paleoearthquakes since ten thousand years ago were determined. The paleoearthquakes have different rupture scales. The first and the last events were the rupturing along the entire fault, while the rest of them along the secondary segments of the fault. Temporally, the paleoearthquakes distributions are not uniform so that they are characterized by clustering and having back and forth spatially from the west to middle -east segment of the fault. The magnitude of earthquakes along the entire ruptured fault is about 8.5 and of those along the secondary ruptured segments is about 7.5.
查看更多>>摘要：A continental sedimentary sequence of large thickness from Oligocene to Pleistocene is well developed in the Kumkal basin, Xinjiang, which recorded the process and scale of the uplift of the west part of the Qinghai-Tibetan Plateau. The main leveling plane was formed after Miocene but before Pliocene, a period featuring a change of biotic association from species like the ones in the present mountainous regions of South China to those suitable to salt-water environment. Geological data indicate that the scale of the uplift was fairly large and the horizontal movement was very strong in the western plateau. The features of mammal fossils in combination with the elevation of fossil beds and the characters of river erosion geomorphic features disclose that the uplift scale in this area is no inore than 500 m since the late Pleistocene.
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